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采用流域尺度的农业非点源污染模型——AnnAGNPS模拟预测苕溪流域四岭水库小流域氮磷流失情况,分析氮磷流失空间分布特征.结果表明,单位面积总氮、总磷流失量在空间分布上有一定的相似性,均呈现出南部大于北部,西部高于东部的特点.以竹林地为主的林地是氮磷输出的最主要来源,其对氮、磷流失总量的贡献率在90%以上.设定不施肥处理(CK)、适地养分管理(SSNM)、当地高产竹农普遍采用的施肥方法(FFP)这3种施肥方式对林地主要植被类型竹林进行情景分析,模拟结果表明,与FFP相比,SSNM在一定程度上减少了氮磷输出,其中溶解性氮和颗粒态氮流失量分别削减8.17%、4.33%,溶性磷和颗粒态磷流失量依次减少9.08%、1.02%.
The model of agricultural non-point source pollution in catchment scale-AnnAGNPS was used to simulate the nitrogen and phosphorus loss in the watershed of the SiLing reservoir in the Tiesi Basin, and the spatial distribution characteristics of nitrogen and phosphorus loss were analyzed. The results showed that the total nitrogen and total phosphorus loss per unit area was in the spatial distribution Have the same characteristics, showing the southern greater than the northern, western higher than the eastern characteristics of mainly bamboo forest is the main source of nitrogen and phosphorus output, its contribution to the total nitrogen and phosphorus losses in the 90 % .The above three kinds of fertilization methods were applied to set up scenarios of non-fertilization treatment (CK), proper nutrient management (SSNM) and fertilization method (FFP) commonly used by local high-yield bamboo farmers, and the simulation results showed Compared with FFP, SSNM reduced the output of nitrogen and phosphorus to a certain extent, and the dissolved nitrogen and particulate nitrogen loss decreased by 8.17% and 4.33% respectively. The soluble phosphorus and particulate phosphorus loss decreased by 9.08% and 1.02% .