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Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds

Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds

Published on: September 26, 2017

Landscape patterns regulate non-point source nutrient pollution in an agricultural watershed.

Jianhong Wu¹, Jun Lu²

¹College of Environment and Natural Resources, Zhejiang University, Hangzhou 310058, China.

The Science of the Total Environment

|March 19, 2019

Summary

Landscape patterns significantly impact river water quality, with distinct effects in dry and rainy seasons. Key landscape metrics like forestland and farmland patch indices predict abrupt water quality changes, crucial for watershed management.

Keywords:

Abrupt change analysis Landscape pattern Non-point source pollution Redundancy analysis Water quality Watershed

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Area of Science:

Environmental Science
Hydrology
Ecology

Background:

Landscape patterns influence hydrological cycles and non-point source pollution.
Quantitative relationships between landscape metrics and river water quality are not well understood.
Abrupt changes in river water quality along landscape metric gradients require further investigation.

Purpose of the Study:

To reveal the quantitative relationship between landscape pattern metrics and river water quality.
To explore abrupt changes in river water quality with varying landscape pattern gradients.
To differentiate the impacts of landscape patterns on water quality between dry and rainy seasons.

Main Methods:

Redundancy analysis
Nonparametric deviance reduction approach
Bootstrap sampling
Statistical analysis of 13 sub-watersheds in eastern China

Main Results:

Landscape patterns significantly affect river water quality, explaining 71.1% (dry season) and 55.3% (rainy season) of variance.
Configuration metrics were stronger predictors of water quality variance than composition metrics.
Largest patch index of forestland (LPIfor) and farmland (LPIfar) were key indicators, with critical thresholds identified for abrupt water quality shifts.

Conclusions:

Landscape configuration, particularly forestland and farmland patch sizes, critically influences river water quality.
Specific thresholds for LPIfor (<35%) and LPIfar (>50%) indicate potential for abrupt water quality degradation.
Findings are vital for effective watershed management and pollution control strategies.