Deciphering runoff-sediment-nutrient dynamics in agricultural watersheds supplied by large feeder Rivers: A multi-scale analysis
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View abstract on PubMed
Summary
This summary is machine-generated.Agricultural watershed management is complex, with runoff stable but sediment load significantly reduced. Hydrologic infrastructure alters nutrient transport, requiring adaptive management strategies for water quality.
Area Of Science
- Environmental Science
- Hydrology
- Agricultural Science
Background
- The runoff-sediment-nutrient continuum is crucial for agricultural sustainability and water resource integrity.
- Spatiotemporal dynamics of these processes are poorly understood in intensively managed agricultural catchments.
Purpose Of The Study
- To investigate the coupling mechanisms and hysteretic responses of the runoff-sediment-nutrient continuum.
- To analyze the impact of anthropogenic perturbations on these dynamics in an agricultural watershed.
Main Methods
- Utilized multi-source daily monitoring data from 2007-2022.
- Employed change-pattern analysis, change-point detection, and scale-sensitive correlation analysis.
- Integrated spatial nutrient analysis and examined relationships between precipitation, runoff, sediment, and nutrients.
Main Results
- Runoff showed no significant long-term trend due to reservoir regulation and precipitation homogenization.
- Sediment load decreased by 74%, with a 5-year lag observed between sediment dynamics and precipitation.
- Nutrient concentrations varied spatially, with downstream total nitrogen (TN) exhibiting significant fluctuations.
Conclusions
- Agricultural and hydraulic infrastructure significantly reconfigure material translocation dynamics.
- Findings offer guidance for adaptive water-nutrient management and sediment control in regulated agricultural watersheds.
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