干旱阳坡半阳坡微地形土壤水分分布研究

采用固定点动态监测的方法,对黄土丘陵区吴起县合家沟流域阳坡和半阳坡各微地形土壤水分进行了对比研究.结果表明,微地形对土壤含水量具有显著影响,阳坡各微地形土壤水分顺序为:切沟>平缓坡>切沟沟头>陡坡>极陡坡;半阳坡各微地形土壤水分顺序为:平缓坡>浅沟>陡坡>极陡坡.0-20 cm土层土壤水分变异系数最大的是切沟,最小的是切沟沟头.最后指出在植被恢复过程中,应根据不同微地形的土壤水分分布特征,结合"适地适树,适林适草"的植被恢复原则,合理配置乔、灌、草的营建模式.

Soil Water in Micro-terrain on Sunny and Semi-sunny Slopes

Using fixed-point dynamic monitoring methods,soil water in micro-terrain on sunny and semi-sunny slopes in Wuqi County,located in the loess hilly area,is studied.Results show that the micro-terrain has a significant impact on soil moisture content.In terms of soil water on sunny slope,landform units may be ranked in the descendant order of gully,gentle slope,top of gully,steep slope,and extremely steep slope;in terms of soil water on semi-sunny slope,in the descendant order of gentle slope,ephemeral gully,steep slope,and extremely steep slope.The variation coefficient of soil water(0-20cm) in gully is the biggest and the top of gully,the smallest.In the process of vegetation restoration,the allocation of trees,shrubs,and grasses should depend on the characteristics of soil water distribution in micro-terrain based on the principle of "suitable place for tree,forest or grass ".