干旱区生态环境知识资源中心(Arid): 中国沙漠地区降尘特征与影响因素分析

Arid

	中国沙漠地区降尘特征与影响因素分析
其他题名	Dustfall Characteristics and Affect Factors in Chinese Desert Region
	樊恒文; 肖洪浪; 段争虎; 李新荣; 李涛; 李金贵
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2002
卷号	22 期号:6 页码:559-565
中文摘要	1991－1998年期间先后使用积尘器在4个地形剖面上监测了沙坡头地区的降尘过程。降尘沉积速率平均4866 kg·hm~(-2)·a~(-1)，降尘沉积具有明显的时空分异规律，月最大沉积于每年的5月发生在丘间低地，这是因为每年的5月份既是区域冬夏季风场的转换季节，又是人类活动破坏地表的时期，并受地貌沉积模式的影响；较小的月沉积于冬季出现在丘顶部位。降尘的粒径集中在2～2500 mum，极细砂占总量的37.16％，沉物属于砂壤质地。Si、Al、Fe、Ca、K、Na、Mg、Ti等8个元素构成检出元素总量的99.53％。10～250 mum的尘屑中含有30种重矿物，其中易风化矿物占56.75％～74.32％。风尘相关分析发现月降尘量与每月>5 m·s~(-1)风速的次数有良好的相关性。
英文摘要	The dust-fall depositions were monitored with dust trappers on the four topographical transections in the Shapotou area from 1991 to 1998. The deposition velocity averaged 4 866 kg · hm~(-2) yearly. The dust deposition had obvious temporal and spatial patterns. The maximal monthly depositions were observed during May of every year at the dune hollows, because the May of every year was both a conversion season from winter wind to summer wind in the region and a period when human activities destroyed the surface, and topographical pattern influenced the deposition. Smaller depositions appeared on the crests during the winter. The particle size of the deposition dis-tributed between 2 ～250 mum. The very fine sand occupied 37. 16% of the total deposition. The texture of the depo-sition belonged sandy loam. The eight elements, Si, Al, Fe, Ca, K, Na, Mg and Ti made up of 99. 53% of the element total. In the particles within 10 ～250 mum contained 30 heavy minerals, in which weathering minerals oc-cupied 56. 75% ～74. 32% . The relative analysis between wind factors and dust deposition displayed that there was a good relativity between the monthly depositions and the monthly times of >5 m · s~(-1) wind speed.
中文关键词	降尘沉积 ; 时空模式 ; 元素和重矿物 ; 沙漠黄土过渡带
英文关键词	aeolian deposition temporal and spatial pattern element and heavy mineral trans-zone between desert and loess plateau
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:1140694
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/203687
作者单位	中科院寒区旱区环境与工程所, 沙坡头沙漠试验研究站, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	樊恒文,肖洪浪,段争虎,等. 中国沙漠地区降尘特征与影响因素分析[J]. 中国科学院西北生态环境资源研究院,2002,22(6):559-565.
APA	樊恒文,肖洪浪,段争虎,李新荣,李涛,&李金贵.(2002).中国沙漠地区降尘特征与影响因素分析.中国沙漠,22(6),559-565.
MLA	樊恒文,et al."中国沙漠地区降尘特征与影响因素分析".中国沙漠 22.6(2002):559-565.