Occurrence of Dissimilatory Nitrate Reduction to Ammonium (DNRA) in Groundwater Table Fluctuation Zones during Dissolved Organic Nitrogen Leaching through Unsaturated Zone

Journal of Hazardous Materials, Год журнала: 2025, Номер 489, С. 137501 - 137501

Опубликована: Фев. 6, 2025

Язык: Английский

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Water quality management could halve future water scarcity cost-effectively in the Pearl River Basin

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Июль 6, 2024

Abstract Reducing water scarcity requires both mitigation of the increasing pollution and adaptation to changing availability demand resources under global change. However, state-of-the-art modeling efforts often ignore quality associated biogeochemical processes in design reduction measures. Here, we identify cost-effective options for reducing future by accounting quantity highly stressed polluted Pearl River Basin China various socio-economic climatic change scenarios based on Shared Socio-economic Pathways (SSPs) Representative Concentration (RCPs). Our approach integrates a nutrient model (MARINA-Nutrients) with cost-optimization procedure, considering biogeochemistry human activities land spatially explicit way. Results indicate that is expected increase factor four most parts 2050 RCP8.5-SSP5 scenario. also show management could half analysis serve as an example assessment other river basins around world inform measures reduce scarcity.

Язык: Английский

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Transport Pathways of Nitrate in Stormwater Runoff Inferred from High-Frequency Sampling and Stable Water Isotopes

Environmental Science & Technology, Год журнала: 2024, Номер unknown

Опубликована: Авг. 17, 2024

Storm events can mobilize nitrogen species from landscapes into streams, exacerbating eutrophication and threatening aquatic ecosystems as well human health. However, the transport pathways storm responses of different forms remain elusive. We used high-frequency chemical isotopic sampling to partition sources stormwater runoff determine multiple in an agricultural catchment. Bayesian mixing modeling reveals shallow subsurface water dominant source runoff, contributing 74% flux 72, 71, 79% total (TN), dissolved (TDN), nitrate (NO

Язык: Английский

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Enhanced fertilizer utilization and heavy metals immobilization by ball-milling bentonite with NH4Cl: Experiments and DFT calculations

Journal of Hazardous Materials, Год журнала: 2024, Номер 466, С. 133616 - 133616

Опубликована: Янв. 25, 2024

Язык: Английский

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Long-term water quality dynamics and trend assessment reveal the effectiveness of ecological compensation: Insights from China’s first cross-provincial compensation watershed

Ecological Indicators, Год журнала: 2024, Номер 169, С. 112853 - 112853

Опубликована: Ноя. 16, 2024

Язык: Английский

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Implementing constructed wetlands for nutrient reduction at watershed scale: Opportunity to link models and real-world execution

Journal of Soil and Water Conservation, Год журнала: 2024, Номер 79(3), С. 113 - 131

Опубликована: Янв. 1, 2024

The negative effects of nutrient pollution in streams, rivers, and downstream waterbodies remain widespread global problems. Understanding the cost-effectiveness different strategies for mitigating is critical to making informed decisions defining expectations that best utilize limited resources, which a research priority US Environmental Protection Agency. To this end, we modeled management practices including residue management, cover crops, filter strips, grassed waterways, constructed wetlands, reducing fertilizer upper East Fork Little Miami River, an 892 km

Язык: Английский

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Long-term water quality dynamics and influencing factors under ecological compensation mechanisms: A case study of China's first cross-provincial ecological compensation watershed

Journal of Environmental Management, Год журнала: 2025, Номер 380, С. 125142 - 125142

Опубликована: Март 31, 2025

Язык: Английский

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Legacy Nitrogen Impeding the Achievement of Nitrogen Management Targets: Evidence from China's First Cross-Provincial Compensation Watershed

Environmental Technology & Innovation, Год журнала: 2025, Номер unknown, С. 104178 - 104178

Опубликована: Март 1, 2025

Язык: Английский

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Competitive Roles of DNRA and Denitrification on Organic Nitrogen Dynamics in Partially Saturated Soil‐Water Systems

Water Resources Research, Год журнала: 2025, Номер 61(4)

Опубликована: Апрель 1, 2025

Abstract We focus on the competition between nitrate/nitrite ammonification (also termed dissimilatory nitrate reduction to ammonium (DNRA)) and denitrification processes taking place across partially saturated water‐soil systems. The study is motivated by observation that joint presence of dissolved organic nitrogen (DON) redox fluctuation in vadose zone poses potential risks for generation nitrates (NO 3 − ‐N) can then be reduced (NH 4 + through DNRA. examine dynamics induced natural soil samples subject controlled drying‐wetting cycles. Upon experimental evidences, we estimate parameters driving kinetics associated with transformation. This enables us document a DNRA during wetting periods. find increasing carbon‐to‐nitrogen (C/N) ratio system yields significant increase rates, corresponding their contribution reduction. rate documented ( ) significantly faster loam than sandy loam, due carbon release from aggregates, b more effective amino acid urea soil, role as source. Our analysis further suggests relevance hydrogeochemical factors (e.g., moisture variation, texture, C/N ratio) DON transformation influence functional microorganisms. These insights advance our understanding agroecosystems, which has implications environmental management practices aimed at controlling NO ‐N pollution soils.

Язык: Английский

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Towards a cost-effective framework for estimating soil nitrogen pools using pedotransfer functions and machine learning

Geoderma, Год журнала: 2023, Номер 440, С. 116692 - 116692

Опубликована: Ноя. 20, 2023

Globally, the strategic use of nitrogen (N) is important in optimizing economic returns and reducing soil losses to environment. Incorporating reliable estimates mineralized over a growing season (GSN) into N-fertilizer rate prescriptions critical, but may often lack direct measurement. For this purpose, Pedotransfer functions (PTFs) total (TN) – representing stable pool from which N biological availability (BNA) labile mineralization were used estimate GSN. GSN was calculated based on TN BNA results health database (SHD), also includes suite related parameters (n = 2222). Using process recursive feature elimination (RFE) cost-benefit (CBFE), best predictors TN, BNA, identified using machine learners (MLs) regression analysis. RFE revealed that active carbon (AC), sand (Sa), organic matter (OM) yielding Lin's concordance correlation coefficient (CCC) 0.80 reduction theoretical cost 41 % compared control. CBFE resulted AC, respiration (SR), clay, Sa, OM as most cost-effective with CCC 0.79 savings 49 below all appropriate SHD. With respect aggregate stability (AS), SR, 0.78 23 %. retained S, pH 29 cost. Finally, AS, 0.82 17 CBFE, other hand, sand, OM, cost-efficient while maintaining Of MLs for pattern recognition (i.e., cubist, random forest, support vector machine, stochastic gradient boosting), cubist model outperformed others majority iterations processes. The framework, N-related PTFs developed study will greatly enhance our ability predict N-pool dynamics incorporate recommendations producers worldwide. Improvements predictive strength could be achieved by incorporating climate management practices PTF development. Another area improvement future would include addition spatial landscape variability N-measures via digital mapping applications.

Язык: Английский

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