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Reduction of runoff and soil loss over steep slopes by using vetiver hedgerow systems

机译：使用香根草篱笆系统减少陡坡上的径流和土壤流失

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摘要

Vetiver hedgerow system has potential for reducing runoff and soil loss especially on steep slope areas, but the dynamics of these reductions are not fully understood. This research was conducted to determine reduction in runoff and soil loss by vetiver hedgerow system. Vetiver hedgerow systems with three vertical intervals of hedgerow were tested on three land slopes and compared with the case without hedgerow for six simulated rainfall amounts. The vetiver hedgerows reduce runoff volume and soil loss by 31-69 and 62-86 %, respectively compared to the case without vetiver hedgerow. Runoff volume increases with rainfall amount, and hence increases soil loss. Therefore soil loss increases with land slope, runoff volume, rainfall amount, and vertical hedge interval. Two final equations for estimating soil loss are presented in this study. The first equation contains parameters of runoff volume, land slope, and vertical hedge interval, while the second equation contains rainfall amount instead of runoff volume. The correlation coefficients between estimated soil losses and the experimental data in this study and in the literatures were found to be 0.94 and 0.90 for the first and second equations, respectively.
机译：香根草树篱系统具有减少径流和土壤流失的潜力，尤其是在陡坡地区，但是这些减少的动态还没有被完全了解。这项研究是为了确定香根草树篱系统减少的径流和土壤流失。在三个坡度上测试了具有三个垂直间隔的树篱的香根草树篱系统，并与没有树篱的情况进行了比较，得出了六个模拟降雨量。与没有香根草篱的情况相比，香根草篱减少了31-69％和62-86％的径流量和土壤流失。径流量随降雨量增加而增加，因此增加了土壤流失。因此，土壤流失随土地坡度，径流量，降雨量和垂直绿篱间隔而增加。这项研究提出了两个估计土壤流失的最终方程。第一个方程式包含径流量，坡度和垂直树篱间隔的参数，而第二个方程式包含降雨量而不是径流量。在本研究和文献中，估计的土壤流失与实验数据之间的相关系数对于第一个和第二个方程分别为0.94和0.90。

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