晋西黄土丘陵区坡面刺槐林地土壤水分研究

 为研究晋西黄土丘陵区刺槐林分土壤水分状况,通过2年的定位观测,标定了该地区刺槐林分土壤水分特征曲线,探讨了刺槐林分土壤水分的空间变化规律及其影响因子。结果表明:刺槐林分利用土壤水分范围较广,其林分可以栽植在峁顶、阳坡及半阳坡等处;12年刺槐林分密度低于2250株/hm²时,林地土壤水分可以在生长季末得到补充,而超过2250株/hm²时,林地土壤水分得不到补充,林分在翌年的部分月份处于水分亏缺状况,限制了林木的生长;月降水量、蒸发量是影响林地土壤水分的主要气象因子,郁闭度、胸径、林分生产量等因子是影响刺槐林分土壤水分的植被因素。

Soil moisture of Robinia pseudoacacia stands in the Loess area in West of Shanxi Province

According to the location observation in two years, the change rule of soil water in Robinia pseudoacacia stands were studied, and influence factors to soil moisture were discussed. It was showed that Robinia pseudoacacia is the most resisting drought tree in Loess area. So Robinia pseudoacacia stands and its mixed stand can be planted on south of hill, top of mountain and eastern of hill. When the density of Robinia pseudoacacia stand is less than 2 250 trees per hectare, soil moisture of stands can be supplemented at the end of growth season. When the density of Robinia pseudoacacia stands are more than 2 250 trees per hectare, soil moisture of stands can not be supplement at the end of growth season, so growth of trees are limited. Furthermore by quantificational analysis of the influence factors of soil water, it was showed that rainfall of month, evaporation, humidity of month, density of stand, and biomass are the major meteorologic and vegetation factors.