Effects of forest litter layer on regeneration of Populus cathayana natural population in Xiaowutai Mountains in China Community Characteristics of Early Recovery Vegetation on Abandoned Lands of Shifting Cultivation in Bawangling of Hainan Island, South China Regeneration characteristics of woody plant seedlings in typical secondary forests in Qinling Mountains. STUDIES ON THE TYPE CLASSIFICATION OF BACKBONE FOREST STRIP FOR CASUARINA EQUISETIFOLIA AND KEY TECHNIQUES FOR ITS REGENERATION AFFORESTATION Seedling regeneration of the primary semi humid evergreen broadleaved forest and its secondary succession communities in Xishan, Kunming