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Related Concept Videos

Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme nitrate reductase...

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Continuous Instream Monitoring of Nutrients and Sediment in Agricultural Watersheds
12:50

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Published on: September 26, 2017

[Nitrogen non-point source pollution identification based on ArcSWAT in Changle River].

Ou-Ping Deng1, Si-Yang Sun, Jun Lü

  • 1College of Environmental Resource Sciences, Zhejiang University, Hangzhou 310029, China. auh6@qq.com

Huan Jing Ke Xue= Huanjing Kexue
|June 27, 2013
PubMed
Summary
This summary is machine-generated.

Non-point source nitrogen pollution in the Changle River watershed is primarily from nitrogen fertilizer, air deposition, and soil pools. Targeted control strategies considering spatial and temporal variations are crucial for effective management.

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Area of Science:

  • Environmental Science
  • Hydrology
  • Agricultural Science

Context:

  • The Changle River watershed in Southeast China faces significant non-point source (NPS) nitrogen pollution.
  • Agricultural activities are a major contributor to water quality degradation in the region.

Purpose:

  • To model non-point source nitrogen pollution and apportion nitrogen sources in the Changle River watershed using the ArcSWAT model.
  • To analyze the spatial-temporal distribution of NPS nitrogen export and identify critical pollution sources.

Summary:

  • The ArcSWAT model was calibrated and validated for the Changle River watershed.
  • Nitrogen fertilizer (35%), atmospheric deposition (32%), and soil nitrogen pools (25%) were identified as the main contributors to total nitrogen (TN) loading.
  • Pollution source contributions varied spatially and temporally, with different sources dominating during rainy and crop-growing seasons and across different land uses.

Impact:

  • Provides critical insights for developing targeted NPS pollution control strategies in agricultural watersheds.
  • Highlights the importance of considering seasonal and land-use specific factors in nitrogen pollution management.
  • Informs policy decisions for improving water quality and protecting riverine ecosystems.