干旱区生态环境知识资源中心(Arid): 新疆艾比湖周边柽柳沙堆的粒度特征

Arid

	新疆艾比湖周边柽柳沙堆的粒度特征
其他题名	Grain size characteristics of Tamarix nabkha around the Ebinur Lake of Xinjiang
	李万娟; 李志忠; 武胜利; 孙浩捷; 刘金伟; 凌智勇; 曹相东; 王少朴
来源期刊	干旱区地理
ISSN	1000-6060
出版年	2010
卷号	33 期号:4 页码:525-531
中文摘要	以新疆艾比湖周边的柽柳沙堆为研究对象,对柽柳沙堆表层及丘间地砂物质进行系统采样和粒度分析.结果表明:柽柳沙堆表层沉积以极细砂为主(占34.60%),其次是细砂(占21.90%),极粗砂含量最少(占0.08%);丘间地沉积物粒度组成与沙堆相似,只是各组分含量不同.柽柳沙堆表层砂物质平均粒径为4.08Phi;分选性很好;偏度属于极负偏;平均峰度属于尖窄峰态.柽柳沙堆砂的平均粒径与分选性(r=-0.869)、平均粒径与峰度(r=-0.830)都呈现高度负相关;分选与峰度呈现高度正相关(r=0.889);分选与偏度呈现不显著正相关;平均粒径与偏度、偏度与峰度都无相关性.区域风动力条件是影响柽柳沙堆粒度组成及其空间变异的主要因素之一
英文摘要	Ebinur Lake in Xinjiang has become one of the largest sources of dust storms. Nabkhas commonly distributing in arid and semi-arid areas, are mounds composed of wind-borne sediment that trapped by shrubs. The Tamarix nabkha which widely distributes in Ebinur Lake is mainly distributed on bayou and alluvial fan fringe of north-south piedmont. In this paper, the measured results of sediment grain size samples collected from the surface of Tamarix nabkhas in Ebinur Lake are tested and analyzed. The results show that very fine sands are dominant in Tamarix nabkha surface sediments,it account for 34.60%, followed by the fine sand, accounting for 21.90%, then coarse silt, accounting for 13.21%.The very coarse sand content is the least, that accounts for 0.08%.The sufface sand material’s mean diameter is 4.08Phi, due to the top of shrub being destroyed by human, the slope top particle mean diameter is the most coarse. The mean sorted index is 0.12Phi which belongs to well-sorted and the slope top sort is the poorest, because on slope top wind-sand flow was disturbed by the plant and sand chaotic melange. The coefficient of skewness is-0.43Phi which is very negative skewness. This mean surface sediment of Tamarix nabkha is main fine components;the mean kurtosis value is 1.49Phi which belongs to leptokurtic distribution, consequently wind action process is persistent and sort is well and it shows leptokurtic distribution. The windsand flow moves to slope top, due to gravity action and interception by plant, the crude grain material is first deposited,so that the erosion action on windward slope more intensive than sedimentation action, leading to grain being coarse. Because shrub of nabkha top was .destroyed by human in the study area, therefore the sand material mean diameter is coarse;eddy zone of leeward slope being uplift and extending downwind direction, sand grain was largely deposited on leeward slope and reached a certain extent which can lead to sand falling phenomenon. Through analyzing the grain size parameter of Tamarix nabkha,we can find that the mean diameter and sorting feature is excellent negative correlation(r=-0.869), which shows that the lager the mean diameter, the better the sorting;The mean diameter and kurtosis is also excellent negative correlation (r=-0.830), which shows that the larger the mean diameter, the gentler the kurtosis. The sorting feature and kurtosis shows high positive correlation (r= 0.889), which shows that the better the sorting, the sharp the kurtosis;The sorting feature and skewness don’t show significant positive correlation; the mean diameter and skewness, skewness and kurtosis are show uncorrelated. The regional dynamic wind is one of the main factors which influence the grain size composition and spatial variability of Tamarix nabkha
中文关键词	柽柳沙堆 ; 粒度参数 ; 艾比湖
英文关键词	Ebinur Lake Tamarix nabkha grain size parameter
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:3967094
来源机构	新疆师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/225009
作者单位	新疆师范大学地理科学与旅游学院, 乌鲁木齐, 新疆 830054, 中国
推荐引用方式 GB/T 7714	李万娟,李志忠,武胜利,等. 新疆艾比湖周边柽柳沙堆的粒度特征[J]. 新疆师范大学,2010,33(4):525-531.
APA	李万娟.,李志忠.,武胜利.,孙浩捷.,刘金伟.,...&王少朴.(2010).新疆艾比湖周边柽柳沙堆的粒度特征.干旱区地理,33(4),525-531.
MLA	李万娟,et al."新疆艾比湖周边柽柳沙堆的粒度特征".干旱区地理 33.4(2010):525-531.