Interception and Removal Mechanism of Agricultural Pollutants in Herbal Vegetation Filter Belt Based on Pollution Footprint
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Jiang Min, Nie Wenting, Pan Xiaoying, Xu Wensheng
Excessive application of pesticide fertilizers makes nitrogen and phosphorus, which are not absorbed and utilized by crops, enter the water body with surface runoff, thus causing eutrophication of rivers and lakes. Agricultural non-point source pollution has been paid more and more attention by the whole society. As an ecological engineering measure, herbaceous vegetation filter belt has significant effect in preventing and controlling agricultural non-point source pollution. In this paper, a simulated drainage experiment of surface runoff is designed, and the correlation between sediment and particulate pollutants is analyzed. Based on the concept of soil mixed layer, the transport of soil pollutants is simplified, and an estimation model of the effect of vegetation filter zone on pollutants is established. The simulated deviation of runoff and sediment concentration in the model is within 9% and 14%, indicating that the model can simulate the effect of vegetation filter belt intercepting runoff and sediment. At the same time, the simulation results show that the vegetation over-band width is linearly positively correlated with the interception rate of runoff and sediment. The purification effect of the vegetation filter belt can be evaluated based on the soil mixed layer concept and the hydrological and soil erosion model.
Herbal vegetation, Vegetation filter zone, Agricultural pollutants