摘要
黄河源头地处青藏高原腹地,属中纬度高山多年冻土带。利用多年气温、钻探及冻土观测资料等,对气候变化、降水、地下径流、植被覆盖程度以及人类活动等进行了分析,找出了多年冻土退化的影响因素,并分析了冻土变化趋势。结果表明:气温的升高是导致黄河源区多年冻土退化的根本原因,地下径流、植被覆盖程度、冻土自身结构以及人类活动是其退化的影响因素;局部多年冻土层厚度减薄乃至消失,多年冻土上界下降、下界上升,分布范围缩小是多年冻土退化的趋势。
The Yellow River source is situated in the hinterland of Qinghai-Tibet Plateau,belonging to middle latitude mountainous permafrost zone.The paper analyzes climate variation,precipitation,ground runoff,degree of plant vegetation and human activities by using the observed data of longterm temperature,drilling and frozen earth,finds out affecting factors for degeneration of ever-frost and analyzes the tendency of variation of frozen earth. The outcomes show that the increase of temperature is the basic reason for causing degeneration of ever-frost of the headwater region of the Yellow River;ground runoff,degree of plant vegetation,self structure of frozen earth and human activities are the affecting factors of degeneration and;the thinning and disappearing of local ever-frost,the decrease of upper limit and increase of lower limit of ever-frost and the reduction of distribution scope are the tendency of ever-frost degeneration.
出处
《人民黄河》
CAS
北大核心
2009年第6期10-12,124,共3页
Yellow River
关键词
黄河源头
多年冻土
退化原因
变化趋势
source of the Yellow River
ever-frost
reasons of degeneration
tendency of variation
