层状土壤毛管水最大上升高度分析  

Maximum height of upward capillary water movement in layered soil

作　　者：史文娟[1] 沈冰[1] 汪志荣[1] 王文焰[1] 

机构地区：[1]西安理工大学水资源与环境陕西省重点实验室,陕西西安710048

出　　处：《干旱地区农业研究》2007年第1期94-97,共4页Agricultural Research in the Arid Areas

基　　金：国家自然科学基金(59879022;40271022);陕西省教育厅基金(04JK229-1);西安理工大学高学历人员科研启动基金

摘　　要：针对目前层状土体剖面夹层土质对毛管水分最大上升高度的影响存在较大分歧,以沙土夹层为例,从土壤水动力学的角度,通过实验和理论分析,分不同情况对层状土壤的毛管水最大上升高度进行了系统研究。结果表明:层状土壤毛管水的最大上升高度取决于夹层土壤的质地、厚度、层位及其相互关系,同时也与土壤剖面中其它土壤的质地密切相关。当其它条件一定时,夹层土壤质地越粗、厚度越大或层位越高,毛管水最大上升高度受影响可能性越大;以沙土的有效粒径和不均匀系数为量化指标,提出了沙质夹层影响毛管水最大上升高度的条件。此结果对于研究层状土壤地区水盐运动以及土壤盐碱化治理有重要意义。According to the fact that the viewpoints on whether the interlayer soil influences the maximum height of the capillary water rise or not always keep difference, the maximum height of the capillary water rise in sand - layered soil was studied through the experiment and analysis which was based on the dynamics theory of the soil water movement. The results showed that the maximum height of the capillary water rise of layered soil was mainly determined by the sand soil texture, position, thickness and their mutual relationship,and they also were closer connected with other soil texture in the profile. When the soil profile was certain, the height was possible influenced by the worse sand particle size distribution, the thicker sand layer or the higher sand layer position as compared to the uniform soil. With D 10 means effective particle diameter of the sand layer and ＂μ＂ means no uniform coefficient of it and ＂z＂ means the position of it, the paper concluded that the height would decrease when the sand layer meets with the conditions, i.e.. This will provide important information for further studies on transport of water and salt in layered soil regions.

关 键 词：层状土壤 夹层土质 毛管水最大上升高度 

分 类 号：S152.7[农业科学—土壤学]