Abstract: Indexes including organic matter content, water stable aggregate content, mean weight diameter of water stable aggregate, aggregate degree and disperse coefficient were selected to evaluate soil anti-erodibility of soil and water conservation forests component of different tree species at different ages. The results showed that soil and water conservation forest played an important role in improving soil anti-erodibility, especially to the topsoil. Compared with that of Chinese pine pure forests, Chinese pine broadleaved mixed forests had higher soil organic matter content, and water stable aggregate content increased by 1.71%～38.53%, and soil anti-erodibility was also increased with increasing stand age.

Key words: Soil and water conservation forest, Soil anti-erodibility, Organic matter content, Water stable aggregate content, salt tolerance, cotton, root morphology, salt stress