岷江上游不同植被类型的土壤水分和物理性质

土壤水分-物理性质是衡量土壤质量的重要指标。本文测定了岷江上游理县云杉人工林、灌木林、经济林和农耕地的土壤物理性质。结果表明:(1)云杉人工林的土壤容重最小,土壤毛管孔隙度、非毛管孔隙度、田间最大持水量、毛管持水量显著高于其余3种植被类型;(2)灌木林与经济林的非毛管孔隙度、毛管持水量、田间最大持水量差异不显著,但灌木林的土壤容重显著小于经济林;(3)农耕地的土壤容重显著高于其余3种植被类型,非毛管孔隙度、毛管持水量、田间最大持水量显著低于其余3种植被类型。研究结果说明4种植被类型的土壤物理性质存在较大差异,选择合理的植被类型和减少人为干扰对于岷江上游地区植被恢复和生态功能改善具有重要的作用。

Soil Water-physical Properties of Different Vegetation Types in the Upstream Areas of the Minjiang River

Soil physical properties are the important indicators for measuring soil quality.The soil water-physical properties were tested in the spruce plantation,shrubs,economic forests and agricultural land in Lixian,located in the upstream areas of the Minjiang River.The results showed that(1) The soil bulk density of the spruce plantation was the lowest,soil capillary porosity,non-capillary porosity,maximum water holding capacity,and capillary water holding capacity were significantly higher than those in other three vegetation types.(2) The non-capillary porosity,capillary water holding capacity and maximum water holding capacity of the shrub forest and economic forest were not significantly different,but the soil bulk density of shrub forest was significantly lower than that of economic forest.(3) The soil bulk density of the agricultural land was significantly higher than that of the other three vegetation types.The non-capillary porosity,capillary water holding capacity,and maximum water holding capacity of the agricultural land were significantly lower than those in other three vegetation types.It could be seen that there were large differences in the soil physical properties of the four vegetation types.It would play an important role to choose a reasonable vegetation type and reduce human disturbance in vegetation restoration and ecological function improvement in the upstream areas of the Minjiang River.