In this study, Picea schrenkiana var. tianshanica forests in five different longitudinal sites (Zhaosu, Gongliu, Wusu, Urumqi and Hami) in Tianshan Mountains were investigated by using vertical transects. The percentage of trees in different sizes, the diameter classes distribution, and the fitted equations for accumulated stem percentage of P. schrenkiana var.tianshanica were analyzed in order to study the population diameter classes structure. The results showed that the decreasing order for percentage of seedling,sapling and the small trees is Hami, Urumqi, Gongliu, Zhaosu and Wusu.The distribution of stem abundance along the diameter classes in Zhaosu, Gongliu, Wusu, Urumqi and Hami all had an inversed "J" shape. The best fitted equation in Zhaosu and Urumqi for accumulated stem percentage of P. schrenkiana var.tianshanica was exponential,while the best one for another three sites was logarithmic.Gongliu preserves the best natural populations of P. schrenkiana var. tianshanica in terms of various size class analysis indexes.

为全面了解杏树林害虫的危害与发生规律, 为综合防治提供依据, 应用生物多样性指数分析了英吉沙县不同管理措施杏园生态系统中昆虫群落结构特征。结果表明: 在3 种类型的杏园中有昆虫37 种, 分别隶属于9 目26科; 不同杏园昆虫群落的科数、物种数及丰富度均有不同程度的变化; 不同生境集中性指数也有一定的差异; 各园的优势种主要以刺吸式口器的朝鲜球坚蚧为主; 不同杏园昆虫群落及各类群生态优势集中性在不同时段并不一致。