不同人为干扰程度对森林土壤水分物理性质的影响

Effects of Different Human Interference on Forest Soil Water-Physical Properties

本研究探讨了不同人为干扰程度下米槠林地的土壤水分物理性质。结果表明,随着人为干扰强度的增加,容重呈现明显的增加的趋势,人促更新林容重大于其他林分,天然林容重最小。天然林转变为天然更新林,非毛管孔隙度增加2.39%,而转变为人促更新林非毛管孔隙度减少了1.01%;毛管孔隙度和总孔隙度的变化趋势一致,天然林转为天然更新林、人促更新林均减少。天然林的毛管持水量、最小持水量、最大持水量均最大。这表明随着人为干扰程度增加,对土壤水分物理性质影响越大。

Soil water-physical properties of Castanopsis carlessi forests under different human interference were examined. The results show that, with the increase of human interference, soil bulk densityincreased obviously. This is reflected in the phenomenon that soil bulk density of artificially regenerated forests was higher than that of other forests and natural forests had lowest soil bulk density. Noncapillary porosity increased by 2.39% in the conversion of natural forests into naturally regenerated forests, but decreased by 1.01% when converted into artificially regenerated forests. Furthermore, forthe two types of conversion, total porosity and capillary porosity both reduced. Capillary holding capacity, minimum water holding capacity and maximum water holding capacity of natural forests＇ soil werelargest. All these results showed that the impacts on soil physical properties would increase with human disturbance degree.