北疆干旱区500年来环境演变序列

Environmental Deuelopment Succession of Northern Xinjiang in the Last 500 Years

笔者选用巴里坤湖湖滨浅滩60cm深的剖面,进行了综合分析,并结合^(210)Pb测年和树木年轮年代学研究,获得了沉积地层、生物地层、地球化学元素与冰川进退、湖面波动近于一致的相关变化,反映了湖积层中物理、生物、化学过程的相互作用,是500年来气候与环境演变序列的最好见证。北疆500年来经历了三个冷湿期,四个暖干期的变化过程。三次冷湿期主要出现在1560—1660年,1735—1815年和1862—1960年,并与500年来全球变化相吻合。

Combining with 210Pb chronologies and tree-ring chronology. We made a comprehensive analysis with shallow cross-sections of 60cm depth in Balikun lakeside. We obtained about the unanimous correlated variations of deposit-strata, biological strata, geochemical elements, advance and retreat of glaciers and fluctuation of lake surface, which is a reflection of physical, biological and chemical processes in lake depositstrata. During thelast 500 years,Northern Xinjiang experienced 3 cold and moisture periods, 4 warm and dry periods. The three cold and moisture periods (1560-1660A. D, 1735 - 1815A. D, 1862 -1960A. D) coincided with thoseof the global in the last 500 years.