摘要
根据全新世沉积重矿物组合与古土壤养分分析的结果,认为毛乌素沙地全新世沉积环境有过多次正逆变化:11-10kaB。P.、8500-5000aB,P.、4000-3500aB.P.、2700-2000aB,P.以及1500-1000aB.P.时期气候较为潮湿,土壤、植被发育较好,化学风化作用较强,风沙活动受到限制,为相对低能的沉积环境。介于其间的时期则分别为机械风化作用占优势的高能沉积环境,土壤风蚀严重,气候较为干燥。
Based on analysing the contents and characteristics of sedimentary heavy mineral,organic matter,total nitrogen and phosphorus in Holoce ne de posits,this paper deals with theenvironmental changes of Mu Us Sand Sea, which lies in the temperate and semi-arid steppe zone.The results show that the climate was relatively humid ,soil and vegetation cover were better and themobilities of sand dunes were limited during the peried of 11-10 ka B.P.,8 500-5000 a B.P.4000-3500 a B.P.,2 700-2000 a B.P. and 1 500-1000 a B.P. respectively. While themechanical weathering was dominent:wind sand activities were frequent;vegetation was sparse,soil ercoion was serious and the climate was dry during the interval periods mentioned above.
出处
《中国沙漠》
CSCD
北大核心
1994年第3期1-9,共9页
Journal of Desert Research
基金
兰州地质所生物气体地球化学开放实验室资助项目
关键词
毛乌素沙地
重矿物组合
环境变迁
Mu Us Sand Sea Heavy mineral assemblage Climatic changes