黄土高原人工刺槐林土壤水分特征

Soil water of artifical Robinia pseudoacacia L. on Loess Plateau

在干旱、半干旱的黄土高原地区,水分是制约植被恢复与重建的关键性因子,在天然降水量一定的条件下,植物种群密度通过影响土壤水分含量制约着林木的正常的生长。本文通过研究不同立地类型人工刺槐林的土壤水分状况,得出立地类型对土壤含水量有显著影响;4种立地类型在同一时期土壤水分垂直变化规律基本一致,自上而下呈减少趋势;不同立地土壤水分均值大小依次为阳坡<半阳坡<半阴坡<阴坡;就平均值来看,春旱时期各立地类型土壤水分均可供应充足。

Water is a key factor to restrict vegetation rehabilitation and reestablish in arid and semi - arid on Loess plateau. In the condition of limited precipitation, Vegetation community density very strongly affects its normal growth by adjusting soil moisture. Through studying the site factors of Robinia pseudoacacia L. forests under different site types, we can draw the following conclusions： site types have prominent effects on soil water content; soil water vertical variation tendency of four site types is basically identical at the same time period, show a tendency to reduce from top to bottom ; the size of differ site soil water moisture mean is as the following ： sunny slope 〈 half - sunny slope 〈 half - shaded slope 〈 shaded slope ; the supply of soil water of each site types at spring drought period is enough from the average.