突发性山地灾害与土壤发生类型的相关性

Correlation Between Sudden Mountainous Disaster and Soil Genetic Types

通过对浙江省庆元县突发性山地水土灾害与土壤发生学类型作相关性研究后发现 ,红壤上灾害发生绝对量最大 ,且集中发生在红壤的黄泥土和黄壤的山黄泥土两个土属中。山地灾害发生密度以紫色土土类最高 ,次为水稻土土类 ,其中淹育型水稻土的红泥田、黄泥田和潴育型水稻土的黄泥砂田则是灾害密度最大的三个土种。粗晶花岗岩发育的砂粘质红泥本为极易滑坡的土壤 ,但在天然常绿阔叶林和毛竹林覆盖下 ,没有山地灾害发生 ,因此 ,恢复自然植被和发展材用毛竹林是防治山地灾害的最有效途径。

In this paper the correlation between sudden water and soil disasters and soil genetic types is studied in Qingyuan county. It is found that the number of disaster points on red soil is the biggest. And the disasters mainly take place on the two soil genus of yellowish red soil and mountain yellow soil. But, as to the density of mountainous disasters, purple soil tops the deveioped group, while the second is paddy soil. In all soil types, the three paddy fields developed on red soil, yellowish red soil and redeposit of red soil are the highest. Sand clayey red soil,developed from granite, should be likely to slide, but there is almost no disaster on the soil covered with broad leaved forest and bamboo grove. Hence, to avoid mountainous disaster, resuming natural vegetation or expanding bamboo grove is one of the effective approaches.