近百年来岱海湖面变化的特点及对自然环境变化的指示意义

THE CHANGE OF DAIHAI LAKE SURFACE DURING THE PAST ONE CENTURY AND ITS INDICATION SIGNIFICANCE FOR NATURAL ENVIRONMENT

利用1881～1986年间岱海的水位资料,分别对近100a和近30a时段内湖面变化特点进行了分析,并将湖泊水量收支平衡与中亚有代表性的山地冰川物质平衡进行了对比。指出:中国北方东,西部环境变化受控于不同的气候变化模式,西部以内陆性气候下冷湿、暖干配置为特点;东部则以季风气候下冷干、暖湿配置为特点。两者的差异可清楚地反映在近100a时段的变化中。2种模式间的界线则随全新世以来季风气候范围的波动性萎缩而逐渐波动东移,现代季风气候与内陆气候的过渡带处于岱海和青海湖之间,为一易灾多灾的地带。

The lake-leve data of DaiHai are used to analyse the character istic of the lake surface change during the past one century, and the budget volume of DaiHai lake and the glacier mass balance in central Asia are contrasted. It's pointed out that environmental change is controlled by different models in the east and west part of the North China. The differ-ences between two models are clearly reflected in environmental change during the past one century. The boundary line between two models moves eastward fluctuately along with the shrinking of monsoon climate since the Holocene. The transitional belt of modern monsoon climate and inland climate is between DaiHai lake and QingHai lake, which is a more natural hazard region.