Studies on the Characteristics of Naturally-Regenerated Communities of Two Types of Plantation in Jianfengling, Hainan Dynamics of Litter Fall in Cunninghamia lanceolata Forest Using Wave-type Time Series Analysis DENSITY REGULATION LAW FOR CUNNINGHAMIA LANCEOLATA FOREST DURING SELF-THINNING Biomass Estimation Factors and Their Determinants of Cunninghamia lanceolata Forests in China STUDY ON WATER BALANCE OF THE CUNNINGHAMIA LANCEOLATA FOREST IN THE DIFFERENT ECOLOGICAL GEOGRAPHIC AREAS IN GUANGXI Studies on the Timber Assortment Outturn and Economic Benefit of the Intermediate Cutting Intensity for Cunninghamia lanceolata Stands A Study on Growth and Rational Density Management Model of Cunninghamia lanceolata Forest Study on stand Diameter Structure Model