| Cite this article: | 常晓敏,王少丽,管孝艳,等.湟水流域典型区农业面源污染特征解析及空间格局[J].灌溉排水学报,2023,():-. |
| changxiaomin,wangshaoli,guanxiaoyan,et al.湟水流域典型区农业面源污染特征解析及空间格局[J].灌溉排水学报,2023,():-. |
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| DOI： |
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| Analysis of agricultural non-point source pollution characteristics and spatial pattern in typical areas of Huangshui Basin |
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changxiaomin1, wangshaoli1, guanxiaoyan1, huangjiasheng2, jiahaifeng2, youlijun1
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1.China Institute of Water Resources and Hydropower Research;2..Qinghai water conservancy and Hydropower Research Institute
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| Abstract: |
| In order to clarify the temporal and spatial evolution characteristics of agricultural non-point source pollution emission and its pollution sources contribution in Huangshui basin, the emission coefficient method was used to quantitatively estimate the emission amount and intensity of total nitrogen (TN), total phosphorus (TP), chemical oxygen demand (COD) and ammonia nitrogen (NH3-N) of 16 sub-units in the upstream control area of xiaoxiaqiao section of in the typical area of Huangshui main stream from 2010 to 2018, and then the methods of temporal and spatial analysis and cold and hot spot analysis were used to systematically analyze the temporal and spatial evolution and spatial pattern of different types of agricultural non-point source pollution. The results showed that: 1) in terms of time, the pollutant emissions from livestock and poultry breeding sources and rural living sources showed an increasing trend, while the planting sources showed a decreasing trend; The emissions and intensity of TN, COD and NH3-N increased, while TP decreased slightly; 2) In terms of spatial distribution, the emission intensity distribution of four types of pollutants is relatively concentrated, which is smaller in the Xiameng bridge and Jintan cross-section area, and higher as a whole after entering Xinning bridge section; The contribution rate of emission load is livestock and poultry breeding source > rural living source > planting source, in which COD is the primary pollutant; 3) From the analysis of cold and hot spots, the hot spots are mainly distributed in Qiaotou bridge, Xinning Datong bridge, Xigang bridge and the east area of Xining, and the cold spots are mainly distributed in Jintan and Sanqi bridge. The overall intensity of pollutant emission has increased slightly, but the degree of pollutant concentration in some areas has weakened. The degree of agricultural non-point source pollution and main pollution sources are different in various regions. In terms of prevention and control measures, we should focus on the pollution of livestock and poultry breeding industry, especially the emission reduction of COD; In terms of key prevention and control areas, we should focus on the areas after entering the xinningqiao section, so as to provide theoretical basis and ideas for the prevention and control of agricultural non-point source pollution in Huangshui basin. |
| Key words: Huangshui River Basin; Agricultural non-point source pollution; Temporal and spatial evolution; Cold and hot spot analysis; Prevention and Control Countermeasures |
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