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植被在有效控制水土流失、改善生态环境中具有重要作用。为探讨坡面不同植被覆盖度、不同植被空间布局对坡沟系统侵蚀产沙的影响,以4 m长坡面(坡度为20°)和3 m长沟坡(坡度为50°)组成的坡沟系统为研究对象,采用不同放水流量(3.2 L/min、5.2 L/min)的放水冲刷实验,研究了不同放水流量、不同植被覆盖度、不同植被布设部位对坡-沟系统及沟坡侵蚀产沙的影响。结果表明,在实验条件下,不同植被布设部位在相同放水流量、相同植被覆盖度条件下对坡沟系统侵蚀产沙有明显影响,而对产流量无明显影响;沟坡部分侵蚀产沙量不随坡面植被覆盖度的增大而减小,相反呈增大趋势。说明在实验条件下,对坡沟系统而言,仅在坡面部分布设植被,尽管能在一定程度上减少坡沟系统侵蚀产沙,但并不能有效减小沟坡部分的侵蚀产沙,甚至引起沟坡部分侵蚀产沙的增大。因此,水土流失治理过程中采取有效措施进行坡沟兼治将是减少水土流失的有效手段。
Vegetation plays an important role in effectively controlling soil erosion and improving ecological environment. In order to explore the influence of vegetation coverage and vegetation spatial distribution on soil erosion and sediment yield in slope-gully system, slope with 4 m long slope (20 °) and 3 m long slope (slope 50 °) This paper studied the effects of different water discharges, different vegetation coverage, different vegetation layouts on slope-ditch system and slope erosion Impact of sediment production. The results showed that under the experimental conditions, different vegetation layout sites had obvious influence on erosion and sediment yield of slope-groove system under the same water discharge and same vegetation coverage, but had no significant effect on runoff yield; Slope vegetation coverage increases and decreases, on the contrary showed an increasing trend. It is indicated that under the experimental conditions, for the slope ditch system, the vegetation is only arranged on the slope surface. Although it can reduce the erosion and sediment production of the slope ditch system to a certain extent, it can not effectively reduce the erosion and sediment of the slope ditch and even Causing part of the erosion and sediment yield increased. Therefore, taking effective measures to control both erosion and erosion during soil erosion control will be an effective way to reduce soil and water loss.