喀斯特峡谷区不同等级石漠化土壤侵蚀对比研究--以贵州花江示范区为例

利用侵蚀线法、谷坝监测法对花江示范区的土壤侵蚀量作监测,同时就土壤侵蚀因子进行系统性、相关性和层次性研究,进行不同等级石漠化下的土壤侵蚀因子的对比,归纳各土壤侵蚀因子对土壤侵蚀的影响。结果指出林—草结构的保土保水能力优于单一林地的保土保水能力;从潜在石漠化到中度石漠化地区,土层根系量与侵蚀量呈负相关;从潜在、无明显、强度、轻度、直至中度石漠化,其侵蚀厚度依次增加,中度和轻度这两种等级的石漠化现存的土层较厚,土壤侵蚀模数也较大。

A contrasting study on soil erosion under different rock desertification grads in karst gorge areas--A case study of the Huajiang demonstration area,Guizhou

The way of drawing erosion line and sediment trapping dam was used to measure soil erosion of the Huajiang demonstration area.Simultaneously,on the factors of soil erosion,system,relativity and hierarchy researches were contrasted.We contrasted the factors under different grade of rock desertification to sum up the effects by those factors.The results showed that the capabilities of water and soil conservation and the forest-grass structure were superior to single forestland.From potential rock desertification to medium rock desertification,the amount of root system was minus-correlative with the amount of soil erosion.From potential,non-obvious,intensive,light,and finally to medium rock desertification,the thickness of soil erosion increased gradually.Furthermore,the presentsoil thickness of the medium and light rock desertification was relatively great, the modulus of soil erosion was relatively large as well.