百喜草人工植被对坡面径流的影响

  为研究百喜草(Paspalum notatum Flugge)及其凋落物水源涵养作用,采用土壤水分渗漏装置进行试验,得到不同处理的地表和土壤径流深。结果表明:不同处理小区的径流组成有很大差异,A(百喜草覆盖处理小区)、B(百喜草敷盖处理小区)、C(裸露对照处理小区)各处理的总径流深分别为1245.24、1453.81和1383.23mm,其中,地表径流深分别为24.46、50.2和592.07 mm,土壤径流深分别为1220.78、1403.61和791.16mm;A、B、C各处理的地表径流深与降雨量拟合最优经验方程均为二次抛物线型方程,相关系数分别为0.933、0.861和0.810,方程均达极显著性相关;方差分析结果显示,不同处理的地表径流深存在显著性差异。

Effects of artificial vegetation of Paspalum notatum Flugge on slope runoff

In order to study the effects of Paspalum notatum Flugge and its ground cover on water conservation,the experiment was carried out by Lysimeter and the depth of surface runoff and subsurface flow was gained for different treatments.The results indicated that,runoff components have obvious differences because of different treatments.The total depth of runoff in treatment A(coverage of Paspalum notatum Flugge),B(mulching of Paspalum notatum Flugge),C(bare slopeland) was 1 245.24,1 453.81 and 1 383.23 mm respectively,of which the depth of surface runoff was 24.46,50.2 and 592.07 mm respectively,while the depth of subsurface flow was 1 220.78,1 403.61 and 791.16 mm respectively.The empirical equations in treatment A,B,C are parabola,the relative coefficient of which is 0.933,0.861 and 0.810 respectively between the depth of surface runoff and precipitation.The analysis results showed that the differences of the depth of surface runoff are very significant between different treatments.