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Straw residue amendment and fertilization are the key global management strategies for achieving more sustainable agriculture. However, the temporal changes in labile soil organic carbon (SOC) fractions and microbial community (MB) in response to differential long-term fertilization during straw residue decomposition remain unclear. We collected topsoil samples (0–20 cm; Mollisols) from three fertilizer management strategies (CK, no fertilization control, IF, inorganic fertilizer, and IFM, inorganic fertilizer plus manure) in a long-term field experiment. Subsequently, we conducted an in-situ micro-plot incubation experiment with and without 13C-labeled maize straw residue (δ13C = 246.9‰). We found that the straw-residue C in soil was mainly retained as particulate organic carbon (POC). The residue-derived POC was significantly increased, by 3, 5, and 20 times, whereas the residue-derived dissolved organic carbon (DOC) was significantly decreased by 71 %, 57 %, and 95 % in CK, IF, and IFM treatments, respectively, with straw addition (abbreviated as CKS, IFS, and IFMS respectively) during straw residue decomposition. The content of residue-derived microbial biomass carbon (MBC) was higher at 40.6 mg kg−1 (IFMS) and 33.0 mg kg−1 (IFS) compared to 27.0 mg kg−1 in the unfertilized (CKS) treatment at the end of the incubation period (day 150). The number of edges of the bacterial network was decreased by 16 %, 53 %, and 73 % in the treatments of CKS, IFS, and IFMS, respectively, compared with the corresponding fertilizer treatments without straw application. While the number of edges of fungal network also decreased by 57 % in CKS treatment, those in IFS and IFMS treatments increased by 160 % and 310 %, respectively. This indicated that straw residue addition decreases the bacterial microbial network complexity in all treatments, but it increases fungal network complexity in IFS and IFMS treatments. The highest microbial activities of the bacterial and fungal keystone taxa were observed on the 1 st day in the IFS treatment and on the 150th day in the CKS treatment. However, the highest microbial activities of bacterial keystone taxa were observed on the 60th day, and the highest microbial activities of fungal keystone taxa were detected on the 150th day in the IFMS treatment. The observed temporal changes in the microbial community suggested that independent of agricultural fertilizer management, straw residue-derived POC and DOC promoted fungal C processing, whereas for bacterial C, this was facilitated only by straw residue-derived MBC in these Mollisols. Highlighting straw residue incorporation helps to sustain microbial diversity and associated carbon processing in agricultural soils.
Zhuang Ge; Shuangyi Li; Roland Bol; Ping Zhu; Chang Peng; Tingting An; Na Cheng; Xu Liu; Tingyu Li; Zhiqiang Xu; Jingkuan Wang. Differential long-term fertilization alters residue-derived labile organic carbon fractions and microbial community during straw residue decomposition. Soil and Tillage Research 2021, 213, 105120 .
AMA StyleZhuang Ge, Shuangyi Li, Roland Bol, Ping Zhu, Chang Peng, Tingting An, Na Cheng, Xu Liu, Tingyu Li, Zhiqiang Xu, Jingkuan Wang. Differential long-term fertilization alters residue-derived labile organic carbon fractions and microbial community during straw residue decomposition. Soil and Tillage Research. 2021; 213 ():105120.
Chicago/Turabian StyleZhuang Ge; Shuangyi Li; Roland Bol; Ping Zhu; Chang Peng; Tingting An; Na Cheng; Xu Liu; Tingyu Li; Zhiqiang Xu; Jingkuan Wang. 2021. "Differential long-term fertilization alters residue-derived labile organic carbon fractions and microbial community during straw residue decomposition." Soil and Tillage Research 213, no. : 105120.
The goal of this work was to develop polymer-based heterocycle for water purification from toxic pesticides such as difenoconazole. The polymer chosen for this purpose was cellulose nanocrystalline (CNC); two cellulose based heterocycles were prepared by crosslinking with 2,6-pyridine dicarbonyl dichloride (Cell-X), and derivatizing with 2-furan carbonyl chloride (Cell-D). The synthesized cellulose-based heterocycles were characterized by SEM, proton NMR, TGA and FT-IR spectroscopy. To optimize adsorption conditions, the effect of various variable such as time, adsorbent dose, pH, temperature, and difenoconazole initial concentration were evaluated. Results showed that, the maximum difenoconazole removal percentage was about 94.7%, and 96.6% for Cell-X and Cell-D, respectively. Kinetic and thermodynamic studies on the adsorption process showed that the adsorption of difenoconazole by the two polymers is a pseudo-second order and follows the Langmuir isotherm model. The obtained values of ∆G ° and ∆H suggest that the adsorption process is spontaneous at room temperature. The results showed that Cell-X could be a promising adsorbent on a commercial scale for difenoconazole. The several adsorption sites present in Cell-X in addition to the semi crown ether structure explains the high efficiency it has for difenoconazole, and could be used for other toxic pesticides. Monte Carlo (MC) and Molecular Dynamic (MD) simulation were performed on a model of Cell-X and difenoconazole, and the results showed strong interaction.
Bayan Khalaf; Othman Hamed; Shehdeh Jodeh; Roland Bol; Ghadir Hanbali; Zaki Safi; Omar Dagdag; Avni Berisha; Subhi Samhan. Cellulose-Based Hectocycle Nanopolymers: Synthesis, Molecular Docking and Adsorption of Difenoconazole from Aqueous Medium. International Journal of Molecular Sciences 2021, 22, 6090 .
AMA StyleBayan Khalaf, Othman Hamed, Shehdeh Jodeh, Roland Bol, Ghadir Hanbali, Zaki Safi, Omar Dagdag, Avni Berisha, Subhi Samhan. Cellulose-Based Hectocycle Nanopolymers: Synthesis, Molecular Docking and Adsorption of Difenoconazole from Aqueous Medium. International Journal of Molecular Sciences. 2021; 22 (11):6090.
Chicago/Turabian StyleBayan Khalaf; Othman Hamed; Shehdeh Jodeh; Roland Bol; Ghadir Hanbali; Zaki Safi; Omar Dagdag; Avni Berisha; Subhi Samhan. 2021. "Cellulose-Based Hectocycle Nanopolymers: Synthesis, Molecular Docking and Adsorption of Difenoconazole from Aqueous Medium." International Journal of Molecular Sciences 22, no. 11: 6090.
Climate change affects the occurrence of high-discharge (HD) events and associated nutrient exports in catchment stream water. Information on colloidal events-based losses of important nutrients, such as organic C(Corg), N, P, and S, remain relatively scarce. We hypothesized that contributions of colloidal exported N, S, and P due to differing hydrological mechanisms vary between HD events in late winter and spring. We examined one combined snowmelt and rainfall event (March 2018) with one rainfall event (May 2018) for temporal Corg, N, P, and S dynamics. The catchment exports of colloids and their subset nanoparticles were analyzed by asymmetric-flow field flow fractionation (P) and a filtration cascade (N and S). The Corg source in both events was assessed by δ13C composition of the stream water in relation to that of the soil. In winter, 0.1 μm), but this was 29–64% in spring and was associated with Corg, Fe, and Al. Colloidal N and particulate S (>1 μm) were higher during both events, but the majority of losses were dissolved (<0.1 μm). The δ13C values of dissolved organic matter (13CDOM) showed that in winter, most Corg was exported from the hydrologically connected hillslopes by water flowing through mineral horizons, due to snowmelt. During and after the rainfall events, export from organic horizons dominated the nutrient losses as particulates, including colloids. These events highlight the need for a better quantification of often underreported particulate, colloid, and nanoparticle contributions to weather-driven nutrient losses from catchments.
Dymphie J. Burger; Johnny Vogel; Annemieke M. Kooijman; Roland Bol; Eva de Rijke; Jorien Schoorl; Andreas Lücke; Nina Gottselig. Colloidal catchment response to snowmelt and precipitation events differs in a forested headwater catchment. Vadose Zone Journal 2021, 20, e20126 .
AMA StyleDymphie J. Burger, Johnny Vogel, Annemieke M. Kooijman, Roland Bol, Eva de Rijke, Jorien Schoorl, Andreas Lücke, Nina Gottselig. Colloidal catchment response to snowmelt and precipitation events differs in a forested headwater catchment. Vadose Zone Journal. 2021; 20 (3):e20126.
Chicago/Turabian StyleDymphie J. Burger; Johnny Vogel; Annemieke M. Kooijman; Roland Bol; Eva de Rijke; Jorien Schoorl; Andreas Lücke; Nina Gottselig. 2021. "Colloidal catchment response to snowmelt and precipitation events differs in a forested headwater catchment." Vadose Zone Journal 20, no. 3: e20126.
Nano and colloidal particles (1–1000 nm) play important roles in phosphorus (P) migration and loss from agricultural soils; however, little is known about their relative distribution in arable crop soils under varying agricultural geolandscapes at the regional scale. Surface soils (0–20 cm depth) were collected from 15 agricultural fields, including two sites with different carbon input strategies, in Zhejiang Province, China, and water-dispersible nanocolloids (0.6–25 nm), fine colloids (25–160 nm), and medium colloids (160–500 nm) were separated and analyzed using the asymmetrical flow field flow fractionation technique. Three levels of fine-colloidal P content (3583–6142, 859–2612, and 514–653 μg kg–1) were identified at the regional scale. The nanocolloidal fraction correlated with organic carbon (Corg) and calcium (Ca), and the fine colloidal fraction with Corg, silicon (Si), aluminum (Al), and iron (Fe). Significant linear relationships existed between colloidal P and Corg, Si, Al, Fe, and Ca and for nanocolloidal P with Ca. The organic carbon controlled colloidal P saturation, which in turn affected the P carrier ability of colloids. Field-scale organic carbon inputs did not change the overall morphological trends in size fractions of water-dispersible colloids. However, they significantly affected the peak concentration in each of the nano-, fine-, and medium-colloidal P fractions. Application of chemical fertilizer with carbon-based solid manure and/or modified biochar reduced the soil nano-, fine-, and medium-colloidal P content by 30–40%; however,the application of chemical fertilizer with biogas slurry boosted colloidal P formation. This study provides a deep and novel understanding of the forms and composition of colloidal P in agricultural soils and highlights their spatial regulation by soil characteristics and carbon inputs.
Fayong Li; Qian Zhang; Erwin Klumpp; Roland Bol; Volker Nischwitz; Zhuang Ge; Xinqiang Liang. Organic Carbon Linkage with Soil Colloidal Phosphorus at Regional and Field Scales: Insights from Size Fractionation of Fine Particles. Environmental Science & Technology 2021, 55, 5815 -5825.
AMA StyleFayong Li, Qian Zhang, Erwin Klumpp, Roland Bol, Volker Nischwitz, Zhuang Ge, Xinqiang Liang. Organic Carbon Linkage with Soil Colloidal Phosphorus at Regional and Field Scales: Insights from Size Fractionation of Fine Particles. Environmental Science & Technology. 2021; 55 (9):5815-5825.
Chicago/Turabian StyleFayong Li; Qian Zhang; Erwin Klumpp; Roland Bol; Volker Nischwitz; Zhuang Ge; Xinqiang Liang. 2021. "Organic Carbon Linkage with Soil Colloidal Phosphorus at Regional and Field Scales: Insights from Size Fractionation of Fine Particles." Environmental Science & Technology 55, no. 9: 5815-5825.
The hyperarid soils of the Atacama Desert, Chile, contain the largest known nitrate deposits in the world. They also represent one of the most hostile environments for microbial life anywhere in the terrestrial biosphere. Despite known for its extreme dryness, several heavy rainfall events causing localised flash flooding have struck Atacama Desert core regions during the last five years. It remains unclear, however, whether these soils can support microbial denitrification. To answer this, we sampled soils along a hyperaridity gradient in the Atacama Desert and conducted incubation experiments using a robotized continuous flow system under a He/O2 atmosphere. The impacts of four successive extreme weather events on soil-borne N2O and N2 emissions were investigated, i) water addition, ii) NO3− addition, iii) labile carbon (C) addition, and iv) oxygen depletion. The 15N–N2O site-preference (SP) approach was further used to examine the source of N2O produced. Extremely low N2O fluxes were detected shortly after water and NO3− addition, whereas pronounced N2O and N2 emissions were recorded after labile-C (glucose) amendment in all soils. Under anoxia, N2 emissions increased drastically while N2O emissions decreased concomitantly, indicating the potential for complete denitrification at all sites. Although increasing aridity significantly reduced soil bacterial richness, microbial potential for denitrification and associated gene abundance (i.e., napA, narG, nirS, nirK, cnorB, qnorB and nosZ) was not affected. The N2O15N site preference values based on two end-member model suggested that fungal and bacterial denitrification co-contributed to N2O production in less arid sites, whereas bacterial denitrification dominated with increasing aridity. We conclude that soil denitrification functionality is preserved even with lowered microbial richness in the extreme hyperarid Atacama Desert. Future changes in land-use or extreme climate events therefore have a potential to destabilize the immense reserves of nitrate and induce significant N2O losses in the region.
Di Wu; Mehmet Senbayram; Ghazal Moradi; Ramona Mörchen; Claudia Knief; Erwin Klumpp; Davey L. Jones; Reinhard Well; Ruirui Chen; Roland Bol. Microbial potential for denitrification in the hyperarid Atacama Desert soils. Soil Biology and Biochemistry 2021, 157, 108248 .
AMA StyleDi Wu, Mehmet Senbayram, Ghazal Moradi, Ramona Mörchen, Claudia Knief, Erwin Klumpp, Davey L. Jones, Reinhard Well, Ruirui Chen, Roland Bol. Microbial potential for denitrification in the hyperarid Atacama Desert soils. Soil Biology and Biochemistry. 2021; 157 ():108248.
Chicago/Turabian StyleDi Wu; Mehmet Senbayram; Ghazal Moradi; Ramona Mörchen; Claudia Knief; Erwin Klumpp; Davey L. Jones; Reinhard Well; Ruirui Chen; Roland Bol. 2021. "Microbial potential for denitrification in the hyperarid Atacama Desert soils." Soil Biology and Biochemistry 157, no. : 108248.
Engineered nanoparticles (ENPs) present in consumer products are being released into the agricultural systems. There is little information about the direct effect of ENPs on phosphorus (P) availability, which is an essential nutrient for crop growth naturally occurring in agricultural soils. The present study examined the effect of 1, 3, and 5% doses of Cu0 or Ag0 ENPs stabilized with L-ascorbic acid (suspension pH 2–3) on P ad- and desorption in an agricultural Andisol with total organic matter (T-OM) and with partial removal of organic matter (R-OM) by performing batch experiments. Our results showed that the adsorption kinetics data of H2PO4 − on T-OM and R-OM soil samples with and without ENPs were adequately described by the pseudo-second-order (PSO) and Elovich models. The adsorption isotherm data of H2PO4 − from T-OM and R-OM soil samples following ENPs addition were better fitted by the Langmuir model than the Freundlich model. When the Cu0 or Ag0 ENPs doses were increased, the pH value decreased and H2PO4 − adsorption increased on T-OM and R-OM. The H2PO4 − desorption (%) was lower with Cu0 ENPs than Ag0 ENPs. Overall, the incorporation of ENPs into Andisols generated an increase in P retention, which may affect agricultural crop production.
Jonathan Suazo-Hernández; Erwin Klumpp; Nicolás Arancibia-Miranda; Patricia Poblete-Grant; Alejandra Jara; Roland Bol; María De La Luz Mora. Describing Phosphorus Sorption Processes on Volcanic Soil in the Presence of Copper or Silver Engineered Nanoparticles. Minerals 2021, 11, 373 .
AMA StyleJonathan Suazo-Hernández, Erwin Klumpp, Nicolás Arancibia-Miranda, Patricia Poblete-Grant, Alejandra Jara, Roland Bol, María De La Luz Mora. Describing Phosphorus Sorption Processes on Volcanic Soil in the Presence of Copper or Silver Engineered Nanoparticles. Minerals. 2021; 11 (4):373.
Chicago/Turabian StyleJonathan Suazo-Hernández; Erwin Klumpp; Nicolás Arancibia-Miranda; Patricia Poblete-Grant; Alejandra Jara; Roland Bol; María De La Luz Mora. 2021. "Describing Phosphorus Sorption Processes on Volcanic Soil in the Presence of Copper or Silver Engineered Nanoparticles." Minerals 11, no. 4: 373.
Excess of water irrigation and fertilizer consumption by crops has resulted in high soil nitrogen (N) losses and underground water contamination not only in China but worldwide. This study explored the effects of soil N input, soil N output, as well as the effect of different irrigation and N- fertilizer managements on residual N. For this, two consecutive years of winter wheat (Triticum aestivum L.) –summer maize (Zea mays L.) rotation was conducted with: N applied at 0 kg N ha−1 yr−1, 420 kg N ha−1 yr−1 and 600 kg N ha−1 yr−1 under fertigation (DN0, DN420, DN600), and N applied at 0 kg N ha−1 yr−1 and 600 kg N ha−1 yr−1 under flood irrigation (FN0, FN600). The results demonstrated that low irrigation water consumption resulted in a 57.2% lower of irrigation-N input (p < 0.05) in DN600 when compared to FN600, especially in a rainy year like 2015–2016. For N output, no significant difference was found with all N treatments. Soil gaseous N losses were highly correlated with fertilization (p < 0.001) and were reduced by 23.6%–41.7% when fertilizer N was decreased by 30%. Soil N leaching was highly affected by irrigation and a higher reduction was observed under saving irrigation (reduced by 33.9%–57.3%) than under optimized fertilization (reduced by 23.6%–50.7%). The net N surplus was significantly increased with N application rate but was not affected by irrigation treatments. Under the same N level (600 kg N ha−1 yr−1), fertigation increased the Total Nitrogen (TN) stock by 17.5% (0–100 cm) as compared to flood irrigation. These results highlighted the importance to further reduction of soil N losses under optimized fertilization and irrigation combined with N stabilizers or balanced- N fertilization for future agriculture development.
Xin Zhang; Guangmin Xiao; Roland Bol; Ligang Wang; Yuping Zhuge; Wenliang Wu; Hu Li; Fanqiao Meng. Influences of irrigation and fertilization on soil N cycle and losses from wheat–maize cropping system in northern China. Environmental Pollution 2021, 278, 116852 .
AMA StyleXin Zhang, Guangmin Xiao, Roland Bol, Ligang Wang, Yuping Zhuge, Wenliang Wu, Hu Li, Fanqiao Meng. Influences of irrigation and fertilization on soil N cycle and losses from wheat–maize cropping system in northern China. Environmental Pollution. 2021; 278 ():116852.
Chicago/Turabian StyleXin Zhang; Guangmin Xiao; Roland Bol; Ligang Wang; Yuping Zhuge; Wenliang Wu; Hu Li; Fanqiao Meng. 2021. "Influences of irrigation and fertilization on soil N cycle and losses from wheat–maize cropping system in northern China." Environmental Pollution 278, no. : 116852.
1 Abstract In this study, we developed a novel model approach to compute the spatio-temporal distribution patterns of rhizodeposits around growing root systems in three dimensions. This model approach allows us for the first time to study the evolution of rhizodeposition patterns around complex three-dimensional root systems. Root systems were generated using the root architecture model CPlantBox. The concentration of rhizodeposits at a given location in the soil domain was computed analytically. To simulate the spread of rhizodeposits in the soil, we considered rhizodeposit release from the roots, rhizodeposit diffusion into the soil, rhizodeposit sorption to soil particles, and rhizodeposit degradation by microorganisms. To demonstrate the capabilities of our new model approach, we performed simulations for the two example rhizodeposits mucilage and cit-rate and the example root system Vicia faba. The rhizodeposition model was parameterized using values from the literature. Our simulations showed that the rhizosphere soil volume with rhizodeposit concentrations above a defined threshold value (i.e., the rhizodeposit hotspot volume), exhibited a maximum at intermediate root growth rates. Root branching allowed the rhizospheres of individual roots to overlap, resulting in a greater volume of rhizodeposit hotspots. This was particularly important in the case of citrate, where overlap of rhizodeposition zones accounted for more than half of the total rhizodeposit hotspot volumes. Coupling a root architecture model with a rhizodeposition model allowed us to get a better understanding of the influence of root architecture as well as rhizodeposit properties on the evolution of the spatio-temporal distribution patterns of rhizodeposits around growing root systems.
Magdalena Landl; Adrian Haupenthal; Daniel Leitner; Eva Kroener; Doris Vetterlein; Roland Bol; Harry Vereecken; Jan Vanderborght; Andrea Schnepf. Simulating rhizodeposition patterns around growing and exuding root systems. 2021, 1 .
AMA StyleMagdalena Landl, Adrian Haupenthal, Daniel Leitner, Eva Kroener, Doris Vetterlein, Roland Bol, Harry Vereecken, Jan Vanderborght, Andrea Schnepf. Simulating rhizodeposition patterns around growing and exuding root systems. . 2021; ():1.
Chicago/Turabian StyleMagdalena Landl; Adrian Haupenthal; Daniel Leitner; Eva Kroener; Doris Vetterlein; Roland Bol; Harry Vereecken; Jan Vanderborght; Andrea Schnepf. 2021. "Simulating rhizodeposition patterns around growing and exuding root systems." , no. : 1.
Currently, China has approximately four million hectares of intensively cultivated plastic-shed vegetable production, i.e., with excessive nitrogen (N) fertilization and high irrigation. Plastic-shed vegetable production has helped meet the rapidly increasing consumer demand for fresh vegetables while improving heat, light, and land utilization efficiencies, resulting in very high vegetable yield. We collected all studies from the 1980s to 2020 on N2O emissions and N fertilization associated with plastic-shed vegetable production at 40 field sites in China. Fertilizer N utilization efficiencies and N2O emissions that were affected by fertilizer N rate and type, irrigation, growth duration, nitrification inhibitors, and soil properties were systematically examined. The results revealed that fertilizer N efficiencies in plastic-shed vegetable production significantly decreased with increasing N fertilization rate. The average N recovery efficiency (REN) and apparent N use efficiency (ANUE) were 6.8 % and 33 %, respectively; much lower than those of cereal crop production in the same region. In fruit and leafy vegetable production, N2O emissions exhibited an exponential and linear relationship with the fertilizer N rate, respectively, and the average contributions of fertilizer N to N2O emissions were 68 % and 70 %, respectively. Compared with synthetic N fertilizer or manure alone, combination of synthetic fertilizer with animal manure significantly increased the N2O emissions and emission factors (EFs) at high N fertilization rates (>800 kg N ha−1 season−1), but there were no significant differences among fertilizer types at N rate 30 g kg−1), growth period of >100 d, and higher irrigation increased the responses of N2O emission to N fertilization. As plastic-shed soils are continuously and intensively farmed, soil properties will be negatively affected, and should be considered together with fertilization and irrigation to maintain high vegetable yield and low N2O emissions. Our study highlighted that the exponential relationship was more appropriate to predict the N2O emissions in plastic-shed vegetable production, and our findings help to optimize fertilizer N input with consideration of crop yield and greenhouse gas emission.
Bang Ni; Wei Zhang; Xiuchun Xu; Ligang Wang; Roland Bol; Kaiyong Wang; Zhengjiang Hu; Haixia Zhang; Fanqiao Meng. Exponential relationship between N2O emission and fertilizer nitrogen input and mechanisms for improving fertilizer nitrogen efficiency under intensive plastic-shed vegetable production in China: A systematic analysis. Agriculture, Ecosystems & Environment 2021, 312, 107353 .
AMA StyleBang Ni, Wei Zhang, Xiuchun Xu, Ligang Wang, Roland Bol, Kaiyong Wang, Zhengjiang Hu, Haixia Zhang, Fanqiao Meng. Exponential relationship between N2O emission and fertilizer nitrogen input and mechanisms for improving fertilizer nitrogen efficiency under intensive plastic-shed vegetable production in China: A systematic analysis. Agriculture, Ecosystems & Environment. 2021; 312 ():107353.
Chicago/Turabian StyleBang Ni; Wei Zhang; Xiuchun Xu; Ligang Wang; Roland Bol; Kaiyong Wang; Zhengjiang Hu; Haixia Zhang; Fanqiao Meng. 2021. "Exponential relationship between N2O emission and fertilizer nitrogen input and mechanisms for improving fertilizer nitrogen efficiency under intensive plastic-shed vegetable production in China: A systematic analysis." Agriculture, Ecosystems & Environment 312, no. : 107353.
In this study, cellulose-based derivatives with heterocyclic moieties were synthesized by reacting cellulose with furan-2-carbonyl chloride (Cell-F) and pyridine-2,6-dicarbonyl dichloride (Cell-P). The derivatives were evaluated as adsorbents for the pesticide tetraconazole from aqueous solution. The prepared adsorbents were characterized by SEM, TGA, IR, and H1 NMR instruments. To maximize the adsorption efficiency of tetraconazole, the optimum conditions of contact time, pH, temperature, adsorbent dose, and initial concentration of adsorbate were determined. The highest removal percentage of tetraconazole from water was 98.51% and 95% using Cell-F and Cell-P, respectively. Underivatized nanocellulose was also evaluated as an adsorbent for tetraconazole for comparison purpose, and it showed a removal efficiency of about 91.73%. The best equilibrium adsorption isotherm model of each process was investigated based on the experimental and calculated R2 values of Freundlich and Langmuir models. The adsorption kinetics were also investigated using pseudo-first-order, pseudo-second-order, and intra-particle-diffusion adsorption kinetic models. The Van’t Hoff plot was also studied for each adsorption to determine the changes in adsorption enthalpy (∆H), Gibbs free energy (∆G), and entropy (∆S). The obtained results showed that adsorption by Cell-F and Cell-P follow the Langmuir adsorption isotherm and the mechanism follows the pseudo-second-order kinetic adsorption model. The obtained negative values of the thermodynamic parameter ∆G (−4.693, −4.792, −5.549 kJ) for nanocellulose, Cell-F, and Cell-P, respectively, indicate a spontaneous adsorption process. Cell-F and Cell-P could be promising absorbents on a commercial scale for tetraconazole and other pesticides.
Bayan Khalaf; Othman Hamed; Shehdeh Jodeh; Ghadir Hanbali; Roland Bol; Omar Dagdag; Subhi Samhan. Novel, Environment-Friendly Cellulose-Based Derivatives for Tetraconazole Removal from Aqueous Solution. Polymers 2021, 13, 450 .
AMA StyleBayan Khalaf, Othman Hamed, Shehdeh Jodeh, Ghadir Hanbali, Roland Bol, Omar Dagdag, Subhi Samhan. Novel, Environment-Friendly Cellulose-Based Derivatives for Tetraconazole Removal from Aqueous Solution. Polymers. 2021; 13 (3):450.
Chicago/Turabian StyleBayan Khalaf; Othman Hamed; Shehdeh Jodeh; Ghadir Hanbali; Roland Bol; Omar Dagdag; Subhi Samhan. 2021. "Novel, Environment-Friendly Cellulose-Based Derivatives for Tetraconazole Removal from Aqueous Solution." Polymers 13, no. 3: 450.
Peatlands comprise major global stocks of soil organic carbon (SOC). Many degraded peatlands are currently being restored, but little is known to which degree former disturbances leave a ‘legacy’ in such restored peatlands, and subsequently how this impacts their response to global change. Our aims were to investigate if after 20 years of restoration (i) carbon stability may still be affected by the former land use and if (ii) restored bogs are less susceptible to nutrient input but (iii) more sensitive to temperature rise. We sampled the top- and subsoil of a formerly drained, a previously drained and afforested part and an unmanaged control site of a Scottish bog. We incubated peat from each part for determination of potential basal respiration, nutrient limitation and temperature sensitivity (Q10) of aerobic peat degradation. Lowest respiration rates were identified at the afforested site while nutrient addition had no significant effect on topsoil organic matter decomposition at all sites. Q10 values were significantly higher in the topsoil (2.6 ± 0.3 to 2.8 ± 0.2) than in the subsoil. For the subsoil, the drained site (2.0 ± 0.0) showed significantly lower Q10 values than the afforested one (2.6 ± 0.6), while the control site had a Q10 of 2.1 ± 0.0, indicating contrasting temperature sensitivities of potential SOC losses following specific forms of disturbance. Overall, our data indicate that afforestation left a legacy on potential subsoil SOC losses with global warming. Such effects must be considered when integrating restored bogs into global data bases on peatlands' responses to global change.
Heike Schimmel; Melanie Braun; Jens-Arne Subke; Wulf Amelung; Roland Bol. Carbon stability in a Scottish lowland raised bog: potential legacy effects of historical land use and implications for global change. Soil Biology and Biochemistry 2021, 154, 108124 .
AMA StyleHeike Schimmel, Melanie Braun, Jens-Arne Subke, Wulf Amelung, Roland Bol. Carbon stability in a Scottish lowland raised bog: potential legacy effects of historical land use and implications for global change. Soil Biology and Biochemistry. 2021; 154 ():108124.
Chicago/Turabian StyleHeike Schimmel; Melanie Braun; Jens-Arne Subke; Wulf Amelung; Roland Bol. 2021. "Carbon stability in a Scottish lowland raised bog: potential legacy effects of historical land use and implications for global change." Soil Biology and Biochemistry 154, no. : 108124.
Paul Trevorrow; Roland Bol. Meet the Editors ‐ Roland Bol. Rapid Communications in Mass Spectrometry 2020, 35, e9026 .
AMA StylePaul Trevorrow, Roland Bol. Meet the Editors ‐ Roland Bol. Rapid Communications in Mass Spectrometry. 2020; 35 (5):e9026.
Chicago/Turabian StylePaul Trevorrow; Roland Bol. 2020. "Meet the Editors ‐ Roland Bol." Rapid Communications in Mass Spectrometry 35, no. 5: e9026.
The natural measurements of uranium (U) are important for establishing natural baseline levels of U in soil. The relations between U and other elements are important to determine the extent of geological origin of soil U. The present study was aimed at providing a three-dimensional view of soil U distribution in a forested catchment (ca. 38.5 ha) in western Germany. The evaluated data, containing 155 sampled points, each with four major soil horizons (L/Of, Oh, A, and B), were collected from two existing datasets. The vertical U distribution, the lateral pattern of U in the catchment, and the occurrence of correlations between U and three groups of elements (nutrient elements, heavy metals, and rare earth elements) were examined. The results showed the median U concentration increased sevenfold from the top horizon L/Of (0.14 mg kg−1) to the B horizon (1.01 mg kg−1), suggesting a geogenic origin of soil U. Overall, soil U concentration was found to be negatively correlated with some plant macronutrients (C, N, K, S, Ca) but positively with others (P, Mg, Cu, Zn, Fe, Mn, Mo). The negative correlations between U and some macronutrients indicated a limited accumulation of plant-derived U in soil, possibly due to low phytoavailability of U. Positive correlations were also found between U concentration and heavy metals (Cr, Co, Ni, Ga, As, Cd, Hg, Pb) or rare earth elements, which further pointed to a geogenic origin of soil U in this forested catchment.
Yajie Sun; Bei Wu; Inge Wiekenkamp; Annemieke M. Kooijman; Roland Bol. Uranium Vertical and Lateral Distribution in a German Forested Catchment. Forests 2020, 11, 1351 .
AMA StyleYajie Sun, Bei Wu, Inge Wiekenkamp, Annemieke M. Kooijman, Roland Bol. Uranium Vertical and Lateral Distribution in a German Forested Catchment. Forests. 2020; 11 (12):1351.
Chicago/Turabian StyleYajie Sun; Bei Wu; Inge Wiekenkamp; Annemieke M. Kooijman; Roland Bol. 2020. "Uranium Vertical and Lateral Distribution in a German Forested Catchment." Forests 11, no. 12: 1351.
Sustainable soil carbon sequestration practices need to be rapidly scaled up and implemented to contribute to climate change mitigation. We highlight that the major potential for carbon sequestration is in cropland soils, especially those with large yield gaps and/or large historic soil organic carbon losses. The implementation of soil carbon sequestration measures requires a diverse set of options, each adapted to local soil conditions and management opportunities, and accounting for site-specific trade-offs. We propose the establishment of a soil information system containing localised information on soil group, degradation status, crop yield gap, and the associated carbon-sequestration potentials, as well as the provision of incentives and policies to translate management options into region- and soil-specific practices.
W. Amelung; D. Bossio; W. De Vries; I. Kögel-Knabner; J. Lehmann; R. Amundson; R. Bol; C. Collins; R. Lal; J. Leifeld; B. Minasny; G. Pan; K. Paustian; C. Rumpel; J. Sanderman; J. W. Van Groenigen; S. Mooney; B. Van Wesemael; M. Wander; A. Chabbi. Towards a global-scale soil climate mitigation strategy. Nature Communications 2020, 11, 1 -10.
AMA StyleW. Amelung, D. Bossio, W. De Vries, I. Kögel-Knabner, J. Lehmann, R. Amundson, R. Bol, C. Collins, R. Lal, J. Leifeld, B. Minasny, G. Pan, K. Paustian, C. Rumpel, J. Sanderman, J. W. Van Groenigen, S. Mooney, B. Van Wesemael, M. Wander, A. Chabbi. Towards a global-scale soil climate mitigation strategy. Nature Communications. 2020; 11 (1):1-10.
Chicago/Turabian StyleW. Amelung; D. Bossio; W. De Vries; I. Kögel-Knabner; J. Lehmann; R. Amundson; R. Bol; C. Collins; R. Lal; J. Leifeld; B. Minasny; G. Pan; K. Paustian; C. Rumpel; J. Sanderman; J. W. Van Groenigen; S. Mooney; B. Van Wesemael; M. Wander; A. Chabbi. 2020. "Towards a global-scale soil climate mitigation strategy." Nature Communications 11, no. 1: 1-10.
Water pollution is one of the major challenges facing modern society because of industrial development and urban growth. This study is directed towards assessing the use of multiwall carbon nanotube, after derivatization and magnetization, as a new and renewable absorbent, to remove toxic metal ions from waste streams. The adsorbents were prepared by, first oxidation of multiwall carbon nanotube, then derivatizing the oxidized product with hydroxyl amine, hydrazine and amino acid. The adsorbents were characterized by various techniques. The adsorption efficiency of the multiwall carbon nanotube adsorbents toward Pb(II) was investigated. The effect of adsorbent’s dose, temperature, pH, and time on the adsorption efficiency were studied and the adsorption parameters that gave the highest efficiency were determined. The derivatives have unique coordination sites that included amine, hydroxyl, and carboxyl groups, which are excellent chelating agents for metal ions. The thermodynamic and kinetic results analysis results indicated spontaneous adsorption of Pb(II) by the multiwall carbon nanotube adsorbents at room temperature. The adsorption process followed pseudo-second-order and Langmuir isotherm model. The adsorbents were regenerated using 0.1 N HCl.
Ghadir Hanbali; Shehdeh Jodeh; Othman Hamed; Roland Bol; Bayan Khalaf; Asma Qdemat; Subhi Samhan; Omar Dagdag. Magnetic Multiwall Carbon Nanotube Decorated with Novel Functionalities: Synthesis and Application as Adsorbents for Lead Removal from Aqueous Medium. Processes 2020, 8, 986 .
AMA StyleGhadir Hanbali, Shehdeh Jodeh, Othman Hamed, Roland Bol, Bayan Khalaf, Asma Qdemat, Subhi Samhan, Omar Dagdag. Magnetic Multiwall Carbon Nanotube Decorated with Novel Functionalities: Synthesis and Application as Adsorbents for Lead Removal from Aqueous Medium. Processes. 2020; 8 (8):986.
Chicago/Turabian StyleGhadir Hanbali; Shehdeh Jodeh; Othman Hamed; Roland Bol; Bayan Khalaf; Asma Qdemat; Subhi Samhan; Omar Dagdag. 2020. "Magnetic Multiwall Carbon Nanotube Decorated with Novel Functionalities: Synthesis and Application as Adsorbents for Lead Removal from Aqueous Medium." Processes 8, no. 8: 986.
In recent years, concerns have been raised about the occurrence of active raw materials and pharmaceutical ingredients that may be present in water, including wastewater, in the pharmaceutical industry. Wastewater treatment methods are not enough to completely remove active pharmaceuticals and other waste; thus, this study aims to assess the use of a multiwall carbon nanotube after derivatization and magnetization as a new and renewable absorbent for removing ibuprofen from an aqueous medium. The adsorbents were prepared by first oxidizing a multiwall carbon nanotube and then deriving the oxidized product with hydroxyl amine (m-MWCNT–HA), hydrazine (m-MWCNT–HYD), and amino acid (m-MWCNT–CYS). Adsorbents were characterized by Raman spectroscopy, Fourier Transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM and TEM), Brunauer–Emmett–Teller surface area analysis (BET), thermogravimetric analysis (TGA), and vibrating sample magnetometer (VSM). Batch adsorption studies were conducted to study the effects of pH, temperature, time, and initial concentration of the adsorbate. Adsorption isotherm, kinetics, and thermodynamics studies were also conducted. The results show that the optimal pH for nearly complete removal of Ibu in a short time at room temperature was 4 for three adsorbents. The adsorption followed the Langmuir isotherm model with pseudo-second-order kinetics. The percentage of removal of ibuprofen reached up to 98.4%, 93%, and 61.5% for m-MWCNT–CYS, m-MWCNT–HYD, and m-MWCNT–HA respectively. To the best of our knowledge, the grafted MWCNTs presented in this work comprise the first example in the literature of oxidized MWCNT modified with such functionalities and applied for ibuprofen removal.
Ghadir Hanbali; Shehdeh Jodeh; Othman Hamed; Roland Bol; Bayan Khalaf; Asma Qdemat; Subhi Samhan. Enhanced Ibuprofen Adsorption and Desorption on Synthesized Functionalized Magnetic Multiwall Carbon Nanotubes from Aqueous Solution. Materials 2020, 13, 3329 .
AMA StyleGhadir Hanbali, Shehdeh Jodeh, Othman Hamed, Roland Bol, Bayan Khalaf, Asma Qdemat, Subhi Samhan. Enhanced Ibuprofen Adsorption and Desorption on Synthesized Functionalized Magnetic Multiwall Carbon Nanotubes from Aqueous Solution. Materials. 2020; 13 (15):3329.
Chicago/Turabian StyleGhadir Hanbali; Shehdeh Jodeh; Othman Hamed; Roland Bol; Bayan Khalaf; Asma Qdemat; Subhi Samhan. 2020. "Enhanced Ibuprofen Adsorption and Desorption on Synthesized Functionalized Magnetic Multiwall Carbon Nanotubes from Aqueous Solution." Materials 13, no. 15: 3329.
Litter decomposition plays a critical role in regulating biogeochemical cycles in terrestrial ecosystems and is profoundly impacted by increasing atmospheric nitrogen (N) deposition. Here, a N manipulation experiment was conducted to explore the effects of N additions (0 kg N ha−1 yr−1, 20 kg N ha−1 yr−1 and 40 kg N ha−1 yr−1) on decay rates and nutrients release of two contrasting species, the evergreen and nutrient-poor Michelia wilsonii and the deciduous and nutrient-rich Camptotheca acuminata, using a litterbag approach at the western edge of the Sichuan Basin of China. The decay rate and the mineralization of N and phosphorus (P) was faster in nutrient-rich C. acuminata litter than in nutrient-poor M. wilsonii litter, regardless of N regimes. N additions tended to decrease the decay constant (k value) in M. wilsonii litter, but had no effect on C. acuminata litter. N additions had no significant effects on carbon (C) release of both litter types. N additions showed negative effects on N and P release of M. wilsonii litter, particularly in the late decomposition stage. Moreover, for C. acuminata litter, N additions did not affect N release, but retarded P release in the late stage. N additions did not affect the C:N ratio in both litter types. However, N additions—especially high-N addition treatments—tended to reduce C:P and N:P ratios in both species. The effect of N addition on N and P remaining was stronger in M. wilsonii litter than in C. acuminata litter. The results of this study indicate that N additions retarded the nutrients release of two foliar litters. Thus, rising N deposition might favor the retention of N and P via litter decomposition in this specific area experiencing significant N deposition.
Liyan Zhuang; Qun Liu; Ziyi Liang; Chengming You; Bo Tan; Li Zhang; Rui Yin; Kaijun Yang; Roland Bol; Zhenfeng Xu. Nitrogen Additions Retard Nutrient Release from Two Contrasting Foliar Litters in a Subtropical Forest, Southwest China. Forests 2020, 11, 377 .
AMA StyleLiyan Zhuang, Qun Liu, Ziyi Liang, Chengming You, Bo Tan, Li Zhang, Rui Yin, Kaijun Yang, Roland Bol, Zhenfeng Xu. Nitrogen Additions Retard Nutrient Release from Two Contrasting Foliar Litters in a Subtropical Forest, Southwest China. Forests. 2020; 11 (4):377.
Chicago/Turabian StyleLiyan Zhuang; Qun Liu; Ziyi Liang; Chengming You; Bo Tan; Li Zhang; Rui Yin; Kaijun Yang; Roland Bol; Zhenfeng Xu. 2020. "Nitrogen Additions Retard Nutrient Release from Two Contrasting Foliar Litters in a Subtropical Forest, Southwest China." Forests 11, no. 4: 377.
Rice paddy soils are known to represent a large proportion of global terrestrial carbon (C) stocks (ca.10 Pg), accumulating organic C in the topsoil due to cultivation under submerged conditions. Apart from the limited mineralization under anoxic soil conditions resulting from frequent field flooding, other mechanisms involving the dynamic interactions between organic C and redox-active minerals particularly Fe (oxy)hydroxides, together with the transport of organic C to deep mineral horizons, can lead to long-term C stabilization. Our previous studies have shown that up to 30-50 g m-2 of dissolved organic C (DOC, defined as <450 nm) and 25-40 g m-2 of Fe2+ may be mobilized and translocated into the subsoil over a rice cropping season in temperate rice paddies, contributing to an increase in belowground C stocks. However, little is yet know on influence of frequent redox fluctuations on the contribution of colloidal organo-mineral associations to C mobilization and accrual in paddy subsoils.
We hypothesized that (i) redox fluctuations may lead to an overall increase in colloid dispersion (via reductive dissolution of Fe oxides, changes in soil pH, as well as neoformation of colloidal organo-mineral associations), and that (ii) colloidal mobility may represent an important C input to paddy subsoils. In order to evaluate the effects of redox fluctuations on colloid dynamics in situ, water-dispersible fine colloids (WDFC) were isolated from soils collected from different horizons along two profiles opened in adjacent plots under long-term paddy (P) and non-paddy (NP) management in NW Italy. Moreover, WDFC were also isolated from anaerobically-incubated topsoil samples to evaluate the changes in colloid dispersion under reducing conditions as a function of management. Colloidal size-fractionation and their elemental compositions were evaluated by asymmetric flow field-flow fractionation (AF4) coupled with OCD or ICP-MS.
Our results evidenced that redox cycling favours colloidal stability in the topsoils, with a preferential dispersion of the smallest-sized colloidal C (<30 nm and 30-240 nm fractions), even though larger-sized colloidal C (>240 nm) contributes predominantly to the WDFC. Consequently, under long-term paddy management colloidal dispersion and transport along the soil profile were probably responsible for the lower amounts of colloidal C (and Fe) observed in the Ap topsoil horizons of P with respect to NP, as well as for the significant accumulation of colloidal C in correspondence with the Brd subsoil horizons just beneath the plough pan. These illuvial horizons were also particularly rich in small-sized (30-240 nm) colloidal Fe, Al and Si possibly due to mineral phase changes induced by redox fluctuations.
Our findings therefore indicate that downward mobilization of colloidal C associated with Fe (hydr)oxides (e.g. coprecipitates) or small aluminosilicate minerals, rather than dissolved organic C, may represent an important process driving organic C accrual in paddy subsoils. However, further insights are still required to entangle the contribution of the different mechanisms involved.
Daniel Said-Pullicino; Beatrice Giannetta; Beatrice DeMeglio; Anna Missong; Nina Gottselig; Roland Bol; Erwin Klumpp; Luisella Celi. Redox-driven colloidal mobility and its effects on carbon cycling in temperate paddy soils. 2020, 1 .
AMA StyleDaniel Said-Pullicino, Beatrice Giannetta, Beatrice DeMeglio, Anna Missong, Nina Gottselig, Roland Bol, Erwin Klumpp, Luisella Celi. Redox-driven colloidal mobility and its effects on carbon cycling in temperate paddy soils. . 2020; ():1.
Chicago/Turabian StyleDaniel Said-Pullicino; Beatrice Giannetta; Beatrice DeMeglio; Anna Missong; Nina Gottselig; Roland Bol; Erwin Klumpp; Luisella Celi. 2020. "Redox-driven colloidal mobility and its effects on carbon cycling in temperate paddy soils." , no. : 1.
Phosphate rocks (PRs) used in fertilizer production contain uranium (U), which enters agricultural soils through phosphorus fertilization. However, our knowledge is still limited and cannot explain the different levels of U contamination found in agricultural systems. The paper reviewed the spatial and temporal U variations in PRs to obtain a comprehensive overview of U levels in various PRs worldwide and to investigate why U concentrations in igneous PRs are significantly lower compared to sedimentary PRs, and why less U is present in old sedimentary PRs (Precambrian-Cambrian) than in younger PRs (Ordovician-Neogene). In addition, the natural oxygen isotope compositions of phosphate (δ18Op) in various PRs were determined to identify their origins in relation to their U concentration. The δ18Op values differed among igneous PRs, old sedimentary PRs, and younger sedimentary PRs. Generally, the PRs with low δ18Op values had low U concentrations. In igneous PRs, low U concentrations were due to the lack of secondary U enrichment processes after rock formation, with low δ18Op values resulting from limited isotope fractionation at high temperature. Conversely, in sedimentary PRs, both U concentrations and δ18Op values were influenced by paleoclimate and paleogeographic features. Overall, there is a time-dependent coincidence of processes altering U concentration and δ18Op signatures of sedimentary PRs in a similar direction.
Y. Sun; W. Amelung; B. Wu; S. Haneklaus; M. Maekawa; A. Lücke; E. Schnug; R. Bol. ‘Co-evolution’ of uranium concentration and oxygen stable isotope in phosphate rocks. Applied Geochemistry 2019, 114, 104476 .
AMA StyleY. Sun, W. Amelung, B. Wu, S. Haneklaus, M. Maekawa, A. Lücke, E. Schnug, R. Bol. ‘Co-evolution’ of uranium concentration and oxygen stable isotope in phosphate rocks. Applied Geochemistry. 2019; 114 ():104476.
Chicago/Turabian StyleY. Sun; W. Amelung; B. Wu; S. Haneklaus; M. Maekawa; A. Lücke; E. Schnug; R. Bol. 2019. "‘Co-evolution’ of uranium concentration and oxygen stable isotope in phosphate rocks." Applied Geochemistry 114, no. : 104476.
Soil C and N turnover rates and contents are strongly influenced by climates (e.g., mean annual temperature MAT, and mean annual precipitation MAP) as well as human activities. However, the effects of converting natural forests to intensively human-managed plantations on soil carbon (C), nitrogen (N) dynamics across various climatic zones are not well known. In this study, we evaluated C, N pool and natural abundances of δ13C and δ15N in forest floor layer and 1-meter depth mineral soils under natural forests (NF) and plantation forest (PF) at six sites in eastern China. Our results showed that forest floor had higher C contents and lower N contents in PF compared to NF, resulting in high forest floor C/N ratios and a decrease in the quality of organic materials in forest floor under plantations. In general, soil C, N contents and their isotope changed significantly in the forest floor and mineral soil after land use change (LUC). Soil δ13C was significantly enriched in forest floor after LUC while both δ13C and δ15N values were enriched in mineral soils. Linear and non-linear regressions were observed for MAP and MAT in soil C/N ratios and soil δ13C, in their changes with NF conversion to PF while soil δ15N values were positively correlated with MAT. Our findings implied that LUC alters soil C turnover and contents and MAP drive soil δ13C dynamic.
Mbezele Junior Yannick Ngaba; Ya-Lin Hu; Roland Bol; Xiang-Qing Ma; Shaofei Jin; Abubakari Said Mgelwa. Effects of land use change from natural forest to plantation on C, N and natural abundance of 13C and 15N along a climate gradient in eastern China. Scientific Reports 2019, 9, 1 -12.
AMA StyleMbezele Junior Yannick Ngaba, Ya-Lin Hu, Roland Bol, Xiang-Qing Ma, Shaofei Jin, Abubakari Said Mgelwa. Effects of land use change from natural forest to plantation on C, N and natural abundance of 13C and 15N along a climate gradient in eastern China. Scientific Reports. 2019; 9 (1):1-12.
Chicago/Turabian StyleMbezele Junior Yannick Ngaba; Ya-Lin Hu; Roland Bol; Xiang-Qing Ma; Shaofei Jin; Abubakari Said Mgelwa. 2019. "Effects of land use change from natural forest to plantation on C, N and natural abundance of 13C and 15N along a climate gradient in eastern China." Scientific Reports 9, no. 1: 1-12.