Spatio-temporal variations of nitrogen in an agricultural watershed in eastern China: Catchment export, stream attenuation and discharge
Spatio-temporal variations of nitrogen in an agricultural watershed in eastern China: Catchment export, stream attenuation and discharge
复制标题
中国东部农业流域氮时空变化：流域出口、径流衰减和流量
DOI：
10.1016/j.envpol.2011.04.023
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发表时间：
2011-10-01
影响因子：
8.9
通讯作者：
Deng, Ouping
中科院分区：
文献类型：
--
作者：
Chen, Dingjiang;Lu, Jun;Deng, Ouping
利用2004 ~ 2008年长乐水系水文地球化学月均资料，利用已有的径流养分输运方程逆式和正式分别估算了非点源输往河道的总氮（TN）输运负荷（S-n）和径流输运负荷（A(L)）。估算Sn对水系TN的贡献为96 +/- 2%，而A(L)平均减少了23 +/- 14%。高流量期全水系的流内TN衰减效率平均为10 +/- 5%，远低于低流量期的39 +/- 17%。支流TN衰减效率（平均28 +/- 16%）远高于主流（11 +/- 8%）。水文条件是决定NPS总氮输出、径流衰减和排放时空分布的重要因素。增加水停留时间可能是缓解水流TN的实用方法。(C) 2011 Elsevier Ltd.。版权所有。
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.