Functions of Paddy Field Water System Units and Their Synergistic Effects in Reducing Agricultural Non-point Source Pollution
With effective control of point source pollution in China,agricultural non-point source pollu-tion has become a major environmental problem.Protecting rural ecosystems and controlling agricultural non-point source pollution are important for developing an ecological civilization and revitalizing the ru-ral regions of China.Due to excessive usage of chemical fertilizers and pesticides,agricultural chemicals not absorbed by crops enter the water environment by surface runoff,paddy field drainage and under-ground seepage,resulting in surface and groundwater pollution.Paddy fields,irrigation ditches,and ditch-pond wetlands,as integral components of the paddy field water system,play a crucial role in reducing non-point source pollution at the source and enhancing environmental self-purification.In this study,we summarized the primary functions of each unit in the paddy field water system,as well as their synergistic effects in enhancing the self-purification capacity of paddy field ecosystems and controlling agricultural non-point source pollution.Through spatial optimization and comprehensive regulation and control of each unit within the paddy field water system,the system can achieve source control,process reduction and end-of-pipe treatment of agricultural non-point source pollution,consequently improving the agricul-tural ecological environment and enhancing the environmental carrying capacity of the paddy field ecosys-tem.Recommendations for further study of the paddy field water system are also made,including the ni-trogen and phosphorus absorption capacity of each unit of the system,selecting and managing substrates and aquatic plants according to local conditions,and establishing a field detection system to explore the impact of various factors on the purification capacity of the paddy field water system.
paddy field water systemditch-pond wetlandnon-point source pollutionnitrogen and phosphorus
万方数据
维普
