江淮丘陵区水土保持措施对坡耕地土壤侵蚀和养分流失的影响研究

作     者：Purevjav Nyambayar 

作者单位：安徽农业大学 

学位级别：硕士

导师姓名：胡宏祥;叶寅

授予年度：2020年

学科分类：082802[工学-农业水土工程] 090707[农学-水土保持与荒漠化防治] 0907[农学-林学] 08[工学] 0828[工学-农业工程] 09[农学] 0815[工学-水利工程] 

主      题：soil erosion runoff nutrient loss sediment loss nutrient concentration 

摘      要：Soil and water conservation(SWC)practices have been long-time recognized as a tackle to soil erosion,and maintain sustainable agriculture on sloping ***-point source pollution has become one of the key concerns in the polluted environment of river basins in ***,most of the studies focused on the individual character of soil erosion or nutrient losses in short slope *** study expected to investigate soil and nutrient loss by eroded sediment and runoff flux,and an effect of these practices to crop yield in the long slope plots.A total of 12 plots were included in this study that was assigned to four treatments(20m x 4m,gradient 15°):Control(C),contour farming(CF),Contour farming with mulch(CM),and Contour farming with hedgerow(CH).The runoff volume and sediment yield,their concentration,rainfall were monitored by a period of the rainy season in *** the experimental test,25 rainfall ranged from 0.4 to 85.82 mm with fell 255.02 mm of *** main factor in soil erosion and nutrient losses are directly related to precipitation and its *** analysis shows that for all treatments,there were highly significant and positive correlation between rainfall and runoff(r2=0.95-0.97,P0.01),and between rainfall and soil loss(r2=0.98-0.99,P0.01)The seasonal average runoff loss ranged between 63.42 and 472.06 m3/ha,with an average was 272.32 m3/*** results exposed that the amount of nutrient and sediment loss in the runoff plots,compared to the control treatment was much *** result of contrast tests in ANOVA(t=24.70 d.f.=8,P0.05)indicated that runoff losses in the CH and CM fields were performed excellently to preventing runoff loss,followed by CF treatment,compared with the C *** contrast,the sum of runoff loss in each treatment decreased by a minimum of 17.05%,86.56%,and 65.62%,*** seasonal soil loss range of C was 369.79-3668.02 kg/ha,with an average 1724.98 kg/*** C treatment soil