乌兰布和沙漠东北部土壤水分变化特征的研究

通过对乌兰布和沙漠东北部土壤水分变化的特征研究表明:流动沙地土壤水分在空间变化上可分为三个层次:表层干沙层、沙地水分变化剧烈层、沙地水分稳定层;半固定沙地黄沙层和灰白色沙层物化性质几乎相似,只是含水量不同引起颜色不同;固定沙地按含水量变化趋势从地表向下分成四个区域:(1)从地表至粘土层结束;(2)不受地下水和降雨蒸发强烈影响的非稳定下渗层;(3)非饱和毛管上升高度层;(4)饱和毛管上升高度层;丘间低地土壤水分在空间上分为:(1)水分变化频繁活动层;(2)水分潜在供应层;(3)水分相对稳定层。

RESEARCH ON LAND SOIL WATER CHANGING PATTERNS ON THE NORTH OF WULANBUHE DESERT

The study of land soil water changing patterns on the north of Wulanbuhe Desert showed that there are three levels of space changes in moving sands soil water: dry sand layer of surface ,moisture acute changing layer, and stable moisture layer. The physical properties of semi-fixed sand, yellow sandy layer and grey-white layer are similar almost, only color is different due to the water content. There are four districts of immobile sandy land according to the changing trend of water content from the surface land to down:1.from surface land to clay soil;2.instable leak layer which is not influenced by underground water and rainfall evaporation;3.the raising higher layer of un saturated capillary;4.the raising higher layer of saturated capillary. The soil water in lowland sand dune in space was divided into: the frequent changing layer, the potential supplying layer and the relative stable layer.