Carbon density, storage and spatial distribution under different ‘Grain for Green’ patterns in Huitong, Hunan Province Litterfall production and dynamic for twenty years of a successive replanting Cunninghamia lanceolata plantation at Huitong, Hunan Carbon density of the Chinese fir plantation ecosystem at Huitong, Hu′nan Province The plant calorific values in the Chinese fir (Cunninghamia lanceolata) plantations at different ages Dynamics of understory vegetation biomass in successive rotations of Chinese fir (Cunninghamia lanceolata) plantations Soil Carbon Cycle of Phyllostachy edulis Plantation in Huitong Region, Hunan Province Energy Production Characteristics of Chinese Fir Plantations at Different Growth Stages Nutrient Contents and Enzyme Activities in the Soil of Cunninghamia lanceolata Forests of Successive Rotation and Natural Restoration with Follow after Clear-Cutting Understory Vegetation Biomass in Successive Rotations of Different Aged Cunninghamia lanceolata Forests