贵州花江喀斯特峡谷水土流失状态分析

选取能较好反映喀斯特峡特征的花江峡谷作为研究对象，采用埋桩、修建沉沙及充分利用当地沟谷谷坊等手段相结合的方法，集中讨论了花江喀斯特峡谷水土流失的现状和特点。一方面，研究区的土壤侵蚀量远小于大多数非喀斯特地区，但并不是说喀斯特峡谷地区的水土流失不严重，相反，这正是水土流失发展到极其严重地步的必然现象，另一方面，流域的土壤侵蚀强度还受其内部岩性结构的影响碎屑岩的比重越大，土壤侵蚀模数也越大。同时，对不同天然植被条件下的土壤侵蚀监测发现，通过种草来减轻峡谷地区的土壤侵蚀是一条十分有效的途径。

On the Present Soil Erosion Situation of Huajiang Karst Gorge in Guizhou Province

karst rcgion is a special kind of region,and dirreent in many aspects of soil erosion compared with non karst area.It's well known that Guiahou is a typicai karst province,whose most important geomorphological units are composed of plateau area and gorge area.and pays yts main attention to discussing present situation and reatures of woil erosion of Huajiang gorge,by the means of combination with burying stake,building sanb deposited pool and making rull use of sediment trapping dam.On the one hand,the amount of soil erosion of the sample area is much less than that of most non karst areas,but it doesn't mean that the soil erosion of darst gorge is not serious,on the contrary,it is a symbol that soil erosion in these areas is in the serious statwe;on the other hand soil erosion intetsity of a drainage area is inrluenced by its rock structure,the larger the ratio of fragment rock is,the bigger the soil erosion modulus will be,Meanwhile,through monitoring the soil erosion under the condition of different vegetation,it is demonstrated that it's a valid way to alleviate the soil erosion of karst gorge area by planting grassland.