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Deti Xie is a professor of Soil Science in China. He has served many roles including the Dean of the College of Resources and Environment, Southwest University, and PhD tutor of Agricultural Environmental Protection. He graduated from the Department of Soil Chemistry, Southwest Agricultural University, in 1988 with a doctorate degree. His main research interests include water quality, soil science, land resources, agricultural resources, and the environment. Professor Xie received the Sichuan Youth Science and Technology Award, the China Youth Science and Technology Award, and the Young and Middle-Aged Experts with Outstanding Contributions from the Ministry of Agriculture. He was also awarded a special government grant in 1992.
Crop–hedgerow intercropping systems are important agroforestry systems for preventing soil degradation and soil nutrient losses on sloping cultivated land in the Three Gorges Reservoir (TGR) area of China. However, the mechanism by which hedgerow spatial layouts and the planting patterns affect soil nutrients and crop yields is still uncertain. A two-year field experiment was performed on a 10° slope to investigate the effects of slope position and different crop–hedgerow intercropping systems on soil physicochemical properties and crop yields. The treatments were a two-belt mulberry contour hedgerow (TM), a two-belt compound mulberry–vetiver hedgerow (TCMV), a two-belt compound mulberry–alfalfa hedgerow (TCMA), a seven-year-old two-belt mulberry contour hedgerow (7YTM), a seven-year-old mulberry border hedgerow (7YBM), a seven-year-old pure mulberry (7YPM), and a control treatment (CT, no hedgerows). In all treatments, except 7YPM, there was a significant (p< 0.05) increase in crop yield, clay content, soil total nitrogen (STN), acid-hydrolyzable nitrogen (AHN), and soil organic carbon (SOC) with declining slope position, whereas soil bulk density (BD), sand content, and soil pH showed the opposite trend. In TM, TCMV, TCMA, and 7YTM, the mustard yields and soil properties were better than those in CT, and there was no significant (p > 0.05) difference in mustard yield or soil properties between the upper-middle and lower-middle slope positions. Compared with CT, TCMV, and TCMA increased mustard yields by 8.28% and 9.86%, respectively, while 7YTM, 7YBM, and 7YPM reduced mustard yields by 7.69%, 17.69%, and 29.73%, respectively. TCMV and TCMA were confirmed to be viable intercropping systems for significantly reducing nutrient losses, improving soil quality, and changing soil nutrient distributions to maintain optimum crop yields on sloping lands.
Ping Lei; Chengsheng Ni; Fangxin Chen; Sheng Wang; Shouqin Zhong; Shaojun Tan; Jiupai Ni; Deti Xie. Effects of Crop–Hedgerow Intercropping on the Soil Physicochemical Properties and Crop Yield on Sloping Cultivated Lands in a Purple Soil of Southwestern China. Forests 2021, 12, 962 .
AMA StylePing Lei, Chengsheng Ni, Fangxin Chen, Sheng Wang, Shouqin Zhong, Shaojun Tan, Jiupai Ni, Deti Xie. Effects of Crop–Hedgerow Intercropping on the Soil Physicochemical Properties and Crop Yield on Sloping Cultivated Lands in a Purple Soil of Southwestern China. Forests. 2021; 12 (8):962.
Chicago/Turabian StylePing Lei; Chengsheng Ni; Fangxin Chen; Sheng Wang; Shouqin Zhong; Shaojun Tan; Jiupai Ni; Deti Xie. 2021. "Effects of Crop–Hedgerow Intercropping on the Soil Physicochemical Properties and Crop Yield on Sloping Cultivated Lands in a Purple Soil of Southwestern China." Forests 12, no. 8: 962.
Nonpoint source pollution (NPS) has become the leading factor of global water quality problems, attracting great attention from governments and researchers in various countries. Based on this situation, understanding the current research status of NPS can help guide future research. However, most of the current reviews only describe the research status of some specific aspects but fail to quantify the research hotspots and development trends on the whole, which limits the overall understanding of NPS. In this paper, bibliometrics was used to study the current status, hotspots, and frontiers of NPS research during 1991–2015, and the future research development was predicted. Over the past 15 years, there has been a remarkable growth trend in publication output, and the participation of countries/territories has also increased. Journal of Environmental Quality, Journal of Hydrology, and Total Environmental Science were the top three journals. Sharpley AN and Arnold JG from the USA were the most productive authors with the best quality articles. The major author clusters and research regions are located in North America and Europe, followed by East Asia. The United States dominates this research field, with the largest number of independent and collaborative articles. Chinese authors gained more attention through international cooperation. Keyword analysis confirmed that water quality and nutrients were the main concerns of NPS pollution research, which mainly involved a number of research topics, such as pollutant emission reduction research and the evaluation and simulation of pollutants’ migration and their transformation under different situations, while pesticides were less of a concern, which suggests that the abuse of pesticides has come under control. Meanwhile, SWAT was the dominating model in the last decade partly because it satisfied the growing needs of watershed-scale management.
Ping Lei; Ram Shrestha; Bing Zhu; Suju Han; HongBin Yang; Shaojun Tan; Jiupai Ni; Deti Xie. A Bibliometric Analysis on Nonpoint Source Pollution: Current Status, Development, and Future. International Journal of Environmental Research and Public Health 2021, 18, 7723 .
AMA StylePing Lei, Ram Shrestha, Bing Zhu, Suju Han, HongBin Yang, Shaojun Tan, Jiupai Ni, Deti Xie. A Bibliometric Analysis on Nonpoint Source Pollution: Current Status, Development, and Future. International Journal of Environmental Research and Public Health. 2021; 18 (15):7723.
Chicago/Turabian StylePing Lei; Ram Shrestha; Bing Zhu; Suju Han; HongBin Yang; Shaojun Tan; Jiupai Ni; Deti Xie. 2021. "A Bibliometric Analysis on Nonpoint Source Pollution: Current Status, Development, and Future." International Journal of Environmental Research and Public Health 18, no. 15: 7723.
The biogeochemical consequences of denitrification and dissimilatory nitrate reduction to ammonium (DNRA) have a significant influence on nitrogen (N) cycling in the ecosystem. Many researchers have explored these two pathways in soil and sediment ecosystems under anaerobic conditions. However, limited information is available regarding the influence of external environmental conditions on these two pathways in a well-defined experimental system under aerobic conditions. In this study, the impacts of the external environmental factors (carbon source, C/N ratio, pH, and dissolved oxygen) on nitrite reduction through the denitrification and DNRA routes in Pseudomonasputida Y-9 were studied. Results found that sodium citrate and sodium acetate favored denitrification and DNRA, respectively. Furthermore, neutral pH and aerobic conditions both facilitated DNRA and denitrification. Especially, low C/N ratios motivated the DNRA while high C/N ratios stimulated the denitrification, which was opposite to the observed phenomena under anaerobic conditions.
Xuejiao Huang; Wenzhou Tie; Deti Xie; Zhenlun Li. Low C/N Ratios Promote Dissimilatory Nitrite Reduction to Ammonium in Pseudomonas putida Y-9 under Aerobic Conditions. Microorganisms 2021, 9, 1524 .
AMA StyleXuejiao Huang, Wenzhou Tie, Deti Xie, Zhenlun Li. Low C/N Ratios Promote Dissimilatory Nitrite Reduction to Ammonium in Pseudomonas putida Y-9 under Aerobic Conditions. Microorganisms. 2021; 9 (7):1524.
Chicago/Turabian StyleXuejiao Huang; Wenzhou Tie; Deti Xie; Zhenlun Li. 2021. "Low C/N Ratios Promote Dissimilatory Nitrite Reduction to Ammonium in Pseudomonas putida Y-9 under Aerobic Conditions." Microorganisms 9, no. 7: 1524.
The concurrent effect of elevated CO2 (eCO2) concentrations and arbuscular mycorrhizal fungi (AMF) on plant growth, carbon (C), nitrogen (N), phosphorus (P) and potassium (K) accumulations in plant and soil is largely unknown. To understand the mechanisms of eCO2 and mycorrhization on wheat (Triticum aestivum) performance and soil fertility, wheat seedlings were grown under four different CO2 environments for 12 weeks, including (1) ambient CO2 (ACO2, 410/460 ppm, daytime/nighttime), (2) sole daytime eCO2 (DeCO2, 550/460 ppm), (3) sole nighttime eCO2 (NeCO2, 410/610 ppm), and (4) dual or continuous daytime/nighttime eCO2 ((D + N)eCO2, 550/610 ppm), and with or without AMF (Funneliformis mosseae) colonization. DeCO2, NeCO2 and (D + N)eCO2 generally significantly increased shoot and root biomass, plant C, N, P and K accumulation, soil invertase and urease activity, but decreased shoot and root N, P and K concentrations, and soil available N, P and K. Compared with non-AMF, AMF effects on above-mentioned characteristics were significantly positive under ACO2, DeCO2 and (D + N)eCO2, but negative on plant biomass, C, N, P and K accumulation under NeCO2. Overall, AMF colonization alleviated soil nutrient constraints on plant responses to DeCO2, while NeCO2 decreased AMF’s beneficial effects on plants. These results demonstrated that an integration of AMF’s benefits to plants under factual field DeCO2 and/or NeCO2 will be critical for managing the long-term consequence of future CO2 rising on global cropping systems.
Songmei Shi; Xie Luo; Miao Wen; Xingshui Dong; Sharifullah Sharifi; Deti Xie; Xinhua He. Funneliformis mosseae Improves Growth and Nutrient Accumulation in Wheat by Facilitating Soil Nutrient Uptake under Elevated CO2 at Daytime, Not Nighttime. Journal of Fungi 2021, 7, 458 .
AMA StyleSongmei Shi, Xie Luo, Miao Wen, Xingshui Dong, Sharifullah Sharifi, Deti Xie, Xinhua He. Funneliformis mosseae Improves Growth and Nutrient Accumulation in Wheat by Facilitating Soil Nutrient Uptake under Elevated CO2 at Daytime, Not Nighttime. Journal of Fungi. 2021; 7 (6):458.
Chicago/Turabian StyleSongmei Shi; Xie Luo; Miao Wen; Xingshui Dong; Sharifullah Sharifi; Deti Xie; Xinhua He. 2021. "Funneliformis mosseae Improves Growth and Nutrient Accumulation in Wheat by Facilitating Soil Nutrient Uptake under Elevated CO2 at Daytime, Not Nighttime." Journal of Fungi 7, no. 6: 458.
The evaluation of scale management suitability provides a comprehensive assessment of the various factors driving farmland management conditions. This research objectively evaluated the conditions for scale management suitability by applying the entropy-TOPSIS method with the aim of effectively balancing the space for agricultural production, the development of towns, and ecological protection. First, to ensure a balance between agricultural production, urban development, and ecological protection, 13 indexes were selected to represent the following three areas: natural factors, socioeconomic factors, and characteristics of cultivated land factors. The original matrix was standardized to evaluate the suitability of natural resources, the social economy, and cultivated land conditions, and a comprehensive suitability evaluation of scale management in the Jiangjin District of Chongqing was conducted. The research results divide the study area into four regions based on the level of scale management suitability. Examining the spatial distribution, the level of scale management suitability decreased gradually from north to south, regions at the high and middle levels of scale management suitability were concentrated in the northern area beside the Yangtze river, and the regions at a low level were concentrated in the southern mountain area. This research can provide a reference for the rational utilization of land resources and land use policymaking.
Xiaoteng Cao; Chaofu Wei; Deti Xie. Evaluation of Scale Management Suitability Based on the Entropy-TOPSIS Method. Land 2021, 10, 416 .
AMA StyleXiaoteng Cao, Chaofu Wei, Deti Xie. Evaluation of Scale Management Suitability Based on the Entropy-TOPSIS Method. Land. 2021; 10 (4):416.
Chicago/Turabian StyleXiaoteng Cao; Chaofu Wei; Deti Xie. 2021. "Evaluation of Scale Management Suitability Based on the Entropy-TOPSIS Method." Land 10, no. 4: 416.
The removal of ammonium and nitrate by bacterium via assimilation could prevent the nitrogen loss. In this study, the removal efficiency and conversion characteristics of ammonium and nitrate by a cold-tolerant bacterium, Pseudomonas putida Y-9, were explored. Strain Y-9 efficiently removed ammonium and nitrate (less than 100 mg L−1) with removal rates of greater than 99.36% and 82.00%, respectively. The ammonium removal efficiency still reached 87.24% when the ammonium concentration was up to 500 mg L−1, and strain Y-9 preferentially used ammonium over nitrate. Furthermore, less than 0.12% of the nitrogen was converted to nitrite, and 78.03% and 55.30% of the nitrogen were transformed into biological nitrogen when strain Y-9 was cultivated in ammonium and nitrate media, respectively. Nitrate reductase and nitrite reductase activity were detected in strain Y-9, while ammonia monooxygenase activity was undetectable. Allylthiourea showed no effect on ammonium removal but sodium azide strongly inhibited nitrate removal by strain Y-9. Altogether, the results revealed that strain Y-9 could remove large amounts of ammonium and nitrate, mainly through assimilation, and results in nearly no harmful nitrite accumulation.
Xuejiao Huang; Daihua Jiang; Jiupai Ni; Deti Xie; Zhenlun Li. Removal of ammonium and nitrate by the hypothermia bacterium Pseudomonas putida Y-9 mainly through assimilation. Environmental Technology & Innovation 2021, 22, 101458 .
AMA StyleXuejiao Huang, Daihua Jiang, Jiupai Ni, Deti Xie, Zhenlun Li. Removal of ammonium and nitrate by the hypothermia bacterium Pseudomonas putida Y-9 mainly through assimilation. Environmental Technology & Innovation. 2021; 22 ():101458.
Chicago/Turabian StyleXuejiao Huang; Daihua Jiang; Jiupai Ni; Deti Xie; Zhenlun Li. 2021. "Removal of ammonium and nitrate by the hypothermia bacterium Pseudomonas putida Y-9 mainly through assimilation." Environmental Technology & Innovation 22, no. : 101458.
α-PbO2-type Mn0.5Ti0.5NbO4-based oxides are studied as cathode materials in solid oxide electrolysis cell (SOEC) for the direct electrolysis of steam or CO2 at 800 °C. Comparison between Mn0.5Ti0.5NbO4 and the Fe-doped ones, Fe0.3Mn0.35Ti0.35NbO4 and Fe0.6Mn0.2Ti0.2NbO4, indicates that the Fe3+ doping increases the electric conductivity in air but decreases the stability of the α-PbO2 structure in reducing atmosphere as in Fe0.6Mn0.2Ti0.2NbO4. The electric conductivity in reducing atmosphere is found to be ascribed to Ti4+-O-Ti3+ and Fe3+-O-Fe2+ in Mn0.5Ti0.5NbO4 and Fe doped ones, respectively. The steam or CO2 electrolsysis indicates that 30% Fe3+ substitution for Mn/Ti decreases the polarization resistance at low bias, but 60% Fe doping increases the polarization resistance dramatically than Mn0.5Ti0.5NbO4. The excessive Fe3+ doping is found to induce the phase transformation and delamination on the cathode/electrolyte interface under a cathodic current. The electrolyser with Fe0.3Mn0.35Ti0.35NbO4 cathode on zirconia-based electrolyte imparts a stable current density of 2.32 Acm−2 at −1.6 V if Ar-88% H2O is used as feeding gas. Analysis of the gas product indicates that H2 is produced and the Faradaic efficiency at −1.4 V and −1.6 V is found to be 100% and 93%, respectively.
Wenji Ruan; Xiangling Yue; Jiupai Ni; Deti Xie; Chengsheng Ni. α-PbO2-type niobate as efficient cathode materials for steam and CO2 electrolysis. Journal of Power Sources 2020, 483, 229234 .
AMA StyleWenji Ruan, Xiangling Yue, Jiupai Ni, Deti Xie, Chengsheng Ni. α-PbO2-type niobate as efficient cathode materials for steam and CO2 electrolysis. Journal of Power Sources. 2020; 483 ():229234.
Chicago/Turabian StyleWenji Ruan; Xiangling Yue; Jiupai Ni; Deti Xie; Chengsheng Ni. 2020. "α-PbO2-type niobate as efficient cathode materials for steam and CO2 electrolysis." Journal of Power Sources 483, no. : 229234.
Nitrogen (N) fertilizers are increasingly being used to meet crop demand for the expanding human population. However, historical N‐use efficiency (NUE) is low for rice paddy fields compared to upland ecosystems. This study aimed to investigate the fate of N fertilizer and compared NUE under different tillage regimes in a rice‐based agroecosystem. A long‐term field study of tillage regimes (i.e. flooded paddy field, conventional tillage and ridge tillage) and 15N isotope tracer methods (in‐situ and incubation) was used to determine N fertilizer fate and uptake. Nitrogen uptake by rice (which represents NUE) significantly differed between tillage regimes (P< 0.05). Nitrogen‐use efficiency was 31% of applied N fertilizer for ridge tillage, which was the highest among the three tillage regimes, while the lowest NUE occurred for conventional tillage (17%). The soil residual N for ridge tillage was significantly higher (21%), than for the flooded paddy field or conventional tillage. The total gaseous N loss was highest for ridge tillage (28%) and lowest for conventional tillage (17%). Ammonia (NH3) volatilization accounted for the largest proportion of gaseous loss from N fertilizer for all three tillage regimes. However, the largest loss of applied N was with water (runoff and leaching), where N loss accounted for 20% of applied N for ridge tillage but up to 54% for conventional tillage. Ridge tillage changed the soil micro‐topography and water regimes leading to better N conservation. Based on these results, adoption of ridge tillage should significantly improve NUE for rice paddy fields.
Chuan Qin; Alan L. Wright; Lihua Ma; Xinhua He; Deti Xie; Xianjun Jiang. Improving nitrogen‐use efficiency by using ridge tillage in rice paddy soils. Soil Use and Management 2020, 1 .
AMA StyleChuan Qin, Alan L. Wright, Lihua Ma, Xinhua He, Deti Xie, Xianjun Jiang. Improving nitrogen‐use efficiency by using ridge tillage in rice paddy soils. Soil Use and Management. 2020; ():1.
Chicago/Turabian StyleChuan Qin; Alan L. Wright; Lihua Ma; Xinhua He; Deti Xie; Xianjun Jiang. 2020. "Improving nitrogen‐use efficiency by using ridge tillage in rice paddy soils." Soil Use and Management , no. : 1.
Reasonable evaluation of the intensive urban land use has emerged as an important issue and hot topic for urban development. This paper aims to construct a unified framework for evaluating the intensive use of urban land and analyzing its influence channels. It combines the advantages of the approach of the indicator system and that of efficiency measurement, and provides an empirical test to apply this analytical framework using the panel data of 38 districts and counties in Chongqing, China, ranging from 2009 to 2018. To achieve our goals, we used the panel data model and stochastic frontier analysis (SFA) model with decomposed technical inefficiency. Our results show that: (1) the level of intensive use of urban land in all districts and counties of Chongqing is steadily increasing, and the gap among regions is narrowing, (2) all districts and counties of Chongqing face severe and increasing difficulty in improving their intensive urban land use, and, (3) currently, the degree of external dependence is not a stable influential factor for land-use efficiency and intensive potential in these districts and counties, and improving the land use structure, increasing population density, strengthening fiscal expenditure on education, and promoting transportation convenience can markedly reduce land use inefficiency and simultaneously increase intensive land use. In conclusion, the framework for evaluating intensive use of urban land based on the SFA model with decomposed technical inefficiency can better integrate intensive land-use evaluation and the factor analysis process, and retain the scalability of factor analysis. For all districts and counties in Chongqing, we clarify several effective channels to promote the intensive use of urban land, which provides reference and technical support for formulating land policies.
Jingyi Wang; Kaisi Sun; Jiupai Ni; Deti Xie. Evaluation and Factor Analysis of the Intensive Use of Urban Land Based on Technical Efficiency Measurement—A Case Study of 38 Districts and Counties in Chongqing, China. Sustainability 2020, 12, 8623 .
AMA StyleJingyi Wang, Kaisi Sun, Jiupai Ni, Deti Xie. Evaluation and Factor Analysis of the Intensive Use of Urban Land Based on Technical Efficiency Measurement—A Case Study of 38 Districts and Counties in Chongqing, China. Sustainability. 2020; 12 (20):8623.
Chicago/Turabian StyleJingyi Wang; Kaisi Sun; Jiupai Ni; Deti Xie. 2020. "Evaluation and Factor Analysis of the Intensive Use of Urban Land Based on Technical Efficiency Measurement—A Case Study of 38 Districts and Counties in Chongqing, China." Sustainability 12, no. 20: 8623.
Purple soils, developing from rapid physical weathering of nutrient rich sedimentary rock and classified as Inceptisols or Entisols in United States Department of Agriculture (USDA) Taxonomy, are the most important agricultural soils in the Sichuan basin of southwestern China. A portion of purple soils has been acidified and the acidification risk of these soils need further understanding. Here, electrodialysis (ED) was used to simulate the process of natural acidification of soils. We investigated the acidification risk of purple soils by ED treatments and compared its acidification characteristics with that of variable charge soils (Oxisol and Alfisol). Our results showed that the degree of acidification of purple soils after ED treatments was much higher than that of variable charge soils, although the purple soils contained more exchangeable base cations. There was no significant correlation between the purple soil acidity before and after ED treatments, however, the pH of purple soils after the ED treatments had a significant negative correlation (r = −0.680, P < 0.01) with the soil cation exchange capacity (CEC). We concluded that CEC (i.e., effective negative surface charges) played a decisive role in determining the acidification potential of purple soils. High content of clay minerals and low content of Fe/Al oxides in the purple soils lead to the higher amount of effective negative surface charge than that of variable charge soils, which induced the rise in the amount of H+ and Al3+ absorbed on the surface of purple soils and increased the acidification degree of purple soils remarkably. Therefore, compared to the variable charge soils, the purple soils had a higher acidification risk. These findings will provide a useful reference for the understanding of the acidification characteristics of purple soils.
Zhongyi Li; Pengshun Wang; Li Liu; Yunyun Zheng; Deti Xie. High negative surface charge increases the acidification risk of purple soil in China. CATENA 2020, 196, 104819 .
AMA StyleZhongyi Li, Pengshun Wang, Li Liu, Yunyun Zheng, Deti Xie. High negative surface charge increases the acidification risk of purple soil in China. CATENA. 2020; 196 ():104819.
Chicago/Turabian StyleZhongyi Li; Pengshun Wang; Li Liu; Yunyun Zheng; Deti Xie. 2020. "High negative surface charge increases the acidification risk of purple soil in China." CATENA 196, no. : 104819.
Techniques for controlling rural non-point source pollution (RNSP) represent cleaner production techniques that can provide an effective guarantee for regional sustainable development. The majority of studies on RNSP control technologies are mainly aimed at handling only a single pollution source. However, such studies are difficult to perform in rural areas, which have dense populations, complex terrains and extreme climates, such as the Three Gorges Reservoir Area (TGRA), China. Therefore, this paper focuses on the application of the RNSP control technologies based on the following four aspects: crop planting, livestock production, domestic inputs and water-level-fluctuating (WLF) zone. Based on the unique topography, land features and planting patterns of the TGRA, a three-dimensional (3D) and multi-source integrated technology system for controlling RNSP was established according to the principle of source reduction, runoff regulation, and nitrogen (N) and phosphorus (P) loss control. From the results of the long-term observations, the risk of RNSP has been significantly reduced in the study area. The nutrient capacity of the soil increased by 9–15%, while the chemical fertilizer application reduced by 30–50%. The loss of sediment, N and P were reduced by 60–80%, 30–70% and 50–90% in the sloping land at the backslope, respectively, by 30–60%, 70–90%, and 70–90% in the paddy field at the footslope, respectively, and by 75–90%, 30–50%, 65–95% in the WLF zone, respectively. The average removal rates of COD, NH3-N and TN in sewage in the residential area were higher than 82%, 87% and 63.3%, respectively. Overall, more than 90% of RNSP was reduced by using this 3D and multi-source technology system, and it can be widely promoted for controlling RNSP in similar ecological areas with support from local governments by implementing effective measures, such as strengthening environmental protection education and government subsidies.
Shouqin Zhong; Fangxin Chen; Deti Xie; Jingan Shao; Yi Yong; Sheng Zhang; Qingwen Zhang; Chaofu Wei; Qingyuan Yang; Jiupai Ni. A three-dimensional and multi-source integrated technology system for controlling rural non-point source pollution in the Three Gorges Reservoir Area, China. Journal of Cleaner Production 2020, 272, 122579 .
AMA StyleShouqin Zhong, Fangxin Chen, Deti Xie, Jingan Shao, Yi Yong, Sheng Zhang, Qingwen Zhang, Chaofu Wei, Qingyuan Yang, Jiupai Ni. A three-dimensional and multi-source integrated technology system for controlling rural non-point source pollution in the Three Gorges Reservoir Area, China. Journal of Cleaner Production. 2020; 272 ():122579.
Chicago/Turabian StyleShouqin Zhong; Fangxin Chen; Deti Xie; Jingan Shao; Yi Yong; Sheng Zhang; Qingwen Zhang; Chaofu Wei; Qingyuan Yang; Jiupai Ni. 2020. "A three-dimensional and multi-source integrated technology system for controlling rural non-point source pollution in the Three Gorges Reservoir Area, China." Journal of Cleaner Production 272, no. : 122579.
The aim of this study was to investigate the possibility of a simultaneous nitrification–denitrification hypothermic bacterium for applying in Cd(II), Co(II), and Mn(II)-contaminated wastewater. The influence of Cd(II), Co(II), and Mn(II) on the inorganic nitrogen removal capacity of the hypothermia bacterium Arthrobacter arilaitensis Y-10 was determined. The experimental results demonstrated that low concentration of Cd(II) (2.5 mg/L) exhibited no significant impact on bioremediation of ammonium. The nitrate and nitrite removal activities of strain Y-10 were enhanced by 0.1 and 0.25 mg/L of Cd(II), but hindered by more than 0.25 and 0.5 mg/L of Cd(II), respectively. However, the cell growth and denitrification activity ceased immediately once Co(II) was supplemented. In terms of Mn(II), no conspicuous inhibitory impact on ammonium bioremediation was observed even if Mn(II) concentration reached as high as 30 mg/L. The bioremediation of nitrates and nitrites was significantly improved by 0.5 mg/L of Mn(II), and then dropped sharply along with the increase of Mn(II). The order of the degree of inhibitory influence of the three heavy metal ions on the nitrogen bioremediation ability of strain Y-10 was Co(II) > Cd(II) > Mn(II). All the results highlighted that the heterotrophic nitrification was less sensitive to the inhibitory effects of Cd(II), Co(II), and Mn(II) relative to aerobic denitrification.
Tengxia He; Deti Xie; Jiupai Ni; Zhu Li; Zhenlun Li. Effect of Cobalt, Cadmium and Manganese on Nitrogen Removal Capacity of Arthrobacter arilaitensis Y-10. Water 2020, 12, 1 .
AMA StyleTengxia He, Deti Xie, Jiupai Ni, Zhu Li, Zhenlun Li. Effect of Cobalt, Cadmium and Manganese on Nitrogen Removal Capacity of Arthrobacter arilaitensis Y-10. Water. 2020; 12 (6):1.
Chicago/Turabian StyleTengxia He; Deti Xie; Jiupai Ni; Zhu Li; Zhenlun Li. 2020. "Effect of Cobalt, Cadmium and Manganese on Nitrogen Removal Capacity of Arthrobacter arilaitensis Y-10." Water 12, no. 6: 1.
Multi-mineral sand particles (MSPs), commonly found in upland soils, can change the erosion properties, structure, moisture level, porosity, and permeability of soil; however, their effects are generally neglected in previous studies. In this study, we explored the morphology using scanning electron microscopy (SEM), particle size distribution (PSD), aggregation state, and mineralogy of soils derived from two types of clay rocks containing MSPs: shale and mudstone. The results showed that: (1) small lamellate bodies formed granules and blocks in a face-to-face or side-to-side manner and that the aggregation particles ranged from several to tens of microns in diameter, which increased gradually in a downslope direction; (2) the sand content in shale- and mudstone-derived soils decreased from 41.0% and 31.3%, respectively, on the summit to 19.6% and 18.4%, respectively, on the toeslope, whereas their clay content increased from 23.3% and 20.2% to 45.0% and 38.9%, respectively; (3) regarding the aggregation states of soil particles, the content of 0.25–2 mm MSPs in the shale- and mudstone-derived soils decreased from 62.9% and 45.2%, respectively, on the summit to 7.1% and 1.4%, respectively, on the toeslope, with averages of 42.3% and 20.8%, respectively. The content of 0.25–2 mm aggregates in the shale- and mudstone-derived soils increased from 9.1% and 6.2%, respectively, on the summit to 44.4% and 21.1%, respectively, on the toeslope, with averages of 21.5% and 14.2%, respectively; and (4) the mineralogy of the clay rock-derived soils and MSPs was generally dominated by illite, montmorillonite, vermiculite and calcite, which was similar to the mineralogy of the parent rocks. Therefore, a large amount of MSPs was found in clay rock-derived soils whose particle characteristics were determined by the environment of diagenesis and the physical weathering of pedogenesis.
Shouqin Zhong; Chaofu Wei; Jiupai Ni; Deti Xie; Chengsheng Ni. Characterization of clay rock-derived soils containing multi-mineral sand particles in upland areas of Sichuan Basin, China. CATENA 2020, 194, 104737 .
AMA StyleShouqin Zhong, Chaofu Wei, Jiupai Ni, Deti Xie, Chengsheng Ni. Characterization of clay rock-derived soils containing multi-mineral sand particles in upland areas of Sichuan Basin, China. CATENA. 2020; 194 ():104737.
Chicago/Turabian StyleShouqin Zhong; Chaofu Wei; Jiupai Ni; Deti Xie; Chengsheng Ni. 2020. "Characterization of clay rock-derived soils containing multi-mineral sand particles in upland areas of Sichuan Basin, China." CATENA 194, no. : 104737.
Nitrogen (N) losses contribute to a series of ecological problems such as non-point source pollution and aquatic eutrophication. The effects of tillage practices on N losses in the sloping upland of the Three Gorges Reservoir (TGR) area was studied by comparing N losses of three conservation tillage practices (no-till, mulch-till and minimum till) in a short-term field experiment with the conventional one. N losses from plots of the no-till and minimum till treatments were less than those from plots of the conventional tillage treatment by 19.03 and 6.33 kg N ha−1, respectively. Moreover, a meta-analysis of related data published between 1991 and 2017 was showed that conservation tillage (bootstrap confidence intervals of −57.35% to −7.86%) significantly reduced N losses more than conventional tillage. No-till (bootstrap confidence intervals of −48.76% to −13.23%) was more effective in reducing N losses than mulch-till (bootstrap confidence intervals of −56.65% to 14.52%). Moreover, the effect of no-till was stronger (bootstrap confidence intervals of −66.38% to −34.29% and −69.32% to −34.29%, respectively) on carbon-poor (<10 g kg−1) and N-poor (<0.7 g kg−1) soils. These results indicate that the conservation tillage practice significantly reduced N losses (especially N losses via surface runoff) in the sloping upland of the TGR area compared with conventional tillage and the no-till was more effective at reducing N losses than mulch-till in the nutrient-poor soil. Moreover, no-till did better in reducing the N losses in surface runoff than in subsurface leachate. Therefore, we recommend the use of no-till as a farming practice to reduce N losses and facilitate the sustainable development of agriculture in the sloping upland of the TGR area.
Yang Zhang; Deti Xie; Jiupai Ni; Xibai Zeng. Conservation tillage practices reduce nitrogen losses in the sloping upland of the Three Gorges Reservoir area: No-till is better than mulch-till. Agriculture, Ecosystems & Environment 2020, 300, 107003 .
AMA StyleYang Zhang, Deti Xie, Jiupai Ni, Xibai Zeng. Conservation tillage practices reduce nitrogen losses in the sloping upland of the Three Gorges Reservoir area: No-till is better than mulch-till. Agriculture, Ecosystems & Environment. 2020; 300 ():107003.
Chicago/Turabian StyleYang Zhang; Deti Xie; Jiupai Ni; Xibai Zeng. 2020. "Conservation tillage practices reduce nitrogen losses in the sloping upland of the Three Gorges Reservoir area: No-till is better than mulch-till." Agriculture, Ecosystems & Environment 300, no. : 107003.
High-intensity utilization of sloping farmland causes serious soil erosion and agricultural non-point source pollution (AGNSP) in the Three Gorges Reservoir Area (TGRA). Crop-mulberry systems are important agroforestry systems for controlling soil, water, and nutrient losses. However, there are many different mulberry hedgerow planting patterns in the TGRA. In this study, soil structure, nutrient buildup, and runoff nutrient loss were observed in field runoff plots with five configurations: P1 (two longitudinal mulberry hedgerows), P2 (two mulberry contour hedgerows), P3 (three mulberry contour hedgerows), P4 (mulberry hedgerow border), and P5 (mulberry hedgerow border and one mulberry contour hedgerow), as well as a control (CT; no mulberry hedgerows). P1 had the smallest percentage of aggregate destruction (18.8%) and largest mean weight diameter (4.48 mm). P5 led to the greatest accumulation of ammonium nitrogen (NH4+–N) and total phosphorus (TP) (13.4 kg ha−1 and 1444.5 kg ha−1 on average, respectively), while P4 led to the greatest accumulation of available phosphorus (AP), nitrate nitrogen (NO3−–N), and total nitrogen (TN) (114.0, 14.9, and 1694.1 kg ha−1, respectively). P5 was best at preventing soil erosion, with the smallest average annual runoff and sediment loss of 112.2 m3 ha−1 and 0.06 t ha−1, respectively, which were over 72.4% and 87.4% lower than those in CT, respectively. P5 and P4 intercepted the most N in runoff, with average NH4+–N, NO3−–N, particulate N, and TN losses of approximately 0.09, 0.07, 0.41, and 0.58 kg ha−1, respectively, which were 49.7%, 76.2%, 71.3%, and 69.9% lower than those in CT, respectively. P5 intercepted the most P in runoff, with average TP and total dissolved phosphorus (TDP) losses of 0.09 and 0.04 kg ha−1, respectively, which were 77.5% and 70.4% lower than those in CT, respectively. Therefore, the pattern with one mulberry hedgerow border and one mulberry contour hedgerow (P5) best controlled AGNSP, followed by that with only a mulberry hedgerow border (P4).
Shouqin Zhong; Zhen Han; Jiangwen Li; Deti Xie; Qingyuan Yang; Jiupai Ni. Mechanized and Optimized Configuration Pattern of Crop-Mulberry Systems for Controlling Agricultural Non-Point Source Pollution on Sloping Farmland in the Three Gorges Reservoir Area, China. International Journal of Environmental Research and Public Health 2020, 17, 3599 .
AMA StyleShouqin Zhong, Zhen Han, Jiangwen Li, Deti Xie, Qingyuan Yang, Jiupai Ni. Mechanized and Optimized Configuration Pattern of Crop-Mulberry Systems for Controlling Agricultural Non-Point Source Pollution on Sloping Farmland in the Three Gorges Reservoir Area, China. International Journal of Environmental Research and Public Health. 2020; 17 (10):3599.
Chicago/Turabian StyleShouqin Zhong; Zhen Han; Jiangwen Li; Deti Xie; Qingyuan Yang; Jiupai Ni. 2020. "Mechanized and Optimized Configuration Pattern of Crop-Mulberry Systems for Controlling Agricultural Non-Point Source Pollution on Sloping Farmland in the Three Gorges Reservoir Area, China." International Journal of Environmental Research and Public Health 17, no. 10: 3599.
Agricultural non-point source pollution (NPSP) is becoming a severe threat and seriously restricting the sustainable development of agricultural economy and rural environment in the Three Gorges Reservoir Areas (TGRA). However, limited studies have focused on agricultural NPSP management in TGRA, especially for integrated technology systems with TGRA characteristics. An integrated slopping land/paddy field/hydro-fluctuation belt eco-system (SPHES) was constructed using best management practices in this study. Evaluation results of the SPHES at the comprehensive test demonstration zone showed that ecological engineering interception technologies on slopping land can reduce 80–90 % of sediment, 20–30 % of nitrogen (N), and 25–35 % of phosphorus (P), respectively. The utility of interception and absorption technology under ridge cropping pattern in paddy fields can effectively control inorganic N in sewage and P in external sewage within one week. Biological sequestration technologies of N and P in hydro-fluctuation belt can intercept 30–50 % of total N, 65–95 % of total P, and 75–90 % of sediments. In summary, the comprehensive removal rate of pollutants in agricultural NPSP exceeded 89 % using this eco-system. The work presented here provides the construction of this integrated eco-system for agricultural NPSP controlling, thereby applying to all small watersheds in the TGRA to control and manage agricultural NPSP. This integrated technology system has broad prospects for promotion and application in similar ecological areas.
Tong Zhang; Yuheng Yang; Jiupai Ni; Deti Xie. Construction of an integrated technology system for control agricultural non-point source pollution in the Three Gorges Reservoir Areas. Agriculture, Ecosystems & Environment 2020, 295, 106919 .
AMA StyleTong Zhang, Yuheng Yang, Jiupai Ni, Deti Xie. Construction of an integrated technology system for control agricultural non-point source pollution in the Three Gorges Reservoir Areas. Agriculture, Ecosystems & Environment. 2020; 295 ():106919.
Chicago/Turabian StyleTong Zhang; Yuheng Yang; Jiupai Ni; Deti Xie. 2020. "Construction of an integrated technology system for control agricultural non-point source pollution in the Three Gorges Reservoir Areas." Agriculture, Ecosystems & Environment 295, no. : 106919.
Most metal oxide nanoparticles (NPs) can impact ammonium removal, but the underlying mechanism remains unclear. In this study, high doses of NiO, CuO, ZnO and TiO2 (>1 mg/L) inhibited the ammonium removal performance of Pseudomonas putida Y-9. Interestingly, low levels of CuO NPs (0.1, 0.5 mg/L) and NiO NPs (0.1 mg/L) enhanced ammonium removal efficiency. Moreover, a decrease in Mg2+ levels was significantly positively correlated with ammonium removal efficiency, while negatively correlated with the Ti2+, Zn2+, and Cu2+ release of NPs. Further research on effect of NPs and their corresponding cations on ammonium removal revealed that four NPs affected Mg2+ absorption in Y-9 via different routes, thus impacting NH4+ removal efficiency, i.e., the effect of NiO NPs was caused by itself, TiO2 NPs’ impact was solely due to the release Ti4+, while the influence of CuO NPs and ZnO NPs was based on both the particles and released ions.
Xuejiao Huang; Yaxin Wang; Jiupai Ni; Deti Xie; Zhenlun Li. Metal oxide nanoparticles resonate to ammonium removal through influencing Mg2+ absorption by Pseudomonas putida Y-9. Bioresource Technology 2019, 296, 122339 .
AMA StyleXuejiao Huang, Yaxin Wang, Jiupai Ni, Deti Xie, Zhenlun Li. Metal oxide nanoparticles resonate to ammonium removal through influencing Mg2+ absorption by Pseudomonas putida Y-9. Bioresource Technology. 2019; 296 ():122339.
Chicago/Turabian StyleXuejiao Huang; Yaxin Wang; Jiupai Ni; Deti Xie; Zhenlun Li. 2019. "Metal oxide nanoparticles resonate to ammonium removal through influencing Mg2+ absorption by Pseudomonas putida Y-9." Bioresource Technology 296, no. : 122339.
A new nitrite accumulation pathway was discovered in the nitrogen conversion process of Arthrobacter arilaitensis. The extracellular nitrite reached 0.65 and 43.66 mg/L with hydroxylamine and nitrate as the sole nitrogen source, respectively. The enzyme activities of ammonia monooxygenase, hydroxylamine oxidoreductase and nitrate reductase were 0.42, 0.0014 and 0.0049 U/mg protein, respectively. The activity of nitrite reductase was completely inhibited by diethyldithiocarbamate. Intriguingly, the intracellular nitrite accumulated as high as 43.0, 42.26, 39.94 and 35.01 mg/L, when the Arthrobacter arilaitensis was incubated with Luria-Bertani medium, ammonium, nitrate and nitrite as the nitrogen source, respectively. These results confirmed that the highest concentration of intracellular nitrite was accumulated when LB was selected as the nitrogen source, followed by ammonium and nitrate, then nitrite was the least. To date, biochemical mechanism responsible for the accumulation of a high concentration of intracellular nitrite is unknown.
Tengxia He; Deti Xie; Jiupai Ni; Zhu Li; Zhenlun Li. Characteristics of nitrogen transformation and intracellular nitrite accumulation by the hypothermia bacterium Arthrobacter arilaitensis. Science of The Total Environment 2019, 701, 134730 .
AMA StyleTengxia He, Deti Xie, Jiupai Ni, Zhu Li, Zhenlun Li. Characteristics of nitrogen transformation and intracellular nitrite accumulation by the hypothermia bacterium Arthrobacter arilaitensis. Science of The Total Environment. 2019; 701 ():134730.
Chicago/Turabian StyleTengxia He; Deti Xie; Jiupai Ni; Zhu Li; Zhenlun Li. 2019. "Characteristics of nitrogen transformation and intracellular nitrite accumulation by the hypothermia bacterium Arthrobacter arilaitensis." Science of The Total Environment 701, no. : 134730.
Traditional fingerprinting methods discriminate sediment sources based on differences in the source geological conditions or land use types. However, whether this method is effective if both the geological conditions and land use types are similar and the circumstances under which the method can be used remain unclear. To further understand the scope of applying the fingerprint identification method, this study selected the Wangjiagou catchment, which consists of subcatchments A and B, as the target. In this catchment, corn (Zea mays L.) was the species with the highest proportion in the dry land. Furthermore, the geological conditions in the catchment are consistent and, the soil is Eutric Regosol developed from the purple rock strata of the Jurassic system. A total of 85 source samples were collected in subcatchments A and B, and 11 sediment samples were collected at the outlets of the each of the subcatchments in the rainy season (from June to October). This research analyzed 48 geochemical elements as the potential fingerprint factors. In this case, the optimum composite fingerprint consisted of five individual properties (Zn, Ce, La, Li and Eu) in subcatchment, whereas four geochemical properties (Mn, La, Ni and Lu) passed the stepwise discriminant function analysis in subcatchment B. These properties exhibited discriminative powers of 100% in the respective subcatchments. The research results indicated the following: first, the multivariate mixing model can provide the contribution rates of each sediment source; second, the goodness of fit (GOF) of this model was greater than 95% in both subcatchments; and third, the sediment uncertainty of each source was within 5% in both subcatchment A and B. These findings indicate that the fingerprinting method can be used in areas with small differences in land use and geological conditions. The results show that great focus needs to paid to soil erosion on slope land in subcatchment A and mulberry fields in subcatchment B. In this area, high-impact human activities (i.e., extensive channel excavation and highly intense machine cultivation) have negated certain soil and water conservation measures. Therefore, in order to reduce soil erosion and ensure that the existing soil and water conservation measures are effective, farmers should implement rational channel management and no tillage or minimal tillage practices. Furthermore, to improve the fertilizer utilization rate of agro-ecosystems, deep fertilizer application and straw return technology should be promoted.
Fangxin Chen; Xiaoyan Wang; Xinxin Li; Jinliang Wang; Deti Xie; Jiupai Ni; Yaojun Liu. Using the sediment fingerprinting method to identify the sediment sources in small catchments with similar geological conditions. Agriculture, Ecosystems & Environment 2019, 286, 106655 .
AMA StyleFangxin Chen, Xiaoyan Wang, Xinxin Li, Jinliang Wang, Deti Xie, Jiupai Ni, Yaojun Liu. Using the sediment fingerprinting method to identify the sediment sources in small catchments with similar geological conditions. Agriculture, Ecosystems & Environment. 2019; 286 ():106655.
Chicago/Turabian StyleFangxin Chen; Xiaoyan Wang; Xinxin Li; Jinliang Wang; Deti Xie; Jiupai Ni; Yaojun Liu. 2019. "Using the sediment fingerprinting method to identify the sediment sources in small catchments with similar geological conditions." Agriculture, Ecosystems & Environment 286, no. : 106655.
Best management practices (BMPs) are implemented to reduce non‐point source pollution (NPSP) worldwide. In this study, the AnnAGNPS model was developed and used to evaluate the effectiveness of BMPs for NPSP control in the Three Gorges Reservoir Area in China. Through field investigation and experimental observation, the AnnAGNPS model database was constructed. The model best simulated runoff, and its simulation of total nitrogen (TN) was better than for total phosphorus (TP). Simulation of the spatial distribution of different pollutant loads showed that the annual outputs of TN and TP per unit area were the highest, with an average of 63 and 6 kg/hm2·per year, respectively. The optimal scenario was based on the optimization and adjustment of the existing land structure which was most effective at reducing N and P loads. The reduction rates of TN and TP loads were 54% and 63%, respectively, while the reduction rates of dissolved and particulate N and P loads were between 47% and 68%. After 27% of arid slope fields were converted into terraces in the study area, the modelled particulate N and P outputs were reduced by 44% and 46%, respectively, showing that terracing sloping land could be effective at reducing particulate N and P losses. These findings indicated that slope‐shifting technology is the most important method for NPSP control in the TGRA. In addition, reduced fertilizer use and conservation tillage measures should also be adopted to effectively reduce TN and TP losses. This article is protected by copyright. All rights reserved.
Tong Zhang; Yuheng Yang; Jiupai Ni; Deti Xie. Best management practices for agricultural non‐point source pollution in a small watershed based on the Ann AGNPS model. Soil Use and Management 2019, 36, 45 -57.
AMA StyleTong Zhang, Yuheng Yang, Jiupai Ni, Deti Xie. Best management practices for agricultural non‐point source pollution in a small watershed based on the Ann AGNPS model. Soil Use and Management. 2019; 36 (1):45-57.
Chicago/Turabian StyleTong Zhang; Yuheng Yang; Jiupai Ni; Deti Xie. 2019. "Best management practices for agricultural non‐point source pollution in a small watershed based on the Ann AGNPS model." Soil Use and Management 36, no. 1: 45-57.