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.

采集鉴定出青海云杉母树林害虫的天敌昆虫135种,其中寄生性昆虫54种,捕食性昆虫81种。查到天敌昆虫省内新记录65种,查清了主要害虫天敌种类。种实害虫优势种云杉球果小卷蛾的寄生蜂14种,总寄生率10%～60%,主要为曲姬蜂、马尾姬蜂和球果平胸姬小蜂3种。在结实大年结合采种收集球果,于结实小年释放寄生蜂,可提高害虫的天敌寄生率36.5%～38.2%,降低虫果率55.1%.