无量山自然保护区北段2种森林类型的土壤特性

对设于无量山自然保护区北段(南涧段)中山湿性常绿阔叶林和半湿润常绿阔叶林的6块样地的土壤进行了调查研究。结果表明：2种森林类型主要有黄壤和黄棕壤2种土壤；6块样地的土壤没有较明显的差异；土壤的有机质等养分含量丰富，而盐基饱和度稍低。中山湿性常绿阔叶林样地的土壤养分含量、阳离子交换量稍低于半湿性常绿阔叶林的土壤。样地的土壤总孔隙度大于50％，通透性尚好；样地土壤的交换性能较好。

Soil Characteristics of Two Types of Forests at North Part of Wuliang Mountains Nature Reserve

Soil survey was conducted on six samples in mid-montane moist evergreen broad-leaved forest and semi-moist evergreen broad-leaved forest at north part (Nanjian part) of Wuliangshan Nature Reserve. It is found that there are two main soil types in these two forest types, yellow soil and yellow-brown soil. There is no distinct difference between the soil type of all the six samples. The soil has high content of nutrient factors such as organic matter, while the value of base saturation is somewhat low. The nutrient content and cation exchange capacity of the soil in mid-montane moist evergreen broad-leaved forest are lower than that of semi-moist evergreen broad-leaved forest. The total porosity of the soil in samples is higher than 50 %, the soil permeability is acceptable, and the ion exchange ability is good.