The features of soil aggregation and its eco—environmental effects under different subalpine forests on the east slope of Gongga Mountain,China

摘要

Structural properties of forest soils have important hydro-ecological function and can influence the soil water-physical characters and soil erosion.The experimental soil samples were obtained in surface horizon (0-10cm) from different subalpine forest types on east slope of Gongga Mountain in the upriver area of Yangtze River China in May 2002.The soil bulk density,porosity,stable infiltration rate,aggregate distribution and particle-size distribution were analyzed by the routine methods in room,and the features and effects on eco-environment of soil aggregation were studied.The results showed that the structure of soil under mixed mature forest is in the best condition and can clearly enhance the eco-environmental function of soil,and the soil structure under the clear-cutting forest is the worst,the others are ranked between them.The study results can offer a basic guidance for the eco-environmental construction in the upper reaches of Yangtze River.