Application status and prospect of field ridge in agricultural non-point source pollution treatment

Agricultural non-point source (AGNPS) pollution has become one of the main factor affecting the continuous improvement of water environment quality in China. Nitrogen and phosphorus pollutants from agricultural planting account for about a quarter of the total amount of water pollutants. Agricultural planting pollutants migrate to receiving water bodies mainly through runoff, lateral infiltration and infiltration. As one of the important components of the farmland environment, the ridge is the first treatment facility for pollutants in the field to enter the receiving water body. Field ridge can effectively reduce runoff, lateral seepage and soil erosion, and ultimately reduce the amount of planting pollutants directly discharged to the water body. As an economical and simple AGNPS control technology, it also has the basic conditions for widespread use. Based on extensive literature review, the existing research results of field ridges at home and abroad were systematically combed from the perspective of AGNPS pollution control, the research status of field ridges were summarized, the main ways of pollutant removal by field ridges were expounded, the possible mechanisms of pollutant removal by field ridges were analyzed, and finally discussed the problems that need to be paid attention to when it is widely used, in order to promote the in-depth study and standardized application of field ridge technology, and to provide technical support for AGNPS pollution control in China.