青海云杉抚育前后林分生长和蓄积变化数学模型的建立

在对祁连山西营河及哈溪两个试验区不同类型青海云杉林抚育前后林分部分生和茵子和蓄积量变化规律的研究中，以５种单因变量回归曲线对抚育前后两类型青海云杉林的单株胸径定期平均生长量，单株材积定期平均生长量以及林分蓄积量按径阶变化的规律分别进行模拟，以相关系数和离散系数两参数结合进行选优，最选选定一种模拟效果最佳的模型为最后模型。

Mathematical Model on Stand Increment and Volume Variation of Tending Felling of Picea Crassifolia Forest

According to the study of the law of the variation of some accretion factors and the amount of growing stock of different types of Picea Crassifolia of Xiying river and Haxi experimental areas in Qilian Mountains,with 5 types of urtivarible regression analysis of periodical annual increment of diameter breast height and periodical annual volume increment,it shows that the key for the mthemaatical model is to select practical dynamic equation. The optimum model has been established by using data of experimental plot of 3 vear-old trees,The growing and variation volume was established for two types of Plcea Crissifolia forest,The model also provide the theoritical basis for the effect of growing after cutting,distribution of stand volume and reasonal management for Plcea Crissifolia forest.