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植被对水土流失具有防御作用。为了验证植被对水土流失防御作用的存在和其防御作用的大小,人工堆积了面积750cm2的有植被覆盖和无植被覆盖的两堆土体,采用人工模拟降水的方法进行实验,持续10分钟左右降水,降水量为25.9mm。称量相应环节水土重量,对水土流失量和水土流失率、涵蓄水源率进行计量。发现无植被覆盖的土体水土流失率为4%,植被全覆盖的土体未有明显的水土流失现象;依据两种计算方法得出的土壤涵蓄水源率,前者为36.8%和23.6%,后者为51.3%和32.0%。实验从定量的角度验证了植被对水土流失防御作用的存在,同时提供了有植被覆盖的区域土壤涵蓄水源能力有明显提高的数据。
Vegetation has a defensive effect on soil erosion. In order to verify the existence of vegetation and its defensive effect on soil and water loss, the two piles of soil with vegetation cover and vegetation-free cover with an area of 750cm2 were artificially accumulated. Artificial simulated precipitation was used to carry out experiments for about 10 minutes of precipitation , The precipitation is 25.9mm. Weighed the corresponding part of soil and water weight, soil erosion and soil erosion rate, storage water source rate measurement. The soil erosion rate of soil without vegetation cover was 4%. There was no obvious soil erosion in the soil covered by vegetation. According to the two methods, the former was 36.8% and the other was 23.6% , While the latter was 51.3% and 32.0%. The experiment verifies the existence of the defensive effect of vegetation on water and soil loss from the quantitative point of view and at the same time provides the data that the ability of the soil in the area covered by vegetation to significantly increase the water content is obviously improved.