干旱区生态环境知识资源中心(Arid): 塔克拉玛干沙漠腹地垄间沙粒胶结体的基本特性及研究价值

Arid

	塔克拉玛干沙漠腹地垄间沙粒胶结体的基本特性及研究价值
其他题名	The Characteristics and Significances of the Sand Cemented Bodies Discovered on Inter-dune Corridor in Central Taklimakan Desert
	李生宇; 孙娜; 马学喜; 徐新文
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2016
卷号	36 期号:2 页码:265-273
中文摘要	在塔克拉玛干沙漠腹地的部分垄间平沙地中,天然分布有一种特殊物质沙粒胶结体,其与地表的粗沙和极粗沙呈复区分布,共同构成了覆盖沙面的大颗粒层。实地调查和取样分析表明:沙粒胶结体直径不一,能达到粗沙级、极粗沙级和砾石级(细粒和中砾),最大可达23.5 mm;颗粒形状不规则,质地较硬,手捏不碎;密度为2.51 g·cm~(-3),略小于砾石和当地沙丘沙;可溶物的pH值呈中性,电导率2.56 mS·cm~(-1),主要成分为CaSO_4。砾石尺度的沙粒胶结体在地表的分布密度可达807粒·m~(-2),覆盖度2%~3%,由于其尺度和密度与砾石接近,它也应具有与砾石类似的风沙效应。沙粒胶结体也是一种天然固沙材料,研究其形成机制有助于开发新型固沙技术和固沙产品;沙粒胶结体可以抑制沙面风蚀、调节风沙流输沙强度、影响沙丘形态演变,探讨其风沙效应有助于深入认识塔克拉玛干沙漠垄间地的沙面稳定机制。沙粒胶结体的形成应与特殊的地质历史环境背景有关,可以作为沙漠地区历史时期气候变化的一个证据。因此,沙粒胶结体在防沙治沙技术开发、沙漠地区特殊下垫面风沙运动过程、沙漠环境形成演变等方面具有重要的研究价值,值得今后进行深入研究。
英文摘要	There are some sand cemented bodies naturally distributed on some inter-dune corridor in central Taklimakan Desert They form a special large granular layer covering the sand surface together with coarse sand and very coarse sand.Field investigation and sampling analysis indicate that the grain diameter of sand cemented body is uniform,the size can reach the level of coarse sand,very coarse sand and gravel.The diameter of larger ones is more than10 mm,and the diameter of maximal one is up to 23.5 mm.The shapes of sand cemented bodies are very diverse and irregular.It is very hard and can’t been crumbled and even not scattered with water soak.Its specific gravity is about 2.51 g·cm~(-3),less than gravel and local dune sand.The salt content of sand cemented body is so high that its electrical conductivity can reach 2.56 ms·cm~(-1) just like heavy saline soil.Its ingredients in its water extract of crushed material are dominated by calcium sulphate.It is in neutral conditions with pH value of 7.40.The gravel-size sand cemented body lies on the sand surface with a density of807 particles per a square meter and its coverage can reach 2 to 3 percent.Due to its main features similar to gravel,we can supposed that sand cemented body has an effect on aeolian process like gravel.The sand cemented bodies are a natural sand-fixation material.To study the formation mechanism will help to develop new types of sand-fixation technology and sand-fixation products.It should play an important role in some key aeolian processes such as wind erosion control,sand transport regulation,dune morphology revolution on inter-dune corridors in the Taklimakan Desert.So the research on the effect of sand cemented bodies on windblown sand movement is of great academic significance to understand the relative stability mechanism of sand surface on some inter-dune corridor in the Taklimakan Desert.The formation of sand cemented bodies must concerned with a special geological history background,so they can be used as an evidence reflecting the historical of climate changes in the Taklimakan Desert.So the sand cemented bodies deserve further research for its value in basic theory research and practical application.
中文关键词	沙粒胶结体 ; 粒度 ; 化学组成 ; 固沙作用 ; 沙面稳定 ; 气候变化
英文关键词	sand cemented bodies grain size chemical composition sand fixation sand surface relative stability climate change
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:5691116
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235390
作者单位	中国科学院新疆生态与地理研究所, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	李生宇,孙娜,马学喜,等. 塔克拉玛干沙漠腹地垄间沙粒胶结体的基本特性及研究价值[J]. 中国科学院新疆生态与地理研究所,2016,36(2):265-273.
APA	李生宇,孙娜,马学喜,&徐新文.(2016).塔克拉玛干沙漠腹地垄间沙粒胶结体的基本特性及研究价值.中国沙漠,36(2),265-273.
MLA	李生宇,et al."塔克拉玛干沙漠腹地垄间沙粒胶结体的基本特性及研究价值".中国沙漠 36.2(2016):265-273.