干旱区生态环境知识资源中心(Arid): 库姆塔格柽柳沙包年层粒度特征及其沉积环境探讨

Arid

	库姆塔格柽柳沙包年层粒度特征及其沉积环境探讨
其他题名	Exploration to sedimentary environment and grain-size characteristics in age layers of Tamarix sand-hillocks in Kumtag Desert
	张锦春 1; 刘长仲 2; 姚拓 2; 孙涛 3; 郭春秀 3; 袁宏波 3; 唐进年 3; 丁峰 4; 李学敏 3; 宋德伟 5
来源期刊	干旱区地理
ISSN	1000-6060
出版年	2014
卷号	37 期号:6 页码:1155-1162
中文摘要	通过3个典型柽柳沙包年层粒度特征分析,探讨了库姆塔格120a以来柽柳沙包沉积环境的演变过程。结果表明:(1)柽柳沙包粒度组分总体以细沙为主,年层平均含量为67.0%,粗沙和粗粉沙分别为13.0%和12.4%,粒径分布细且分选性差,偏态多正偏,个别极正偏,峰态中等偏窄,属典型风成物沉积;(2)柽柳沙包年层粒度空间分布以东部湿地沙包沉积物细,沙粒含量77.2%,平均粒径为2.99$,西部谷地沙包沉积物颗粒粗,沙粒含量为85.1%,平均粒径为2.92Phi;而沙包年层粒度时间分布则随着沉积层增加呈现粗粒化,20世纪以来,柽柳沙包顶部沙粒含量在61.7% ~ 78.8% 之间,年层沉积物细,分选性差,底部增为85.5% ~ 96.1%,年层沉积物粗,分选性好。柽柳沙包年层粒度时空变化反映了不同生境条件和不同沉积时段的沉积过程及其风沙环境的多样性变化。(3)120 a以来柽柳沙包年层粒度反映了库姆塔格沙漠环境以干旱强风气候模式为主,并伴随着明显的干湿交替变化过程。
英文摘要	The Kumtag Desert,China ’ s sixth largest desert,lies in the south-east of the Lop Nur region,and is famous for the unique dune type of Pseudo-feathery dunes in the whole world. It is expanding and threatening to engulf previously productive lands with its arid wasteland character with the eastward speed of 1-4 m agely. The Tamarix sand-hillocks are one kind of special biological landform types,with legible age layers structure composited by sand and plant litters,in the Kumtag Desert. And their age layers structure was important significance to reveal desert environmental evolution. The paper applied age layers environmental analysis techniques to collect the grain-size sample of three typical Tamarix sand-hillocks in the Kumtag Desert,and the sand-grain characteristics of the age layers were analyzed for discussion the sedimentary environment evolution in the past 120 years. The results suggest as follows : (1) The Tamarix sandhillocks’granularity composition of grain-size is dominated by the fine sand, whose age layer average content is 67.0 % and the content of coarse sand and coarse powder sand came next, with average value of 13.0% and 12.4%. They are every fine grain-size, badly sorted, a positive or very positive skewness, and a medium and narrow kurtosis, they belongs to aeolian sediments. (2) On the spatial distribution of grain-size,the sediments of the wetlands sand-hillocks in the east is every fine with content of sands accounting for 77.2% and average grainsize value of 2.99 Phi,the valley sand-hillocks in the west is every thick with sands content of 85.1% and average grain-size ranges of 2.92 Phi.On the other hand, the more increased the sedimentation age, the coarser the grain-size of age layers of the Tamarix sand-hillocks in the 20th century,the content of sands is minimum of the top sand-hillocks which changes from 61.7% to 78.8% and its bottom’ s one is more whose sand content changes from 84.54% to 97.78%. It reflects the diversity changes of the sedimentation environment in the different habitats and deposition time. (3) The grain-size of age layers of the Tamarix sand-hillocks in the past 120 years reflects that the Kumtag Desert environment is mainly based on the dry-windy climate model and the obviously alternation process of drying and wetting are accompanied with it.
中文关键词	库姆塔格沙漠 ; 柽柳沙包 ; 年层 ; 粒度特征 ; 沉积环境
英文关键词	the Kumtag Desert the Tamarix sand-hillocks age layers grain-size characteristics sedimentary environment
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:5321740
来源机构	甘肃农业大学 ; 甘肃省治沙研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/231141
作者单位	1.甘肃农业大学, 甘肃省荒漠化与风沙灾害防治国家重点实验室培育基地, 兰州, 甘肃 730070, 中国; 2.甘肃农业大学, 草业生态系统教育部重点实验室, 兰州, 甘肃 730070, 中国; 3.甘肃省治沙研究所, 甘肃省荒漠化与风沙灾害防治国家重点实验室培育基地, 兰州, 甘肃 730070, 中国; 4.甘肃民勤荒漠草地生态系统国家野外科学观测研究站, 甘肃民勤荒漠草地生态系统国家野外科学观测研究站, 民勤, 甘肃 733300, 中国; 5.甘肃省治沙研究所, 兰州, 甘肃 730070, 中国
推荐引用方式 GB/T 7714	张锦春,刘长仲,姚拓,等. 库姆塔格柽柳沙包年层粒度特征及其沉积环境探讨[J]. 甘肃农业大学, 甘肃省治沙研究所,2014,37(6):1155-1162.
APA	张锦春.,刘长仲.,姚拓.,孙涛.,郭春秀.,...&宋德伟.(2014).库姆塔格柽柳沙包年层粒度特征及其沉积环境探讨.干旱区地理,37(6),1155-1162.
MLA	张锦春,et al."库姆塔格柽柳沙包年层粒度特征及其沉积环境探讨".干旱区地理 37.6(2014):1155-1162.