干旱区生态环境知识资源中心(Arid): 冻融过程对景电灌区草窝滩盆地土壤水盐动态的影响

Arid

	冻融过程对景电灌区草窝滩盆地土壤水盐动态的影响
其他题名	the influence of freezing and thawing on the moisture-sait activity of soil in caswotan basin of jingdian irrigated area
	张立新 1; 韩文玉 2; 顾同欣 3
来源期刊	冰川冻土
ISSN	1000-0240
出版年	2003
卷号	25 期号:3 页码:297-302
中文摘要	景电灌区为干寒气候，蒸发强烈，季节冻土发育，土壤地下水位以上非饱和带毛细作用发育，在地表蒸发作用下，通过毛细作用，地下水不断地向地表运动，导致大量盐分到达地表。虽然蒸发作用下的毛细水运动在土壤水分垂直运动中占绝对优势，但自上而下的季节冻结和融化过程对土壤中水盐重分布的影响也起着重要的作用。基于冻融作用对水盐迁移驱动力和土壤结构等参数的影响，分析了冻融作用下水盐重分布的综合特征。
英文摘要	There are two ways for water to transfer in soil, one is flowing of liquid water and another is moving of vaporous water through pore spaces. Under arid and cold weather, evaporation is strong and frozen soil develops seasonally in the Jingdian irrigated area in Gansu Province along the Yellow River. The irrigation began in 1972 and since then the water equilibrium in this area has been broken. The groundwater table goes up and the salt content increases. In such circumstance, capillary action strongly develops in the unsaturated part of soil a-bove the groundwater table. The groundwater moves up to the top soil through the capillary force resulted from the continuous evaporation from soil surface. In this process, salt also moves up to the soil surface contemporarily with moisture transfer. Even though the main part of the vertical water movement to topsoil is caused by the capillary action, another periodical action, freezing and thawing, has also an obvious effect on the movement and redistribution of moisture and salt along the soil profile. The effect has two directions. One is a powerful driving force to make water transfer up from the underlying unfrozen layer to the top fro?zen layer, because the freezing process makes the soil relatively dry off due to ice formation; Anoth?er is a strong impedance to stop the moving way of the water, because the ice formation changes the structure of the soil, in particularly, changes the size of the pores in the soil. These two acting directions decide a complex process of water and salt redistribution in soil in the arid and cold area. This paper analyses this process based on the influence of freezing and thawing on the parameters of water driving force and soil structure.
中文关键词	景电灌区 ; 冻融过程 ; 水盐动态
英文关键词	Jindian irrigated area freezing and thawing moisture and salt activity
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MINERALOGY
WOS研究方向	Mineralogy
CSCD记录号	CSCD:1304189
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/2XILL650/203818
作者单位	1.北京师范大学遥感与GIS中心，资源与环境科学系, 北京 100875, 中国; 2.甘肃省景泰县水利局, 景泰, 甘肃 730410, 中国; 3.中国科学院寒区环境与工程研究所, 冻土工程国家重点实验室, 景泰, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	张立新,韩文玉,顾同欣. 冻融过程对景电灌区草窝滩盆地土壤水盐动态的影响[J]. 北京师范大学,2003,25(3):297-302.
APA	张立新,韩文玉,&顾同欣.(2003).冻融过程对景电灌区草窝滩盆地土壤水盐动态的影响.冰川冻土,25(3),297-302.
MLA	张立新,et al."冻融过程对景电灌区草窝滩盆地土壤水盐动态的影响".冰川冻土 25.3(2003):297-302.