亚博app

南京市丘陵区不同农耕措施水土保持效益
1, 1, 2, 3, 1, 1

亚博app (1.jiangsushengshuiwenshuiziyuankancejunanjingfenju, nanjing210008; 2.nanjingdaxue huanjingguihuashejiyanjiuyuangufengongsi,nanjing 210008; 3.nanshuibeidiaodongxianjiangsushuiyuanyouxianzerengongsi, nanjing 210008)

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Soil and Water Conservation Effects of Different Agricultural Measures in Mountains and Hills of Nanjing
ZHANG Zhenzhen1, SHAN Yangong1, WU Mingzhou2,

亚博app (1.nanjing branch of jiangsu hydrological and water resources survey bureau, nanjing 210008, china; 2.academy of environmental planning and design, nanjing 210008, china; 3.jiangsu water source company of south-to-north water transfer project, nanjing 210008, china)

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亚博app

备注

利用南京市桥头小流域2015—2017年日降雨量、最大30 min降雨强度I30数据和4种植被措施下径流小区的产沙量、产流量等监测数据,分析不同植被措施在64场不同类型侵蚀性降雨条件下的水土保持效益。结果 亚博app表明:(1)侵蚀性降雨主要集中在4—10月份,7月份发生频率和降雨总量都最高。(2)研究区侵蚀性降雨可分为5类,发生频率由高到低依次为:Ⅲ型(小雨量、小雨强)、Ⅴ型(中雨量、小雨强)、Ⅱ型(小雨量、大雨强)、Ⅳ型(中雨量、中雨强)、Ⅰ型(大雨量、中雨强)。(3)Ⅰ型降雨侵蚀力最大,Ⅲ型降雨侵蚀力最小,就减沙率而言,玉米地在Ⅰ型降雨条件下减沙率最好,其他类型下林地措施减沙率最好; 对于减流率,花生地在Ⅱ型、Ⅲ型、Ⅴ型3种类型的降雨条件下减流率最高,油菜地适合Ⅰ型,玉米地适合Ⅳ型。

based on the observations of the measured daily rainfall(2015—2017)data, the maximum 30-minute rainfall intensity and slope runoff and sediment yield with four vegetation measures, the effects of different types of erosive rainfall on the soil and water conservation on loess sloping land under different vegetation coverage were systematically analyzed. the results are shown as follows.(1)most of the erosive rainfall in the research area occurred in the period from april to october. the frequency of the total rainfall and the highest total rainfall concentrated in july.(2)erosive rainfall can be divided into five types. the frequency of the erosive rainfall decreased in the order: pattern ⅲ(low precipitation, low i30)>pattern ⅴ(moderate precipitation , low i30)>pattern ⅱ(low precipitation, high i30)>pattern ⅳ(moderate precipitation, moderate i30)>pattern ⅰ(high precipitation, moderate i30).(3)the erosive force of the pattern ⅰ is the largest and the erosive force of the pattern ⅲ is the lowest. the sediment reduction rate of the corn field is the highest under the types of pattern ⅰ, and the sediment reduction rate of the forestland is the highest under the other four rainfall types. the runoff reduction rate of the peanut field is the highest under the types of the pattern ⅱ, pattern ⅲ and pattern ⅴ. the runoff reduction rate of the rape field is the highest under the types of the pattern ⅰ. the runoff reduction rate of the corn field is the highest under the types of the pattern ⅳ.

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