Risk Prevention and Control for Agricultural Non-Point Source Pollu-tion Based on the Process of Pressure-Transformation-Absorption in Chongqing,China

• 作者: ZHU Kangwen CHEN Yucheng ZHANG Sheng YANG Zhimin HUANG Lei LEI Bo XIONG Hailing WU Sheng LI Xixi
• 来源期刊: 中国地理科学（英文版）
• 年，卷（期）: 2021,（4）
• 页码范围: 735-750
• 页数: 16页
• 语种: 英文

摘要

According to China's second national survey of pollution sources,the contribution of agricultural non-point sources(ANS)to water pollution is still high.Risk prevention and control are the main means to control costs and improve the efficiency of ANS,but most studies directly take pollution load as the risk standard,leading to a considerable misjudgment of the actual pollution risk.To ob-jectively reflect the risk of agricultural non-point source pollution(ANSP)in Chongqing,China,we investigated the influences of initial source input,intermediate transformation,and terminal absorption of pollutants via literature research and the Delphi method and built a PTA(pressure kinetic energy,transformation kinetic energy,and absorption kinetic energy)model that covers 12 factors,with the sup-port of geographical information system(GIS)technology.The terrain factor calculation results and the calculation results of other factors were optimized by Python tools to reduce human error and workload.Via centroid migration analysis and Kernel density analys-is,the risk level,spatial aggregation degree,and key prevention and control regions could be accurately determined.There was a posit-ive correlation between the water quality of the rivers in Chongqing and the risk assessment results of different periods,indirectly re-flecting the reliability of the assessment results by the proposed model.There was an obvious tendency for the low-risk regions trans-forming into high-risk regions.The proportion of high-risk regions and extremely high-risk regions increased from 17.82％and 16.63％in 2000 to 18.10％and 16.76％in 2015,respectively.And the risk level in the main urban areas was significantly higher than that in the southeastern and northeastern areas of Chongqing.The centroids of all grades of risky areas presented a successive distribution from west to east,and the centroids of high-risk and extremely high-risk regions shifted eastward.From 2000 to 2015,the centroids of high-risk and extremely high-risk regions moved 4.63 km(1.68°)and 4.48 km(12.08°)east by north,respectively.The kernel density analys-is results showed that the high-risk regions were mainly concentrated in the main urban areas and that the distribution of agglomeration areas overall displayed a transition trend from contiguous distribution to decentralized concentration.The risk levels of the regions with a high proportion of cultivated land and artificial surface were significantly increased,and the occupation of cultivated land in the pro-cess of urbanization promoted the movement of the centroids of high-risk and extremely high-risk regions.The identification of key areas for risk prevention and control provides data scientific basis for the development of prevention and control strategies.