%0 Journal Article
%T COMPARATIVE STUDIES OF THE CLIMATIC INDICATORS INFERRED FROM AEOLIAN SEDIMENTS IN THE DESERT REGIONS OF NORTHERN CHINA<br>中国北方风沙沉积物气候代用指标对比研究
%A Li Chaozhu
%A Yang Xiaoping
%A <br>李朝柱
%A 杨小平
%J 第四纪研究
%D 2004
%I 
%X In this study we examined samples of aeolian sediments along the north-south transects crossing the Badain Jaran Desert of western Inner Mongolia and the Onqin Daga Sandy Land located in the eastern part of the Inner Mongolia, respectively. The grain size was measured via dry sieving, and the carbonate content by means of an Eijkelkamp instrument. The sieving results show that the sand grains of the Badain Jaran Desert are coarser and better sorted than those of the Onqin Daga Sandy Land. Besides, the frequency curves of the sediments from the Badain Jaran Desert show a kind of distinct double peaks, presumably associated with the alternative transportations of summer and winter monsoons in the north boundaries of the summer monsoon. The differences of grain size parameters between the Badain Jaran and the Onqin Daga can be principally attributed to the variations of aeolian dynamics and ground conditions from west to east in northern China. The fine sands in the Onqin Daga Sandy Land may be in part caused by the pedogenesis occurring under the relatively humid conditions. Climate was suggested to be the main factor making the differences in the grain size parameters between these two areas. It was found out that the carbonate content is higher in the Badain Jaran than in the Onqin Daga. This arose presumably from the differences in humidity. In the Badain Jaran Desert the carbonate content increases from north to south, consistent with precipitation changes along the N-S transect. However, the comparison between these two desert areas indicates that the carbonate contents in arid zones may decline if the mean annual rainfall reaches a certain threshold.
%K arid zone
%K sandy desert
%K sandy land
%K climate indicator
%K northern China<br>沙漠
%K 沙地
%K 代用指标
%K 中国北方
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=EA07051745CDC8D89D5F01A3A4CFE6A9&aid=74D3EF07B15FB710&yid=D0E58B75BFD8E51C&vid=B91E8C6D6FE990DB&iid=E158A972A605785F&sid=8F2250DA83AF77B8&eid=8143FF92EEF26F96&journal_id=1001-7410&journal_name=第四纪研究&referenced_num=1&reference_num=11