九龙甸水源区桉树林与云南松土壤特性比较

COMPARISON OF SOIL PROPERTIES FOR EUCALYPTUS FOREST AND PINUS YUNNANENSIS FOREST IN JIULONGDIAN WATER SOURCE AREA

通过参照本土云南松次生林土壤的性质,对外来的不同生长段桉树林土壤进行系统的物理性质分析,揭示桉树种植对土壤结构的改造过程。测定结果分析表明:相对于云南林次生林,不同生长段的桉树林土壤在容重、细颗粒含量上表现出较高值;而自然含水量、饱和含水量、总孔隙度、毛管孔隙度、有机质含量等值却很小。因此,桉树种植改变了本土植被下形成的土壤,导致土壤结构状况变差。

By referring to the properties of local Secondary Pinus Yunnanensis forest soil, with system analysis on soil＇s physical properties of Eucalyptus forest, in the different growth stage, reveal the process of eucalyptus planting result in soil structure transformation. The determination results of analysis show that： relative to Secondary Pinus Yunnanensis forest, the bulk density, content of fine particles in different growth stag of eucalyptus forest soil showed higher values; However, the values of natural moisture content, saturated water content, total porosity, capillary porosity, organic matter content equivalents was small. So, the eucalyptus planting change the soil formed under native vegetation, resulted in deterioration of soil structure.