青海湖盆地沙地特征及风沙化趋势

ON THE CHARACTERISTICS OF THE SAND-LAND AND TENDENCY OF EOLIAN SANDIFICATION IN QINGHAI LAKE BASIN

在对青海湖沙地进行系统分区采样分析的基础上,结合航片判读,阐述了沙地的扩大速度及发展趋势。

The characteristics of the four sand-land regions,and their mineral components, salt and nutrient of the sand samples,and the moisture of the different parts of the dunes,as well as the tendency of the sandidification are analysed by using the date from field survey and remote sensing in Qinghai Lake basin.The speed of the sandification is different from each other in the four sand-land regions.The sand-land types are of di- versiform in the basin.The area of the sand-land was 436.84,484.59,712.26km^2 re- spectively in 1956,1972,1986.The mineral components of sand are quartz,feldspar and carbonate and so on.The contents of salt and untrient in different parts of dunes are similar in the eastern region of Qinghai Lake,but the moisture is remarkably different. The sandification speeds were 9.18,3.01,16.24km^2/a respectively in 1956—1968,1968 —1972,1972—1986.The sandification of the eastern sand-land is toward the Riyue Mountain location on the east of the lake,while that of the Bird Island is toward the NE direction.