干旱区生态环境知识资源中心(Arid): 三江源区风沙沉积物的特性

Arid

	三江源区风沙沉积物的特性
其他题名	Characteristics of blown sand deposits in the Sanjiangyuan region
	李艳富 1; 王兆印 1; 余国安 2; 王春振 1
来源期刊	清华大学学报. 自然科学版
ISSN	1000-0054
出版年	2013
卷号	53 期号:1 页码:18-23
中文摘要	三江源区广泛分布着高寒风沙沉积物。野外调查和测验分析了20处风沙沉积物及15处水力侵蚀沉积物的颗粒级配和矿物成分,并整理了21个国内外活动沙丘和63个水力侵蚀和重力侵蚀沉积物的颗粒级配。研究结果表明:风沙沉积物具有均匀的粒径分布和相对固定的粒径大小,完全区别于其他沉积物。活动沙丘演变为固定风沙土的过程中粘土矿物和腐殖质增加:固定风沙土的粘土矿物含量可达到活动沙丘的2倍,而半固定风沙土局于两者之间,固定风沙土的腐殖质含量可达到活动沙丘的3倍左右。粘土矿物和腐殖质的增加导致沙丘表层颗粒细化,固定风沙土的细颗粒含量可达到活动沙丘的2倍左右,分选系数增加近一倍。
英文摘要	The source area of the Yangtze,Yellow and Lancang (Mekong)Rivers is named Sanjiangyuan in China and is situated in the northeastern Tibetan Plateau.Blown sand deposits are widely distributed in Sanjiangyuan.Field investigations and laboratory analyses were used to determine the size distributions and mineral compositions of 20samples of blown sand deposits and 15samples of water erosion deposits from this region.The size distributions of 21 samples of moving sand dunes and 63 samples of water erosion and gravity erosion deposits were also obtained from the literature.The research shows that blown sand deposits in different regions have well-sorted size distributions that are totally different from water erosion and gravity erosion deposits.Moving sand dunes were fixed by vegetation and experience long-term weathering so the clay minerals and humus are increased.The fraction of clay mineral in fixed sand deposits is twice that of moving sand dunes.The humus content in fixed sand deposits is three times that in moving sand dunes.As a result,fixed sand deposits contain twice as many fine particles than moving sand dunes.Thus,sorting coefficient of fixed sand deposits is then twice than that of moving sand dunes.
中文关键词	三江源 ; 沙漠化 ; 风沙沉积物 ; 颗粒组成
英文关键词	Sanjiangyuan desertification blown sand deposits size distributions
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENGINEERING MULTIDISCIPLINARY
WOS研究方向	Engineering
CSCD记录号	CSCD:4815942
来源机构	中国科学院地理科学与资源研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/229932
作者单位	1.清华大学, 水沙科学与水利水电工程国家重点实验室, 北京 100084, 中国; 2.中国科学院地理科学与资源研究所, 北京 100101, 中国
推荐引用方式 GB/T 7714	李艳富,王兆印,余国安,等. 三江源区风沙沉积物的特性[J]. 中国科学院地理科学与资源研究所,2013,53(1):18-23.
APA	李艳富,王兆印,余国安,&王春振.(2013).三江源区风沙沉积物的特性.清华大学学报. 自然科学版,53(1),18-23.
MLA	李艳富,et al."三江源区风沙沉积物的特性".清华大学学报. 自然科学版 53.1(2013):18-23.