期刊
GEOPHYSICAL RESEARCH LETTERS
卷 49, 期 4, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL096833
关键词
fertilization experimental data; crop N uptake conceptualization; fully distributed catchment modeling; integrated agri-environment functioning; climatic variability; targeted mitigation measures
资金
- Helmholtz Association
- Projekt DEAL
Diffuse nitrogen pollution from agriculture exerts high pressures on groundwater and aquatic ecosystems. Integrated analysis and targeted measures based on interdisciplinary data and methods can help mitigate the impacts of this pollution, especially under the cumulative effects of changing climate and fertilizer-use intensities.
Diffuse Nitrogen pollution from agriculture maintains high pressures on groundwater and aquatic ecosystems. Further mitigation requires targeted measures that reconcile agricultural interests in environmental protection. However, the agriculture-related processes of catchment N modeling remain poorly defined due to discipline-specific data and knowledge gaps. Using field-experimental data, crop N uptake responses to fertilizer management were parsimoniously conceptualized and integrated into a catchment diffuse-N model. The improved catchment modeling further facilitated integration with agricultural budget-based assessments. The integrated analysis in a mesoscale catchment disentangled contrasting agri-environment functional mechanisms in typically flashy chemodynamic and transport-limited chemostatic export regimes. Moreover, the former was actively responsive to interannual climatic variability and agricultural practices; the latter exhibited drought-induced enhancement of N enrichment, which could likely be mitigated through reduced fertilization. This interdisciplinary integration of data and methods provided an insightful evidence base for multi-sector targeted measures, especially under cumulative impacts of changing climate and fertilizer-use intensities.
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