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在农田中施用有机肥料后 ,地表径流所挟带的氮和磷可导致地表水污染。草篱可以减少径流中氮和泥沙的流失。在耕作和免耕两种情况下 ,研究 0 75m宽的窄牛尾梢草草篱对施用牛粪的地块中磷和氮流失的影响。试验布置在平均坡度为 12 %、土质为莫诺纳粉质壤土上。采用裂区设计 ,免耕和耙耕处理系统安排在主区 ,施用有机肥、无机肥处理及设草篱和不设草篱的对照处理布置在副区 ,分别在初始模拟降雨阶段和随后的多雨模拟阶段采集径流样。只有 38%的免耕小区和 6 3%耙耕小区在降水量为 6 40mm/h的初始模拟降雨阶段有径流出现。与不设草篱的对照小区相比 ,单条窄草篱可以使施用有机肥的免耕小区在多雨模拟阶段径流中的可溶性磷 ,生物有效性磷 ,颗粒态磷的含量分别降低 47% ,48% ,38% ,同时使全磷含量降低 40 % ,使NH+ 4 N的含量降低 6 0 %。窄草篱与没有草篱小区相比使耙耕小区的径流中的上述磷氮含量分别降低了 2 1% ,2 9% ,43% ,38%和 5 2 %。窄草篱对减少农田施用有机肥和无机肥后径流中磷和氮的流失具有显著的效果。
After organic fertilizers are applied to farmland, nitrogen and phosphorus entrained by surface runoff can cause surface water pollution. Grass hedge can reduce runoff nitrogen and sediment loss. Under both tillage and no-tillage conditions, the effects of 0 75 m wide narrow tail grass hedgerows on phosphorus and nitrogen loss from landfills exposed to cow dung were studied. The test was arranged on an average slope of 12% and the soil quality was on Moronite loamy soil. The split-plot design, no-tillage and rake tillage system were arranged in the main area, organic manure application, inorganic fertilizer treatment and hedgerow control and no-hedgerow control treatment were arranged in the subzone. During the initial simulated rainfall and subsequent Rainfall simulation stage to collect runoff samples. Only 38% of the no-till areas and 63% of the harrowing plots runoff at the initial simulated rainfall stage with a rainfall of 6 40mm / h. Compared with the control plot without straw hedgerows, the single narrow hedgerow can reduce the content of soluble phosphorus, bio-available phosphorus and particulate phosphorus in no-tillage plots of organic fertilizer in runoff simulation stage by 47% and 48%, respectively %, 38%, while reducing the total phosphorus content by 40%, reducing the content of NH + 4 N by 60%. The narrow-hedgerows reduced the above-mentioned P and N levels by about 21%, 29%, 43%, 38% and 52%, respectively, in runoff from raking plots compared to no hedgerow plots. Narrow hedge has a significant effect on reducing the loss of phosphorus and nitrogen in runoff after applying organic manure and inorganic fertilizer.