干旱区生态环境知识资源中心(Arid): 毛乌素沙地沙丘干沙层水分特征初步研究

Arid

	毛乌素沙地沙丘干沙层水分特征初步研究
其他题名	Preliminary Study on Soil Moisture Content in Dried Layer of Sand Dunes in the Mu Us Sandland
	王志; 王蕾; 刘连友; 郑秋红
ISSN	1001-4675
出版年	2006
卷号	23 期号:1 页码:89-92
中文摘要	干沙层对抑制蒸发保护沙漠地区的生态水具有重要作用.在毛乌素沙地进行水分实验观测表明,当地干沙层的厚度在12～20 cm,干沙层内部的平均含水量在0.42%～0.54%,且水分由地表向下边界呈指数增加,R2在0.88～0.99之间.干沙层的厚度变化与所处沙丘的位置、沙面活动程度以及有无植被覆盖等有关.降雨对近地表干沙层的消失和产生有重要影响,近地表干沙层的发育是水分下渗、蒸发和水汽凝结共同作用的结果.
英文摘要	The study area （37°38＇42＂-37°42＇42＂N, 108°50＇54＂- 108°58＇00＂E） is located in the southern marginal zone of the Mu Us Sandland in the northern part of Jingbian County, Shaanxi Province. In the area it belongs to the semiarid climate, the annual precipitation is 395.4 mm, the rainfall occurs mainly during the period from July to September and its proportion occupies 80 % of the annual precipitation, and the annual evaporation is as high as 2 361.6 mm; the annual temperature is 7.8 ℃, and the diurnal-nocturnal temperature difference is high; the annual sunshine duration is 2 768.8 hours, strong winds occur frequently, especially in winter and spring, the annual days of occurring strong winds are 19.2 days, the annual average and maximum wind speeds are 3.2 m/s 24.0 m/s respectively, and the direction of prevailing wind is NW. In the study area soil is dominated by aeolian sandy soil, the soil fertility is poor, the natural vegetation is sparse, and the areas of mobile-dune regions and semi-fixed sandlands occupy 31.6% and 36.5% respectively. Dried sand layer plays an important role in restricting evaporation and conserving ecological water in deserts. The experiment in the Mu Us Sandland reveals that the thickness of dried sand layer varies in a range of 12-20 cm, the soil moisture content in the dries sand layer varies in a range of 0.42 % -0.54 % and is increased downward in an exponential way, and R2 varies in a range of 0.88-0.99. The thickness of dried sand layer is related to the dune location, mobile degree of sand surface, vegetation types and coverage, etc. Rainfall affects significantly the soil moisture content, the dried sand layer disappears and the peak values of soil moisture content occur in succession and reduce downward after rainfall. Evaporation brings about a reoccurrence of the dried sand layer.
中文关键词	干沙层 ; 水分 ; 降雨 ; 下渗 ; 蒸发 ; 凝结 ; 毛乌素沙地
英文关键词	dried sand layer soil moisture content rainfall downward infiltration evaporation condensation the Mu Su Sandland.
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:2296700
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/219725
作者单位	北京师范大学资源学院中国沙漠研究中心, 环境演变与自然灾害教育部重点实验室, 北京 100875, 中国
推荐引用方式 GB/T 7714	王志,王蕾,刘连友,等. 毛乌素沙地沙丘干沙层水分特征初步研究[J]. 北京师范大学,2006,23(1):89-92.
APA	王志,王蕾,刘连友,&郑秋红.(2006).毛乌素沙地沙丘干沙层水分特征初步研究.,23(1),89-92.
MLA	王志,et al."毛乌素沙地沙丘干沙层水分特征初步研究".23.1(2006):89-92.