Spatio-temporal variations of nitrogen in an agricultural watershed in eastern China: Catchment export, stream attenuation and discharge

被引：24

作者：

Chen, Dingjiang ^{[1
,2
]}

Lu, Jun ^{[1
,2
]}

Shen, Yena ^{[3
]}

Gong, Dongqin ^{[1
]}

Deng, Ouping ^{[1
]}

机构：

[1] Zhejiang Univ, Coll Environm Sci & Nat Resources, Hangzhou 310058, Zhejiang, Peoples R China

[2] Zhejiang Univ, China Minist Educ Key Lab Environm Remediat & Eco, Hangzhou 310058, Zhejiang, Peoples R China

[3] Zhejiang Prov Key Lab Subtrop Soil & Plant Nutr, Hangzhou 310058, Zhejiang, Peoples R China

来源：

ENVIRONMENTAL POLLUTION | 2011年 / 159卷 / 10期

基金：

中国国家自然科学基金;

关键词：

Nonpoint sources pollution; Total nitrogen; Water residence time; Flow regime; SURFACE WATERS; PHOSPHORUS; QUALITY; RIVER; COASTAL; LOAD; UNCERTAINTY; MANAGEMENT; RETENTION; FLOW;

D O I：

10.1016/j.envpol.2011.04.023

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Using the monthly hydrogeochemical data of ChangLe River system from 2004 to 2008, total nitrogen (TN) export load (S-n) from nonpoint sources (NPS) to stream and in-stream attenuation load (A(L)) was estimated by the inverse and forward format of an existing in-stream nutrient transport equation, respectively. Estimated Sn contributed 96 +/- 2% of TN entering the river system, while A(L) reduced the input TN by 23 +/- 14% in average. In-stream TN attenuation efficiency in high flow periods (10 +/- 5% in average for the entire river system) was much lower than that in low flow periods (39 +/- 17%). TN attenuation efficiency in tributaries (28 +/- 16% in average) was much higher than that in mainstream (11 +/- 8%). Hydrological conditions are important in determining the spatio-temporal distributions of NPS TN export, stream attenuation and discharge. Increasing the water residence time might be a practical method for mitigating stream TN. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：2989 / 2995

页数：7

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