Study on Original Forest Community in Nanyue of Hunan Province Ⅲ.Lithocarpus henryi Forest Predictions of net carbon emissions based on the emissions and forest carbon sinks in Yunnan Province Comparison of Soil Organic Carbon Stock of Betula costata Secondary Forest and Mixed Broadleaved Korean Pine Original Forest in Xiaoxing’an Mountains. Anti-soil erodibility of different land use types in Northwest Guangxi Karst Regions