黄河源区多年冻土退化及其环境反映  

Permafrost Degradation and Its Environmental Sequent in the Source Regions of the Yellow River

作　　者：张森琦[1] 王永贵[1] 赵永真[2] 黄勇[1] 李永国[1] 石维栋[1] 尚小刚[1] 

机构地区：[1]青海省地质调查院,青海西宁810012 [2]青海省国土资源厅,青海西宁810012

出　　处：《冰川冻土》2004年第1期1-6,共6页Journal of Glaciology and Geocryology

基　　金：中国地质调查局"黄河源区1:25万生态环境地质调查"项目(19991230004121)资助

摘　　要：基于黄河源区多年冻土退化引起的生态环境地质问题与效应的实际资料,明确了多年冻土的生态环境功能和多年冻土退化引起的危害.提出多年冻土退化使赋存于高寒草地和维系高寒草地生长发育的多年冻土表部的冻结层地下水水位持续下降或消失,从而引发和加剧了高寒草地的"三化"(草地退化、沙漠化和盐渍化)和水环境变异,是导致黄河源区占主导地位的高寒草甸失水向沙漠化草地和"黑土滩"型次生裸地退化的主要地质原因.From the available data of eco-environmental geology and desertification due to permafrost degradation in the source regions of the Yellow River, it is found that the eco-environment is deteriorating in permafrost regions. Permafrost degradation results in lowering or disappearing of the level of groundwater in the seasonal thawing layer, on which the growth of alpine meadow in cold regions depends. Thus, the alpine meadow in cold regions is degrading, together with water environment aggravating. It is the main reason that the alpine meadow, which holds the balance in the source regions of the Yellow River, is losing water and going to desertification.

关 键 词：多年冻土 生态环境地质 沙漠化 黄河源区 

分 类 号：P642.14[天文地球—工程地质学] P641[天文地球—地质矿产勘探]