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Related Experiment Video

Updated: Jun 6, 2026

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

[Impacts on nutrient export by landscape heterogeneity based on sub-watershed].

Zhao-Fu Li¹, Hong-Yu Liu, Heng-Peng Li

¹College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China. lizhaofu@njau.edu.cn

Huan Jing Ke Xue= Huanjing Kexue

|November 16, 2010

Summary

Landscape features significantly impact non-point source (NPS) pollution. Forest cover reduces nutrient export, while cultivated land increases it, informing watershed management strategies.

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Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds

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Watershed Planning within a Quantitative Scenario Analysis Framework

Watershed Planning within a Quantitative Scenario Analysis Framework

Published on: July 24, 2016

Area of Science:

Environmental Science
Hydrology
Geographic Information Systems (GIS) and Remote Sensing (RS)

Context:

Watershed landscape characteristics are critical drivers of non-point source (NPS) pollution.
The Xitiaoxi watershed, situated in the upper reaches of the Taihu Lake region, was selected for this study.
Understanding landscape-watershed interactions is vital for managing water quality.

Purpose:

To delineate sub-watershed boundaries and analyze landscape heterogeneity using GIS and RS.
To estimate nutrient export intensity within sub-watersheds using a revised export coefficient model.
To investigate the relationships between nutrient export, dominant landscape types, and landscape diversity.

Summary:

Total Nitrogen (TN) and Total Phosphorus (TP) export intensities exhibit significant spatial variation, ranging from 3.01 to 15.44 kg/(hm²·a) and 0.049 to 0.355 kg/(hm²·a), respectively.
Cultivated land and forest land were identified as key landscape types quantitatively influencing nutrient export. An increase in forest area correlated with decreased TN and TP export, while increased cultivated land led to higher export.
The relationship between nutrient export intensity and Shannon Diversity Index (SHDI) followed a second-degree polynomial pattern, peaking at SHDI = 1.5 before declining.

Impact:

Provides quantitative data on how landscape composition affects nutrient export, crucial for targeted NPS pollution control.
Offers valuable insights for developing effective watershed management strategies to mitigate pollution in the Taihu Lake basin.
The findings serve as a significant reference for policymakers and environmental managers focused on improving water quality through landscape planning.