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Population Structure and Regeneration of the Main Tree Species in Three Typical Forests in the Three Gorges Reservoir Area Spatial Distribution Pattern of Populus davidiana and Betula platyphylla Populations in a Typical Natural Secondary Forest in Rocky Mountain Area of Northern Hebei Studies on the community biomass and its allocations of five forest types in Dinghushan Nature Reserve Spatial point pattern analysis of Quercus variabilis and Pinus tabulaeformis populations in a mountainous area of Beijing Effects of thinning on growth of Mongolian oak (Quercus mongolica) secondary forests Phylogenetic Structure of a Rare Plant Community in Houhe Nature Reserve over Time and Space South China Institute of Botany; Chinese Academy of Sciences; Guangzhou; China