吉兰泰盐湖的演化趋向

THE EVOLUTION TREND OF THE SALT-LAKE IN JILANTAI AREA, INNER MONGOLIA

通过对吉兰泰盐湖形成与演化的研究,在分析现代盐湖地貌特征、盐类化学特征、地下卤水下降、流沙侵湖和人为因素叠加影响的基础上,指出了吉兰泰盐湖自干盐湖中期直接向沙下盐湖转化的演化趋向和原因.认为人类在盐湖区无节制地采樵和过度放牧,是造成荒漠生态环境破坏,并导致干盐湖过早过快地向沙下盐湖转化的触发因素,不利的干旱气候条件则进一步加剧了这一恶化过程.

By the research on the formation and evolution of Jilantai salt-lake based on analyses of the contemporary salt-lake's geomorphic characteris- tics,features of salt chemistry,and overlapping influences of the descending of underground brine,the intruding of the running sands into the lake and the other artificially imposed factors on the salt-lake,the authors point out the evolutionary direction,in which Jilantai salt-lake was directly trans- formed from middle salt playas phase into undersand salt-lake stage,and meanwhile it is explained in this paper why this process occured.It is thought that the unrestricted felling of woods by man and excessive herding of animals near by lake area is the trigger to destroy the ecological environ- ment in desert zone,and to lead to transform the lake from salt playas into undersand salt-lake excessively early and fast.And further,the harm- ful dry climate aggravated the process.