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| Estimates and Spatio-Temporal Characteristics of Nitrogen and Phosphorus Discharges from Agricultural Sources in Xiangxi River Basin, Xingshan County |
| Received:January 12, 2015 |
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| KeyWord:Xiangxi River basin;agricultural source;pollutant discharge coefficient;spatio-temporal characteristics |
| Author Name | Affiliation | E-mail | | CUI Chao | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | | | LIU Shen | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | liushencom@163.com | | ZHAI Li-mei | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | | | LIU Hong-bin | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | | | LEI Qiu-liang | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | | | ZHANG Fu-lin | Institute of Plant Protection, Soil and Fertilizer Sciences, Hubei Academy of Agricultural Sciences, Wuhan 430064, China | | | HUA Ling-ling | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | | | LI Wen-chao | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | |
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| Abstract: |
| Based on typical investigation and statistical analysis, the discharge loads of TN and TP from agricultural sources in the Xiangxi River basin, Xingshan County during 2007 to 2013 were estimated using pollutant discharge coefficient approach. The intensity and spatio-temporal pattern of three main types of agricultural non-point sources, rural domestic source, animal production and crop production, were also analyzed. The annual TN and TP discharges were 1 145.2 t·a-1 and 56.5 t·a-1, and their discharge intensities were 44.5 kg·hm-2·a-1 and 2.14 kg·hm-2·a-1, respectively. The agricultural source percentage of TN and TP discharges respectively increased by 38.0% and 85.1% from 2007 to 2013. The ratio of mean annual TN/TP discharge was 21:1, indicating that TN discharge was the main target of prevention and control in Xiangxi River basin. The animal production was the main source of TN discharges, accounting for 77.9% of TN discharges, while crop production was the main source of TP discharges, amounting to 55.4% of TP discharges. Shuiyuesi, Huangliang and Xiakou towns were the major sources of nitrogen and phosphorus discharges spatially. Xiakou, Gaoqiao and Huangliang towns had higher intensity of TN discharge among all the towns with Xiakou, Zhaojun and Huangliang towns being higher intensities of TP discharge. |
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