等高反坡阶对昆明市松华坝水源区坡耕地氮、磷流失的影响
发布时间：2018-11-04 12:59
【摘要】：选取昆明市松华坝水源区典型小流域——迤者小流域为试验区,通过布设标准径流小区,在2009—2015年对坡耕地产流产沙及氮、磷流失情况进行长期的野外观测研究,从年际尺度上来探讨等高反坡阶对于坡耕地产流产沙及氮、磷等养分流失的影响。结果表明:等高反坡阶对于径流和泥沙的削减效果均较为明显,年平均减流率为50.64%,年平均减沙率74.99%,减沙率显著大于减流率;等高反坡阶对于径流和泥沙中氮、磷均有较为明显的削减效果,平均每年可以削减68.75%的氮流失和82.16%的磷流失,其中对径流中总氮和泥沙中全氮年削减率分别达到59.51%和76.43%,对径流中总磷和泥沙中全磷年削减率分别达到64.22%和83.73%。
[Abstract]:In this paper, a typical small watershed in Songhuaba Waterhead area of Kunming City is selected as the experimental area. By setting up a standard runoff plot, the long-term field observation of runoff and sediment yield and loss of nitrogen and phosphorus in sloping farmland is carried out in 2009-2015. In this paper, the effects of the equal height reverse slope rank on runoff and sediment yield, nitrogen and phosphorus loss in sloping farmland were studied on an interannual scale. The results show that the reduction of runoff and sediment is more obvious by the equal height reverse slope step, the annual average flow reduction rate is 50.64, the annual average sediment reduction rate is 74.99, and the sediment reduction rate is significantly larger than the flow reduction rate. The average nitrogen loss and phosphorus loss in runoff and sediment can be reduced by 68.75% and 82.16% per year respectively. The annual reduction rates of total nitrogen and total nitrogen in runoff and sediment are 59.51% and 76.43% respectively. The annual reduction rates of total phosphorus in runoff and sediment are 64.22% and 83.73% respectively.
【作者单位】： 东北林业大学林学院;西南林业大学生态与水土保持学院;
【基金】：国家自然科学基金项目(30660037)
【分类号】：S157
本文编号：2309885
[Abstract]:In this paper, a typical small watershed in Songhuaba Waterhead area of Kunming City is selected as the experimental area. By setting up a standard runoff plot, the long-term field observation of runoff and sediment yield and loss of nitrogen and phosphorus in sloping farmland is carried out in 2009-2015. In this paper, the effects of the equal height reverse slope rank on runoff and sediment yield, nitrogen and phosphorus loss in sloping farmland were studied on an interannual scale. The results show that the reduction of runoff and sediment is more obvious by the equal height reverse slope step, the annual average flow reduction rate is 50.64, the annual average sediment reduction rate is 74.99, and the sediment reduction rate is significantly larger than the flow reduction rate. The average nitrogen loss and phosphorus loss in runoff and sediment can be reduced by 68.75% and 82.16% per year respectively. The annual reduction rates of total nitrogen and total nitrogen in runoff and sediment are 59.51% and 76.43% respectively. The annual reduction rates of total phosphorus in runoff and sediment are 64.22% and 83.73% respectively.
【作者单位】： 东北林业大学林学院;西南林业大学生态与水土保持学院;
【基金】：国家自然科学基金项目(30660037)
【分类号】：S157
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1 范厚明,付业春;试论反坡梯土在水土保持中的地位和作用[J];中国农学通报;2004年02期
，本文编号：2309885
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