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Community structure and distribution of riparian Bambusa rigida along lower Gongjiang River, China. A Comparative Study of Photosynthetic Characteristics of Caragana davazamcii Between Plants of Different Ages in Huangfuchuan Basin of Ordos Plateau QUANTIZING ANALYSIS ON DYNAMIC OF AGE-CLASS STRUCTURE OF ARBOR POPULATIONS IN QUERCUS LIAOTUNGENSIS FOREST Size-class and Age-class Structures of Larix chinensis Forests Spatial pattern analysis of individuals in different age-classes of Larix principis-rupprechtii in Luya mountain reserve, Shanxi, China Spatial Pattern Analysis of Individuals in Different Age-classes of Betula platyphylla in Huoshan Mountain of Shanxi Province Spatial Pattern Analysis of Individuals in Different Age-classes of Pinus bungeana in Wulu Mountain Reserve,Shanxi,China Analysis of Spatial Pattern and Spatial Association of Pinus tabulaeformis Populations at Different Developmental Stages STUDY ON NORTH-EAST FOREST RESOURCE SUSTAINABLE MODEL