干旱区生态环境知识资源中心(Arid): 科尔沁沙地土壤水分扩散率比较研究

Arid

	科尔沁沙地土壤水分扩散率比较研究
其他题名	A Comparison of Soil Moisture Diffusivity in Horqin Sand Land
	姚淑霞 1; 赵传成 1; 张铜会 2
来源期刊	土壤通报
ISSN	0564-3945
出版年	2014
卷号	45 期号:3 页码:595-600
中文摘要	利用水平土柱入渗法对科尔沁沙地的草地、固定沙丘和流动沙丘0 ~ 20 cm 土层的土壤水分扩散率(D(theta))与土壤体积含水量(theta)之间的关系进行了测定,并建立了D (theta)和波尔兹曼参数(lambda)与theta的定量关系。结果表明:(1)不同类型沙地0 ~ 20 cm 土壤湿润峰迁移速率以草地的最小,其次为固定沙丘,而流动沙丘的最大,平均值分别为0.38、0.70和1.45 cm min~(-1);而且三类沙地土壤湿润峰迁移速率随入渗距离呈对数形式递减;(2)随着土壤体积含水量theta的增加,波尔兹曼参数A逐渐减小,而且当0达到某一临界值之后,lambda急剧减少;(3)三类沙地D(theta)以草地和固定沙丘的较低,平均值分别为1.44和1.43 cm~2 min~(-1),而流动沙丘的较高,平均值为2.88 cm~2 mir~(-1);土壤水分扩散率与土壤体积含水量的关系符合经验公式D(theta)=aebtheta; (4)对科尔沁沙地土壤水分扩散率影响较大的土壤理化性质主要是有机质含量和粘粉粒含量。
英文摘要	The relationship of soil moisture diffusivity and soil water content of 0-20 cm at different typical sandy lands, such as grassland, fixed sand dune and mobile sand dune, were measured by the method of horizontal soil columns, and the relationships of soil moisture diffusivity and Boltzmann parameter with soil water content were studied. The results showed that (1) The wetting front advancement rate of three typical sandy lands increased in the order: grassland, fixed sand dune and mobile sand dune, and the average value was 0.38、0.70 and 1.45 cm min-1, respectively, and the wetting front advancement rate of three sites decreased with infiltration distance, and was fitted as a logarithmic function. (2) With the increasing of soil water content, Boltzmann parameter decreased gradually, and when soil water content got some threshold, the Boltzmann parameter decreased rapidly. (3) The soil moisture diffusivity of grassland and fixed sand dune were smaller, with average values 1.44 and 1.43 cm~2 min~(-1), respectively, and it was higher for mobile sand dune, with value 2.88 cm~2 min~(-1); In addition, the relationship of soil moisture diffusivity and soil water content for three sites met a rule of exponential curve and conformed to the empirical equation of D(thetatheta)=aebtheta. (4) Soil organic matter content and the clay and silt content (<0.05 mm) were key soil physical and chemical properties affecting soil moisture diffusivity of Horqin Sand Land.
中文关键词	湿润峰 ; 土壤水分扩散率 ; 沙漠化 ; 科尔沁沙地
英文关键词	Wetting front Soil moisture diffusivity Desertification Horqin Sand Land
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:5161440
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/2XILL650/231842
作者单位	1.兰州城市学院, 兰州, 甘肃 730070, 中国; 2.中国科学院寒区旱区环境与工程研究所, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	姚淑霞,赵传成,张铜会. 科尔沁沙地土壤水分扩散率比较研究[J]. 中国科学院西北生态环境资源研究院,2014,45(3):595-600.
APA	姚淑霞,赵传成,&张铜会.(2014).科尔沁沙地土壤水分扩散率比较研究.土壤通报,45(3),595-600.
MLA	姚淑霞,et al."科尔沁沙地土壤水分扩散率比较研究".土壤通报 45.3(2014):595-600.