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Global promotion of decarbonisation by using sustainable bio-renewables is associated with generation of ash residues whose amounts have increased exponentially in the last decades. Bioashes are physicochemically complex, ultra-alkaline, and potentially hazardous solids, but with a huge potential to become (co)products with environmental/economic value. Their diverse nature lends itself to a wide range of uses in land remediation, wastewater treatment, civil and bio-tech engineering, end even medicine. However, there are issues hindering the usage of bioashes as valuable resources: i) large variation among specific fractions and types, ii) strong and long-lasting reactivity and potential toxicity, and iii) an incoherent, often non-existent, legislative and regulatory framework for management of specific bio-wastes. Overcoming these obstacles and uncertainties regarding the ecological and economic benefits vs. negative side-effects is a significant challenge. The research and implementation work is urgently needed to i) elucidate dosage-dependent biological outcomes of bioash amendments, especially those related to soil and aquatic microbiomes as the primary living barriers/biofilters for most substances released from bioashes, and ii) transform finely powdered matrices to easy-to-apply forms (from nano/micro-to mm-sized agglomerates) to reduce human health implications. The continued progress in material sciences and nanotechnology offers a fascinating array of solutions for re-purposing bioashes; however, given the stringent quality-demanding criteria, the separation and concentration of targeted submatrices (e.g. aluminosilicates) from the bulk bioashes are yet to be achieved on the lab to industrial scales. Meanwhile, a significant reuse potential of bioashes will remain under-exploited and compounded by the adverse environmental issues arising from landfill disposal.
G. Ondrasek; M. Bubalo Kovačić; I. Carević; N. Štirmer; S. Stipičević; N. Udiković-Kolić; V. Filipović; D. Romić; Z. Rengel. Bioashes and their potential for reuse to sustain ecosystem services and underpin circular economy. Renewable and Sustainable Energy Reviews 2021, 151, 111540 .
AMA StyleG. Ondrasek, M. Bubalo Kovačić, I. Carević, N. Štirmer, S. Stipičević, N. Udiković-Kolić, V. Filipović, D. Romić, Z. Rengel. Bioashes and their potential for reuse to sustain ecosystem services and underpin circular economy. Renewable and Sustainable Energy Reviews. 2021; 151 ():111540.
Chicago/Turabian StyleG. Ondrasek; M. Bubalo Kovačić; I. Carević; N. Štirmer; S. Stipičević; N. Udiković-Kolić; V. Filipović; D. Romić; Z. Rengel. 2021. "Bioashes and their potential for reuse to sustain ecosystem services and underpin circular economy." Renewable and Sustainable Energy Reviews 151, no. : 111540.
Nitrate leaching through soil layers to groundwater may cause significant degradation of natural resources. The aims of this study were: (i) to estimate soil hydraulic properties (SHPs) of the similar soil type with same management on various locations; (ii) to determine annual water dynamics; and (iii) to estimate the impact of subsoil horizon properties on nitrate leaching. The final goal was to compare the influence of different SHPs and layering on water dynamics and nitrate leaching. The study was conducted in central Croatia (Zagreb), at four locations on Calcaric Phaeozem, Calcaric Regosol, and Calcaric Fluvic Phaeozem soil types. Soil hydraulic parameters were estimated using the HYPROP system and HYPROP-FIT software. Water dynamics and nitrate leaching were evaluated using HYDRUS 2D/3D during a period of 365 days. The amount of water in the soil under saturated conditions varied from 0.422 to 0.535 cm3 cm−3 while the hydraulic conductivity varied from 3 cm day−1 to 990.9 cm day−1. Even though all locations have the same land use and climatic conditions with similar physical properties, hydraulic parameters varied substantially. The amount and velocity of transported nitrate (HYDRUS 2D/3D) were affected by reduced hydraulic conductivity of the subsoil as nitrates are primarily transported via advective flux. Despite the large differences in SHPs of the topsoil layers, the deeper soil layers, having similar SHPs, imposed a buffering effect preventing faster nitrate downward transport. This contributed to a very similar distribution of nitrates through the soil profile at the end of simulation period. This case study indicated the importance of carefully selecting relevant parameters in multilayered soil systems when evaluating groundwater pollution risk.
Jasmina Defterdarović; Lana Filipović; Filip Kranjčec; Gabrijel Ondrašek; Diana Kikić; Alen Novosel; Ivan Mustać; Vedran Krevh; Ivan Magdić; Vedran Rubinić; Igor Bogunović; Ivan Dugan; Krešimir Čopec; Hailong He; Vilim Filipović. Determination of Soil Hydraulic Parameters and Evaluation of Water Dynamics and Nitrate Leaching in the Unsaturated Layered Zone: A Modeling Case Study in Central Croatia. Sustainability 2021, 13, 6688 .
AMA StyleJasmina Defterdarović, Lana Filipović, Filip Kranjčec, Gabrijel Ondrašek, Diana Kikić, Alen Novosel, Ivan Mustać, Vedran Krevh, Ivan Magdić, Vedran Rubinić, Igor Bogunović, Ivan Dugan, Krešimir Čopec, Hailong He, Vilim Filipović. Determination of Soil Hydraulic Parameters and Evaluation of Water Dynamics and Nitrate Leaching in the Unsaturated Layered Zone: A Modeling Case Study in Central Croatia. Sustainability. 2021; 13 (12):6688.
Chicago/Turabian StyleJasmina Defterdarović; Lana Filipović; Filip Kranjčec; Gabrijel Ondrašek; Diana Kikić; Alen Novosel; Ivan Mustać; Vedran Krevh; Ivan Magdić; Vedran Rubinić; Igor Bogunović; Ivan Dugan; Krešimir Čopec; Hailong He; Vilim Filipović. 2021. "Determination of Soil Hydraulic Parameters and Evaluation of Water Dynamics and Nitrate Leaching in the Unsaturated Layered Zone: A Modeling Case Study in Central Croatia." Sustainability 13, no. 12: 6688.
To test an assumption that organic soil can ameliorate nutritional disorders associated with metal and salinity stresses, we exposed salt-sensitive strawberry and lettuce to four salinity (0–60 mM NaCl) and three contamination (0.3–5 mg Cd/kg) rates in peat (pHH2O = 5.5). The results showed that, even at 20 mM NaCl, salinity stress exerted a dominant effect on rhizosphere biogeochemistry and physiological processes, inducing leaf-edge burns, chlorosis/necrosis, reducing vegetative growth in crops; at ≥40 mM, NaCl mortality was induced in strawberry. Signifiacntly decreased K/Na, Ca/Na and Mg/Na concentration ratios with raising salinity were confirmed in all tissues. The combined CdxNaCl stresses (vs. control) increased leaf Cd accumulation (up to 42-fold in lettuce and 23-fold in strawberry), whereas NaCl salinity increased the accumulation of Zn (>1.5-fold) and Cu (up to 1.2-fold) in leaves. Lettuce accumulated the toxic Cd concentration (up to 12.6 mg/kg) in leaves, suggesting the strong root-to-shoot transport of Cd. In strawberry Cd, concentration was similar (and sub-toxic) in fruits and leaves, 2.28 and 1.86 mg/kg, respectively, suggesting lower Cd root-to-shoot translocation, and similar Cd mobility in the xylem and phloem. Additionally, the accumulation of Cd in strawberry fruits was exacerbated at high NaCl exposure (60 mM) compared with lower NaCl concentrations. Thus, in salinized, slightly acidic and organically rich rhizosphere, pronounced organo- and/or chloro-complexation likely shifted metal biogeochemistry toward increased mobility and phytoavailability (with metal adsorption restricted due to Na+ oversaturation of the caton exchange complex in the substrate), confirming the importance of quality water and soils in avoiding abiotic stresses and producing non-contaminated food.
Gabrijel Ondrasek; Zed Rengel; Nada Maurović; Nada Kondres; Vilim Filipović; Radovan Savić; Boško Blagojević; Vjekoslav Tanaskovik; Cristian Gergichevich; Davor Romić. Growth and Element Uptake by Salt-Sensitive Crops under Combined NaCl and Cd Stresses. Plants 2021, 10, 1202 .
AMA StyleGabrijel Ondrasek, Zed Rengel, Nada Maurović, Nada Kondres, Vilim Filipović, Radovan Savić, Boško Blagojević, Vjekoslav Tanaskovik, Cristian Gergichevich, Davor Romić. Growth and Element Uptake by Salt-Sensitive Crops under Combined NaCl and Cd Stresses. Plants. 2021; 10 (6):1202.
Chicago/Turabian StyleGabrijel Ondrasek; Zed Rengel; Nada Maurović; Nada Kondres; Vilim Filipović; Radovan Savić; Boško Blagojević; Vjekoslav Tanaskovik; Cristian Gergichevich; Davor Romić. 2021. "Growth and Element Uptake by Salt-Sensitive Crops under Combined NaCl and Cd Stresses." Plants 10, no. 6: 1202.
Background The Nitrates Directive (ND) is an EU anti-pollution legislative that, for almost 30 years, has controlled and protected hydro-resources against excessive levels of nitrates originating from agroecosystems, striving to prevent the further exacerbation of the nitrates in aquatic environments. ND sets several principal goals that member states must accomplish, such as performing spatiotemporal nitrate analyses in ground/surface water networks to achieve national water quality monitoring programme. Results In this study, using the novel LUMNAqSoP approach, the prioritisation of 151 candidate groundwater stations for ND monitoring in Croatia was performed. The LUMNAqSoP integratively evaluates: (i) the most dominant loads from the agroecosystem (land use and management, net nitrogen application) and (ii) environmental (aquifer and soil) vulnerabilities and sensitivities of groundwater resources to nitrate pollution. By comparing stations which scored the most agro-environmental loads vs. the data from water stations containing elevated mean nitrate concentrations (from existing monitoring programmes) a very good agreement was confirmed. Moreover, deviations close to large urban zones were detected, suggesting that elevated nitrates in groundwaters in those areas likely originated from municipal/industrial rather than agricultural sources; however, further studies are needed for elucidation. Conclusions The presented approach can serve as a useful tool to policy makers and regulators for: (i) more efficient and reliable establishment of water monitoring programme pursuant to ND, as well as (ii) better management and shaping (designating/derogating) of nitrate-vulnerable zones, especially in diverse environmental conditions and dynamic agroecosystems as have been confirmed in recent decades across the EU member states.
G. Ondrasek; H. Bakić Begić; D. Romić; Ž. Brkić; S. Husnjak; M. Bubalo Kovačić. A novel LUMNAqSoP approach for prioritising groundwater monitoring stations for implementation of the Nitrates Directive. Environmental Sciences Europe 2021, 33, 1 -16.
AMA StyleG. Ondrasek, H. Bakić Begić, D. Romić, Ž. Brkić, S. Husnjak, M. Bubalo Kovačić. A novel LUMNAqSoP approach for prioritising groundwater monitoring stations for implementation of the Nitrates Directive. Environmental Sciences Europe. 2021; 33 (1):1-16.
Chicago/Turabian StyleG. Ondrasek; H. Bakić Begić; D. Romić; Ž. Brkić; S. Husnjak; M. Bubalo Kovačić. 2021. "A novel LUMNAqSoP approach for prioritising groundwater monitoring stations for implementation of the Nitrates Directive." Environmental Sciences Europe 33, no. 1: 1-16.
Biomass-fuelled facilities generate alkaline and mineral-/nutrient-enriched co-product (ash) that has to be appropriately managed, and preferably reused. The assumption that wood biomass fly ash (BFA) could be used in chemical amelioration of soil acidity and fertility was tested by: i) physicochemical characterisation of BFA and ii) bioassay with maize grown in acidic (pHKCl 4.68) hydromorphic soil amended with BFA (0-10% w/w). Scanning electron microscopy with energy dispersive X-ray spectroscopy and X-ray diffraction revealed non-homogeneous (ir)regular spherical/porous agglomerated particle morphology and distinctive distribution of Si-/Ca-/K-based minerals, while secondary ion mass spectrometry, for the first time, confirmed their isotopic (six Ca, three Si/Mg and two K isotopes) diversity. BFA addition strongly shifted soil pHKCl (up to 9.1), raised salinity (by >8.2-fold) and the content of most phytonutrients (up to 5.4-fold); however, BFA amendments at >1.25% restricted the maize root and shoot growth, likely due to alkaline stress as indicated by necrotic/chlorotic symptoms at >5.0% rate. The BFA amendments increased total concentration of metals in soil (without exceeding the levels recognised as contamination); however, phytoextraction of Cd, Zn, Mn, Cu and Mo was significantly supressed (Cd by almost 12-fold), confirming that BFA improved soil-plant metal immobilisation, shifting rhizosphere biogeochemistry towards chemisorption/precipitation reactions. Even though results revealed a strong liming and P-K-Ca-Mg-Zn-Mn-Cu enrichment potential of BFA, to avoid possible negative environmental implications (saline/alkaline stress, metal contamination, adverse effects on soil microbiome), quantitative and qualitative ex ante evaluation of the BFA/soil matrix combinations is essential before application to ameliorate suboptimal (acidic, low-nutrient) or metal-contaminated soils.
Gabrijel Ondrasek; Monika Zovko; Filip Kranjčec; Radovan Savić; Davor Romić; Zed Rengel. Wood biomass fly ash ameliorates acidic, low-nutrient hydromorphic soil & reduces metal accumulation in maize. Journal of Cleaner Production 2020, 283, 124650 .
AMA StyleGabrijel Ondrasek, Monika Zovko, Filip Kranjčec, Radovan Savić, Davor Romić, Zed Rengel. Wood biomass fly ash ameliorates acidic, low-nutrient hydromorphic soil & reduces metal accumulation in maize. Journal of Cleaner Production. 2020; 283 ():124650.
Chicago/Turabian StyleGabrijel Ondrasek; Monika Zovko; Filip Kranjčec; Radovan Savić; Davor Romić; Zed Rengel. 2020. "Wood biomass fly ash ameliorates acidic, low-nutrient hydromorphic soil & reduces metal accumulation in maize." Journal of Cleaner Production 283, no. : 124650.
A great portion of Earth’s freshwater and land resources are salt-affected and thus have restricted use or may become unsuitable for most human activities. Some of the recent scenarios warn that environmental salinization processes will continue to be exacerbated due to global climate change. The most relevant implications and side-effects in ecosystems under excessive salinity are destructive and long lasting (e.g. soil dispersion, water/soil hypersalinity, desertification, ruined biodiversity), often with non-feasible on site remediation, especially at larger scales. Agro-ecosystems are very sensitive to salinization; after a certain threshold is reached, yields and food quality start to deteriorate sharply. Additionally, salinity often coincides with numerous other environmental constrains (drought, waterlogging, pollution, acidity, nutrient deficiency, etc.) that progressively aggravate the threat to food security and general ecosystem resilience. Some well-proven, widely-used and cost-effective traditional ameliorative strategies (e.g. conservation agriculture, application of natural conditioners) help against salinity and other constraints, especially in developing countries. Remotely-sensed and integrated data of salt-affected areas combined with in situ and lab-based observations have never been so easy and rapid to acquire, precise and applicable on huge scales, representing a valuable tool for policy-makers and other stakeholders in implementing targeted measures to control and prevent ecosystem degradation (top-to-bottom approach). Continued progress in biotechnology and ecoengineering offers some of the most advanced and effective solutions against salinity (e.g. nanomaterials, marker-assisted breeding, genome editing, plant-microbial associations), albeit many knowledge gaps and ethical frontiers remain to be overcome before a successful transfer of these potential solutions to the industrial-scale food production can be effective.
Gabrijel Ondrasek; Zed Rengel. Environmental salinization processes: Detection, implications & solutions. Science of The Total Environment 2020, 754, 142432 .
AMA StyleGabrijel Ondrasek, Zed Rengel. Environmental salinization processes: Detection, implications & solutions. Science of The Total Environment. 2020; 754 ():142432.
Chicago/Turabian StyleGabrijel Ondrasek; Zed Rengel. 2020. "Environmental salinization processes: Detection, implications & solutions." Science of The Total Environment 754, no. : 142432.
Sediment matrices, as integral organo-mineral parts of aquatic bodies, can effectively bind and accumulate nutrients and potentially hazardous substances from diffuse and/or point sources of contamination. In this study, we analysed the longitudinal distribution of macronutrients (total N and available P and K) and the mechanical composition of the sediments of Jegricka watercourse (a part of the multi-functional Danube–Tisa–Danube canal network) known for its exposure to anthropogenic loads. The results showed that the nutrient pollution index was mostly above 1.0 (in 76%, 86% and 93% of the analysed samples for K, N and P, respectively), and the mean values for N, P and K were 2.69, 1.92 and 1.24, respectively. The average content of all nutrients and the sand fraction were significantly higher, whereas the clay fraction was considerably lower, in the sediment samples than in the adjacent arable Chernozem soil used as a benchmark. The differences in the nutrient contents and mechanical properties in the sediments were measured longitudinally (at upstream vs. downstream stations) and assessed using correlation, cluster analysis, and principal component analysis. The results suggest that the nutrient sources in the sediments as well as their transport and loading mechanisms along Jegricka watercourse are diverse and complex, likely driven by a combination of untreated industrial/urban wastewater discharges, erosion and surface runoff from the surrounding agricultural land. As a majority of the analysed watercourse banks belong to areas of special ecological value, the obtained results may be useful: i) indicators for designing and implementation of sustainable land/water policies and measures for the protection and rehabilitation of these valuable ecosystems, ii) inputs for testing/calibrating the sediment transport models and iii) the basis for sediment management.
Radovan Savic; Gabrijel Ondrasek; Rados Zemunac; Marina Bubalo Kovacic; Filip Kranjcec; Vesna Nikolic Jokanovic; Atila Bezdan. Longitudinal distribution of macronutrients in the sediments of Jegricka watercourse in Vojvodina, Serbia. Science of The Total Environment 2020, 754, 142138 .
AMA StyleRadovan Savic, Gabrijel Ondrasek, Rados Zemunac, Marina Bubalo Kovacic, Filip Kranjcec, Vesna Nikolic Jokanovic, Atila Bezdan. Longitudinal distribution of macronutrients in the sediments of Jegricka watercourse in Vojvodina, Serbia. Science of The Total Environment. 2020; 754 ():142138.
Chicago/Turabian StyleRadovan Savic; Gabrijel Ondrasek; Rados Zemunac; Marina Bubalo Kovacic; Filip Kranjcec; Vesna Nikolic Jokanovic; Atila Bezdan. 2020. "Longitudinal distribution of macronutrients in the sediments of Jegricka watercourse in Vojvodina, Serbia." Science of The Total Environment 754, no. : 142138.
One of negative side-effects of usage of bio-renewables might be generation of mineral (ash) material, potential source of environmental pollution. A hypothesis was that bottom ash (BA; from biomass cogeneration facility) could be efficiently (re) used in soil chemical conditioning similarly to widely-used dolomite-based soil conditioner (DO; from Croatian Dinaric-coastal region) which we tested by: i) physicochemical characterisation of BA and DO, and ii) bioassay with Raphanus sativus cultivated in acidic soil amended with BA or DO. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) confirmed complex chemical/physical structures and morphology between amendments, X-ray diffraction (XRD) showed their distinctive mineralogy with predominantly dolomite (in DO) vs. quartz and calcite (in BA), while secondary ion mass spectrometry (SIMS) revealed their diverse elemental/isotopic composition. The BA or DO amendments ameliorated soil acidity, increased available P, K and most other nutrients, but not Cd. The BA or DO amendments improved vegetative growth and edible hypocotyl yield. However, both amendments also increased Cd accumulation in all radish tissues, which was unexpected given the alkaline matrix of bio-ash and dolomite that would be likely to facilitate retention and immobilisation of toxic Cd. Thus, thorough characterisation and evaluation of BA- and/or DO-based materials and relevant soils (with an emphasis on metal sorption/immobilisation) prior to application in (agro) ecosystems is crucial for producing food clean of toxic metals.
Gabrijel Ondrasek; Filip Kranjčec; Lana Filipović; Vilim Filipović; Marina Bubalo Kovačić; Ivana Jelovica Badovinac; Robert Peter; Mladen Petravić; Jelena Macan; Zed Rengel. Biomass bottom ash & dolomite similarly ameliorate an acidic low-nutrient soil, improve phytonutrition and growth, but increase Cd accumulation in radish. Science of The Total Environment 2020, 753, 141902 .
AMA StyleGabrijel Ondrasek, Filip Kranjčec, Lana Filipović, Vilim Filipović, Marina Bubalo Kovačić, Ivana Jelovica Badovinac, Robert Peter, Mladen Petravić, Jelena Macan, Zed Rengel. Biomass bottom ash & dolomite similarly ameliorate an acidic low-nutrient soil, improve phytonutrition and growth, but increase Cd accumulation in radish. Science of The Total Environment. 2020; 753 ():141902.
Chicago/Turabian StyleGabrijel Ondrasek; Filip Kranjčec; Lana Filipović; Vilim Filipović; Marina Bubalo Kovačić; Ivana Jelovica Badovinac; Robert Peter; Mladen Petravić; Jelena Macan; Zed Rengel. 2020. "Biomass bottom ash & dolomite similarly ameliorate an acidic low-nutrient soil, improve phytonutrition and growth, but increase Cd accumulation in radish." Science of The Total Environment 753, no. : 141902.
Organic amendments are often reported to improve soil properties, promote plant growth, and improve crop yield. This study aimed to investigate the effects of the biochar and compost produced from sewage sludge and olive pomace on soil hydraulic properties, water flow, and P transport (i.e., sorption) using numerical modeling (HYDRUS-1D) applied to two soil types (Terra Rosa and Rendzina). Evaporation and leaching experiments on soil cores and repacked soil columns were performed to determine the soil water retention, hydraulic conductivity, P leaching potential, and P sorption capacity of these mixtures. In the majority of treatments, the soil water retention showed a small increase compared to the control soil. A reliable fit with the modified van Genuchten model was found, which was also confirmed by water flow modeling of leaching experiments (R2 0.99). The results showed a high P sorption in all the treatments (Kd 21.24 to 53.68 cm3 g–1), and a high model reliability when the inverse modeling procedure was used (R2 0.93 - 0.99). Overall, adding sewage sludge or olive pomace as compost or biochar improved the Terra Rosa and Rendzina water retention and did not increase the P mobility in these soils, proving to be a sustainable source of carbon and P-rich materials.
Vilim Filipović; Marko Černe; Jiří Šimůnek; Lana Filipović; Marija Romić; Gabrijel Ondrašek; Igor Bogunović; Ivan Mustać; Vedran Krevh; Anja Ferenčević; David Robinson; Igor Palčić; Igor Pasković; Smiljana Goreta Ban; Zoran Užila; Dean Ban. Modeling Water Flow and Phosphorus Sorption in a Soil Amended with Sewage Sludge and Olive Pomace as Compost or Biochar. Agronomy 2020, 10, 1163 .
AMA StyleVilim Filipović, Marko Černe, Jiří Šimůnek, Lana Filipović, Marija Romić, Gabrijel Ondrašek, Igor Bogunović, Ivan Mustać, Vedran Krevh, Anja Ferenčević, David Robinson, Igor Palčić, Igor Pasković, Smiljana Goreta Ban, Zoran Užila, Dean Ban. Modeling Water Flow and Phosphorus Sorption in a Soil Amended with Sewage Sludge and Olive Pomace as Compost or Biochar. Agronomy. 2020; 10 (8):1163.
Chicago/Turabian StyleVilim Filipović; Marko Černe; Jiří Šimůnek; Lana Filipović; Marija Romić; Gabrijel Ondrašek; Igor Bogunović; Ivan Mustać; Vedran Krevh; Anja Ferenčević; David Robinson; Igor Palčić; Igor Pasković; Smiljana Goreta Ban; Zoran Užila; Dean Ban. 2020. "Modeling Water Flow and Phosphorus Sorption in a Soil Amended with Sewage Sludge and Olive Pomace as Compost or Biochar." Agronomy 10, no. 8: 1163.
Polder-type agricultural catchments within river deltas are specific land formations which management is highly demanding from several aspects. The close contact with the coastal sea may additionally affect the quality of adjacent marine environment. This study uses the case of the Lower Neretva Valley (LNV) to test the efficiency of applying Linear Mixed Effect (LME) theory in modelling spatial and temporal variations of surface and groundwater quality within a polder-type agricultural catchment. The methodology uses linear regressive techniques while taking into account spatial and temporal autocorrelation of residuals. The objective was to assess and model the spatial and temporal variability of the quality of surface- and ground-waters, in order to predict the impact of natural processes and human activities. A dataset of physicochemical properties of surface and groundwater quality of the LNV, recorded monthly in the period 2009–2017, was used to model the spatial and temporal variations of water salinity and nitrate concentrations. The network of water quality monitoring sites covers four polders on five thousand hectares of agricultural land, including the following types of water bodies: river streams, lateral canals, pumping stations, drainage canals and groundwater. The method of data analysis, based on LME theory with correlated spatial and temporal residuals, takes also into account the heteroscedasticity of the variance associated with each type of water quality monitoring station. The two Linear Mixed Effects models proposed for the prediction of electrical conductivity and nitrate concentration in the surface waters and groundwater, proved to be efficient at adequately reproducing the heterogeneity and complexity of the study area. However, the prediction of nitrate concentration in the water was not equally satisfactory of the one of electrical conductivity due to the large variation in nutrient concentrations. To improve spatial prediction, the density of monitoring network should be increased.
Davor Romić; Annamaria Castrignanò; Marija Romić; Gabriele Buttafuoco; Marina Bubalo Kovačić; Gabrijel Ondrašek; Monika Zovko. Modelling spatial and temporal variability of water quality from different monitoring stations using mixed effects model theory. Science of The Total Environment 2019, 704, 135875 .
AMA StyleDavor Romić, Annamaria Castrignanò, Marija Romić, Gabriele Buttafuoco, Marina Bubalo Kovačić, Gabrijel Ondrašek, Monika Zovko. Modelling spatial and temporal variability of water quality from different monitoring stations using mixed effects model theory. Science of The Total Environment. 2019; 704 ():135875.
Chicago/Turabian StyleDavor Romić; Annamaria Castrignanò; Marija Romić; Gabriele Buttafuoco; Marina Bubalo Kovačić; Gabrijel Ondrašek; Monika Zovko. 2019. "Modelling spatial and temporal variability of water quality from different monitoring stations using mixed effects model theory." Science of The Total Environment 704, no. : 135875.
In contrast to some salts such as chlorides (Cl) that enhance cadmium (Cd) phyto-uptake, complex soil organics like humates (HA) potentially minimise Cd uptake, but are depleted in soils low in organic matter. Organically-depleted and salt-affected areas frequently coincide in (semi)arid agroecosystems where inappropriate management practices may load topsoils with Cd. We evaluated the impact of HA (0–100 mg/kg) and NaCl (0–60 mM) in Cd-contaminated (0–5 mg/kg) soil on the chemical changes in the rhizosphere and Cd uptake by two radish (Raphanus sativus L.) cultivars. In the rhizosphere solution the significant HAxCd interaction resulted in a decrease in Cd concentration with increasing HA rates, whereas the NaClxCd interaction was brought about by an increase in Cd concentration with NaCl rising. Also, the NaClxCd interaction increased Cd concentration in radish hypocotyl with increasing NaCl addition; in contrast, the HAxCd interaction reduced Cd concentration in hypocotyl, notably at the highest Cd rate, with increasing soil humification. The addition of HA acted as a biostimulant in both radish cultivars and decreased Cd accumulation (up to 44%), whereas NaCl stress reduced the root growth and enhanced total Cd accumulation (by almost 50%). Dose-dependent severity of Cd toxicity was confirmed in both cultivars by reduced growth and progressive (up to 2 orders of magnitude) Cd accumulation (vs. uncontaminated soil). Ion speciation modelling suggested that chemistry of deprotonated humates and chlorides is crucial for complexation of the most bioavailable Cd2+ species, thus driving Cd mobility within the soil matrix, including uptake by plants. Detected differences between the tested cultivars (e.g. lower Cd concentration in Sparkler vs. Cherry Belle) and their impacts on rhizosphere chemistry and Cd soil-plant acquisition/root-hypocotyl-shoot (re)distribution, suggest that genetic improvements (by developing and introducing salt- and/or metal-resistant varieties) should be exploited in phytoremediation of contaminated soils or for minimising metal accumulation in sustainable food production.
Gabrijel Ondrasek; Davor Romic; Zed Rengel. Interactions of humates and chlorides with cadmium drive soil cadmium chemistry and uptake by radish cultivars. Science of The Total Environment 2019, 702, 134887 .
AMA StyleGabrijel Ondrasek, Davor Romic, Zed Rengel. Interactions of humates and chlorides with cadmium drive soil cadmium chemistry and uptake by radish cultivars. Science of The Total Environment. 2019; 702 ():134887.
Chicago/Turabian StyleGabrijel Ondrasek; Davor Romic; Zed Rengel. 2019. "Interactions of humates and chlorides with cadmium drive soil cadmium chemistry and uptake by radish cultivars." Science of The Total Environment 702, no. : 134887.
Zinc (as an essential phytonutrient) and cadmium (as a toxic but readily bioavailable nonessential metal for plants) share similar routes for crossing plant biomembranes, although with a substantially different potential for translocation into above-ground tissues. The in situ distribution of these metals in plant cells and tissues (particularly intensively-dividing and fast-growing areas) is poorly understood. In this study, 17-day-old radish (Raphanus sativus L.) plants grown in nutrient solution were subjected to short-term (24 h) equimolar contamination (2.2 µM of each 70Zn and Cd) to investigate their accumulation and distribution in the shoot apex (leaf primordia) and edible fleshy hypocotyl tissues. After 24-h exposure, radish hypocotyl had similar concentration (in µg/g dry weight) of 70Zn (12.1 ± 1.1) and total Cd (12.9 ± 0.8), with relatively limited translocation of both metals to shoots (concentrations lower by 2.5-fold for 70Zn and 4.8-fold for Cd) as determined by inductively-coupled plasma mass spectrometry (ICP-MS). The in situ Zn/Cd distribution maps created by high-resolution secondary ion mass spectrometry (NanoSIMS, Cameca, Gennevilliers, France) imaging corresponded well with the ICP-MS data, confirming a similar pattern and uniform distribution of 70Zn and Cd across the examined areas. Both applied techniques can be powerful tools for quantification (ICP-MS) and localisation and visualisation (NanoSIMS) of some ultra-trace isotopes in the intensively-dividing cells and fast-growing tissues of non-metalophytes even after short-term metal exposure. The results emphasise the importance of the quality of (agro)ecosystem resources (growing media, metal-contaminated soils/waters) in the public health risk, given that, even under low contamination and short-term exposure, some of the most toxic metallic ions (e.g., Cd) can relatively rapidly enter the human food chain.
Gabrijel Ondrasek; Peta L. Clode; Matt R. Kilburn; Paul Guagliardo; Davor Romić; Zed Rengel. Zinc and Cadmium Mapping in the Apical Shoot and Hypocotyl Tissues of Radish by High-Resolution Secondary Ion Mass Spectrometry (NanoSIMS) after Short-Term Exposure to Metal Contamination. International Journal of Environmental Research and Public Health 2019, 16, 373 .
AMA StyleGabrijel Ondrasek, Peta L. Clode, Matt R. Kilburn, Paul Guagliardo, Davor Romić, Zed Rengel. Zinc and Cadmium Mapping in the Apical Shoot and Hypocotyl Tissues of Radish by High-Resolution Secondary Ion Mass Spectrometry (NanoSIMS) after Short-Term Exposure to Metal Contamination. International Journal of Environmental Research and Public Health. 2019; 16 (3):373.
Chicago/Turabian StyleGabrijel Ondrasek; Peta L. Clode; Matt R. Kilburn; Paul Guagliardo; Davor Romić; Zed Rengel. 2019. "Zinc and Cadmium Mapping in the Apical Shoot and Hypocotyl Tissues of Radish by High-Resolution Secondary Ion Mass Spectrometry (NanoSIMS) after Short-Term Exposure to Metal Contamination." International Journal of Environmental Research and Public Health 16, no. 3: 373.
Zinc as a micronutrient and cadmium as a nonessential toxic element share similar pathways for entering plant tissues and thus may be antagonistic. In nutrient solution culture, 17-day-old radish (Raphanus sativus L) plants were exposed to short-term (24 h) equimolar metal contamination (2.2 µM of each 70Zn and total Cd) to investigate the in situ Zn/Cd distribution in the apical root tissues using high-resolution secondary ion mass spectrometry (NanoSIMS) imaging. Inductively-coupled plasma mass spectrometry analysis of bulk root tissue confirmed large root uptake of both metal elements. After 24-h exposure the total root concentration (in µg/g DW) of 70Zn was 180 ± 24 (mean±SE) and of total Cd 352 ± 11. NanoSIMS mapping was performed on the cross sections of the radish root apex as a crucial component in root growth and uptake of water and nutrients from soil. Elemental maps of 70Zn and 114Cd isotopes revealed greater enrichment of both metals in the outer epidermal root layer than in cortical tissues and especially stele, confirming the epidermal root cells as preferential sites of metal uptake, and indicating relatively slow and less-intensive metal transport into other parts (edible hypocotyl, shoot) of metal-sensitive radish. NanoSIMS has been confirmed as a powerful tool for spatial detection and visualisation of some ultra-trace metal isotopes (e.g. 70Zn) in the fast-growing root tips. However, precise (sub)cellular mapping of diffusible metallic ions (Cd, Zn) remains a technically-challenging task in plant specimens given an unavoidable compromise between optimising methodology for structural preservation vs. authentic in vivo ion localisation.
Gabrijel Ondrasek; Zed Rengel; Peta Clode; Matt R. Kilburn; Paul Guagliardo; Davor Romic. Zinc and cadmium mapping by NanoSIMS within the root apex after short-term exposure to metal contamination. Ecotoxicology and Environmental Safety 2019, 171, 571 -578.
AMA StyleGabrijel Ondrasek, Zed Rengel, Peta Clode, Matt R. Kilburn, Paul Guagliardo, Davor Romic. Zinc and cadmium mapping by NanoSIMS within the root apex after short-term exposure to metal contamination. Ecotoxicology and Environmental Safety. 2019; 171 ():571-578.
Chicago/Turabian StyleGabrijel Ondrasek; Zed Rengel; Peta Clode; Matt R. Kilburn; Paul Guagliardo; Davor Romic. 2019. "Zinc and cadmium mapping by NanoSIMS within the root apex after short-term exposure to metal contamination." Ecotoxicology and Environmental Safety 171, no. : 571-578.
The biogeochemistry of soil organic matter (SOM), as a highly complex and dynamic soil property, is of vital importance for the health and ecological functioning of ecosystems, including managed and natural ones. Dominantly composed of carbon (C), SOM functions in global C cycling, including C sequestration and emission (e.g. soil respiration). Mediterranean agroecosystems especially, due to favourable climate conditions for mineralisation of SOM, are expected to go through enhanced SOM decomposition (i.e. C emission) under the ongoing global warming and related climatic change and variability (frequent heat waves, fires and extreme water disturbances). The relatively stable (humified) SOM components, especially in the organically-enriched topsoil layers, due to their specific physical chemistry (strongly charged interface) may have a significant role in biogeochemistry of charged (in)organic nutrients and/or contaminants such as toxic metal ions and persistent organic pollutants. The recent studies show that some natural vulnerabilities of Mediterranean regions (such as high risk of the erosion-driven processes) can increase movement of some hazardous pedospheric constituents (e.g. pesticides) to water bodies and/or into the air, thus influencing the whole ecosystem health. A majority of recent surveys confirm depletion of SOM and spatially variable distribution of metal contamination in the Mediterranean topsoils. Using the advanced geochemical prediction approaches in combination with the relevant soil databases, we characterised organo-mineral and organo-metal complexation and its effect on speciation and sorption of trace metals in karstified Mediterranean agroecosystems. Metal biogeochemistry was found to vary markedly under relatively constant pedosphere conditions, depending on organo-mineral soil components and pH, which may significantly impact metal mobility/availability in the soil-plant continuum. The knowledge of the SOM spatial distribution and dynamics and its interactions with other pedovariables is essential for sustainable management of SOM and control of contaminant mobility to avoid degradation processes in (agro)ecosystems.
Gabrijel Ondrasek; Helena Bakić Begić; Monika Zovko; Lana Filipović; Cristian Meriño-Gergichevich; Radovan Savic; Zed Rengel. Biogeochemistry of soil organic matter in agroecosystems & environmental implications. Science of The Total Environment 2018, 658, 1559 -1573.
AMA StyleGabrijel Ondrasek, Helena Bakić Begić, Monika Zovko, Lana Filipović, Cristian Meriño-Gergichevich, Radovan Savic, Zed Rengel. Biogeochemistry of soil organic matter in agroecosystems & environmental implications. Science of The Total Environment. 2018; 658 ():1559-1573.
Chicago/Turabian StyleGabrijel Ondrasek; Helena Bakić Begić; Monika Zovko; Lana Filipović; Cristian Meriño-Gergichevich; Radovan Savic; Zed Rengel. 2018. "Biogeochemistry of soil organic matter in agroecosystems & environmental implications." Science of The Total Environment 658, no. : 1559-1573.
Naturally-occurring highly-complexed and polymerised organics such as humic acids (HA), due to their large negative charge, play a crucial role in biogeochemistry of trace metals (TM). Toxic (Cd) as well as essential (Zn, Cu, Mn) TM bind strongly to HA, but how these organo-metalic forms influence metal uptake by plants is poorly understood. A solution culture study was conducted to characterize the effects of different concentrations of HA (0–225 mg/L) on the growth and element uptake/distribution in roots, shoots and hypocotyls of radish (Raphanus sativus L.) exposed to Cd (0.5 mg/L) contamination. After 10-d-exposure to applied treatments, Cd induced phytotoxicity; in contrast, different concentrations of HA had no influence on biomass, but decreased concentration of most TM in examined tissues (Cu by 4.2-fold, Zn by 2.2-fold, Cd by 1.6-fold and Mn by 34%) and their total plant accumulation (Cu by 73%, Cd by 39%, Zn by 29% and Mn by 22%). HA influenced the transport/distribution of TM, decreasing accumulation in roots and increasing their translocation/deposition in shoots, with no effect on TM content in edible hypocotyls. Chemical speciation modelling of the rooting medium confirmed predominance of free metallic forms in the control (no HA) and the pronounced organo-metal complexation in the HA treatments. The results provide evidence of strong capacity of HA to decrease phytoavailability and uptake of Cd, Zn, Cu and Mn while being non-toxic even at relatively high concentration (225 mg/L). Thus, HA, as naturally present soil components, control mobility and phyto-extraction of most TM as well as their phyto-accumulation.
Gabrijel Ondrasek; Zed Rengel; Davor Romic. Humic acids decrease uptake and distribution of trace metals, but not the growth of radish exposed to cadmium toxicity. Ecotoxicology and Environmental Safety 2018, 151, 55 -61.
AMA StyleGabrijel Ondrasek, Zed Rengel, Davor Romic. Humic acids decrease uptake and distribution of trace metals, but not the growth of radish exposed to cadmium toxicity. Ecotoxicology and Environmental Safety. 2018; 151 ():55-61.
Chicago/Turabian StyleGabrijel Ondrasek; Zed Rengel; Davor Romic. 2018. "Humic acids decrease uptake and distribution of trace metals, but not the growth of radish exposed to cadmium toxicity." Ecotoxicology and Environmental Safety 151, no. : 55-61.
Although Cd availability depends on its total concentration in soil, it is ultimately defined by the processes which control its mobility, transformations and soil solution speciation. Cd mobility between different soil fractions can be significantly affected by certain pedovariables such as soil organic matter (SOM; over formation of metal-organic complexes) and/or soil salinity (over formation of metal-inorganic complexes). Phytoavailable Cd fraction may be described as the proportion of the available Cd in soil which is actually accessible by roots and available for plant uptake. Therefore, in a greenhouse pot experiment Cd availability was observed in the rhizosphere of faba bean exposed to different levels of SOM, NaCl salinity (50 and 100mM) and Cd contamination (5 and 10mgkg(-1)). Cd availability in soil does not linearly follow its total concentration. Still, increasing soil Cd concentration may lead to increased Cd phytoavailability if the proportion of Cd(2+) pool in soil solution is enhanced. Reduced Cd (phyto)availability by raised SOM was found, along with increased proportion of Cd-DOC complexes in soil solution. Data suggest decreased Cd soil (phyto)availability with the application of salts. NaCl salinity affected Cd speciation in soil solution by promoting the formation of CdCln(2-n) complexes. Results possibly suggest that increased Cd mobility in soil does not result in its increased availability if soil adsorption capacity for Cd has not been exceeded. Accordingly, chloro-complex possibly operated just as a Cd carrier between different soil fractions and resulted only in transfer between solid phases and not in increased (phyto)availability.
Lana Filipović; Marija Romić; Davor Romić; Vilim Filipović; Gabrijel Ondrašek. Organic matter and salinity modify cadmium soil (phyto)availability. Ecotoxicology and Environmental Safety 2018, 147, 824 -831.
AMA StyleLana Filipović, Marija Romić, Davor Romić, Vilim Filipović, Gabrijel Ondrašek. Organic matter and salinity modify cadmium soil (phyto)availability. Ecotoxicology and Environmental Safety. 2018; 147 ():824-831.
Chicago/Turabian StyleLana Filipović; Marija Romić; Davor Romić; Vilim Filipović; Gabrijel Ondrašek. 2018. "Organic matter and salinity modify cadmium soil (phyto)availability." Ecotoxicology and Environmental Safety 147, no. : 824-831.
Radovan Savic; Gabrijel Ondrasek; Ljubomir Letic; Vesna Nikolic; Vjekoslav Tanaskovik. Nutrients accumulation in drainage channel sediments. International Journal of Sediment Research 2017, 32, 180 -185.
AMA StyleRadovan Savic, Gabrijel Ondrasek, Ljubomir Letic, Vesna Nikolic, Vjekoslav Tanaskovik. Nutrients accumulation in drainage channel sediments. International Journal of Sediment Research. 2017; 32 (2):180-185.
Chicago/Turabian StyleRadovan Savic; Gabrijel Ondrasek; Ljubomir Letic; Vesna Nikolic; Vjekoslav Tanaskovik. 2017. "Nutrients accumulation in drainage channel sediments." International Journal of Sediment Research 32, no. 2: 180-185.
U radu se analizira stanje kvaliteta vode i sedimenata kanalisanog vodotoka Tatarnica. Ovaj vodotok predstavlja i glavni kanal jednog od sistema za odvodnjavanje, koji je lociran dvadesetak kilometara zapadno od Novog Sada (Vojvodina, Srbija). Kvalitet vode i sedimenta ovog vodotoka, pored ostalog, značajan je zbog toga što se njegove vode koriste za navodnjavanje povrtarskih kultura na okolnim obradivim površinama ali i zbog toga što se uliva u Dunav u zoni akvatorije posebne ekološke vrednosti, parka prirode Begečka jama. Na osnovu mesečnog uzorkovanja vode i analize relevantnih indikatora kvaliteta, tokom perioda 2006-2012. godine, prikazani su rezultati sedmogodišnjeg monitoringa kvaliteta vode i sedimenata. Prema većini relevantnih parametara kvaliteta, u najvećem broju uzoraka, voda ima dobar ekološki potencijal. Međutim, konstatovana je i povremena pojava vode neodgovarajućeg kvaliteta, najčešće kada je u pitanju organsko zagađenje iskazano preko povećanih vrednosti biološke i hemijske potrošnje kiseonika (BPK5 i HPK) kod oko 35% uzoraka. Odstupanja od zahtevanog kvaliteta vode konstatovana su i kod ostalih parametara u oko 10-25% uzoraka. Sastav sedimenata, po svim razmatranim parametrima, uglavnom je u granicama koje nemaju negativne posledice na životnu sredinu u kanalu i njegovom okruženju.
Radovan Savić; Jasmina Josimov-Dunđerski; Anđelka Belić; Gabrijel Ondrašek; Ljubomir Letić; Vesna Nikolic. Monitoring kvaliteta vode i sedimenta manjih vodotoka u Vojvodini – primer vodotoka Tatarnica. АГРОЗНАЊЕ 2016, 16, 181 -192.
AMA StyleRadovan Savić, Jasmina Josimov-Dunđerski, Anđelka Belić, Gabrijel Ondrašek, Ljubomir Letić, Vesna Nikolic. Monitoring kvaliteta vode i sedimenta manjih vodotoka u Vojvodini – primer vodotoka Tatarnica. АГРОЗНАЊЕ. 2016; 16 (2):181-192.
Chicago/Turabian StyleRadovan Savić; Jasmina Josimov-Dunđerski; Anđelka Belić; Gabrijel Ondrašek; Ljubomir Letić; Vesna Nikolic. 2016. "Monitoring kvaliteta vode i sedimenta manjih vodotoka u Vojvodini – primer vodotoka Tatarnica." АГРОЗНАЊЕ 16, no. 2: 181-192.
Radovan Savic; Jagos R. Radovic; Gabrijel Ondrasek; Sanja Pantelic. OCCURRENCE AND SOURCES OF POLYCYCLIC AROMATIC HYDROCARBONS (PAHs) IN DRAINAGE CHANNEL SEDIMENTS IN VOJVODINA (SERBIA). Environmental Engineering and Management Journal 2016, 15, 287 -295.
AMA StyleRadovan Savic, Jagos R. Radovic, Gabrijel Ondrasek, Sanja Pantelic. OCCURRENCE AND SOURCES OF POLYCYCLIC AROMATIC HYDROCARBONS (PAHs) IN DRAINAGE CHANNEL SEDIMENTS IN VOJVODINA (SERBIA). Environmental Engineering and Management Journal. 2016; 15 (2):287-295.
Chicago/Turabian StyleRadovan Savic; Jagos R. Radovic; Gabrijel Ondrasek; Sanja Pantelic. 2016. "OCCURRENCE AND SOURCES OF POLYCYCLIC AROMATIC HYDROCARBONS (PAHs) IN DRAINAGE CHANNEL SEDIMENTS IN VOJVODINA (SERBIA)." Environmental Engineering and Management Journal 15, no. 2: 287-295.
Based on the monthly monitoring of the relevant indicators of surface water quality during the period of analysis, from year 2006 to 2011, an unsatisfactory ecological status and frequent occurrence of the worst quality class was noted in the Krivaja watercourse. This situation considerably limits or prevents the use of water from this river for any purpose. Also, based on the data from the three measuring stations, the longitudinal distribution of the analyzed parameters and degradation of water quality along the Krivaja watercourse was found. Protection, revitalization and rational management of Krivaja waters as an important water resource of the areas it flows through, would make this watercourse deleted from the surface water quality "black spots" list. As soon as the identified problems have been overcome, apart from being a wastewater recipient, the Krivaja can be used for other purposes without the risk of adverse effects. Furthermore, its waters and coastline may again be attractive and usable (for the irrigation of the surrounding farmland and safe food production).
Radovan Savić; Atila Bezdan; Jasmina Josimov-Dunđerski; Ljubomir Letić; Vesna Nikolić; Gabrijel Ondrašek. Water Quality Degradation of Krivaja Watercourse. АГРОЗНАЊЕ 2015, 15, 159 .
AMA StyleRadovan Savić, Atila Bezdan, Jasmina Josimov-Dunđerski, Ljubomir Letić, Vesna Nikolić, Gabrijel Ondrašek. Water Quality Degradation of Krivaja Watercourse. АГРОЗНАЊЕ. 2015; 15 (2):159.
Chicago/Turabian StyleRadovan Savić; Atila Bezdan; Jasmina Josimov-Dunđerski; Ljubomir Letić; Vesna Nikolić; Gabrijel Ondrašek. 2015. "Water Quality Degradation of Krivaja Watercourse." АГРОЗНАЊЕ 15, no. 2: 159.