干旱区生态环境知识资源中心(Arid): 乌兰布和沙漠流动沙丘下风向降尘粒度特征

Arid

	乌兰布和沙漠流动沙丘下风向降尘粒度特征
其他题名	Grain Size Characteristics of Dustfall in the Ulan Buh Desert
	陈新闯 1; 郭建英 2; 董智 1; 李红丽 1; 李锦荣 2; 王合云 1
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2016
卷号	36 期号:2 页码:295-301
中文摘要	选择乌兰布和沙漠典型流动沙丘进行定点野外观测,分析了沙丘下风向不同距离及不同高度降尘的粒度特征及其来源。结果表明:乌兰布和沙漠降尘空间变化大,降尘以细沙为主,随着距离的增加,细沙物质逐渐减少,粉沙和极细沙含量显著增加。降尘平均粒径2.5~3.1Phi,且随距离、高度的增加而变大。分选系数随着距离、高度的增加而变差;2 m高度偏度近乎对称,若设沙丘高度为H,则只有在距离为8H时正偏,高0.5m处降尘在距沙丘0.5~1H近对称,2~8H皆是正偏;峰度随距离的增加逐渐变窄,且2m高度的变化晚于0.5m高度。乌兰布和沙漠降尘以局地物质为主,远源物质及区域物质比例很低。<70 mum的远源物质及区域物质的降尘与下风向距离呈正相关,主要来源于沙漠边缘的荒地、河湖沉积物、农田草地,而>70 mum的局地物质的降尘与下风向距离呈负相关,主要来源于沙丘下垫面沙粒的气流短距离输送。
英文摘要	The dustfall at different height and distance along leeward direction of the typical shifting sand dunes in the hinterland of the Ulan Buh Desert was studied by means of continuous spot observation and particle size analysis. The results show that the spatial variability of the dustfall is significant in the Ulan Buh Desert.The dustfall is mainly dominated by fine sand.Fine sand is gradually reduced with the increase of the distance along leeward direction of the typical shifting sand dunes.Silt and very fine sand increased rapidly with the increase of the distance along leeward direction of the typical shifting sand dunes.The average grain size of the dustfall is in the range from 2.5 Phi to 3.1 Phi,and it grows with the increase of the distance and the height along leeward direction of the typical shifting sand dunes.The sorting coefficient becomes worse with the increase of distance and height along leeward direction of the typical shifting sand dunes.The skewness coefficients is close to symmetry at 2 m height,and positive at 8 H distance when the height of sand dune is H.But at 0.5 m height,it is symmetrical at 0.5 H-1 H distance and positive skewed at 2 H-8 H distance along leeward direction of the typical shifting sand dunes.Kurtosis changes to narrow gradually with distance increase,and the change at 2 m height is later than at 0.5 m height.It can be assumed that the dustfall of the Ulan Buh Desert is mainly from the local material,and the proportion of material from the far sources and regional material is small.The proportion of material from the far sources and regional material(<70 mum)is positively correlated to leeward distance and mainly from the waste land in desert fringe area,the sediment of rivers and lakes,farmland region. But the proportion of local material(>70 mum)is negatively correlated to downwind distance and mainly from the short distance transport of airflow in underlying surface of dune.
中文关键词	流动沙丘 ; 降尘 ; 粒度 ; 乌兰布和沙漠
英文关键词	shifting sand dune dustfall grain size Ulan Buh Desert
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENVIRONMENTAL SCIENCES
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:5691120
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235391
作者单位	1.山东农业大学林学院泰山森林生态站, 山东省土壤侵蚀与生态修复重点实验室, 泰安, 山东 271018, 中国; 2.水利部牧区水利科学研究所, 呼和浩特, 内蒙古 010020, 中国
推荐引用方式 GB/T 7714	陈新闯,郭建英,董智,等. 乌兰布和沙漠流动沙丘下风向降尘粒度特征[J],2016,36(2):295-301.
APA	陈新闯,郭建英,董智,李红丽,李锦荣,&王合云.(2016).乌兰布和沙漠流动沙丘下风向降尘粒度特征.中国沙漠,36(2),295-301.
MLA	陈新闯,et al."乌兰布和沙漠流动沙丘下风向降尘粒度特征".中国沙漠 36.2(2016):295-301.