杨树是黄土高原的主要树种之一。本文根据阴山东段不同立地条件下25年生的四种杨树解析木生长量资料,与该地区同时期气候因素进行了关联分析,按关联度大小,选取了八个气候因素作为聚类因子,再将关联度归一化,求得各因子的权重,表示各气候因素对树木生长作用的大小。最后根据黄土高原西部68个气象站1951—1980年的气候资料,应用动态聚类分析法,把黄土高原西部地区划分成几个不同类型林业气候区,区划结果与实际考察基本相符合。

Poplar is one of the major tree species in the Loess Plateau. According to the analysis of degree of correlation between increment data of analytic Poplar stem measured under different site conditions and the climatic data in the same period, 8 climatic factors whose degrees of correlation are higher were selected as the cluster factors, and then the weight of each factor was obtained based on the value of degree of correlation. The climatic data were collected from 68 meteorological stations in the western part of the Loess Plateau (1951-1980). After these data were standardised and by using dynamic cluster analysis, western Loess Plateau were divided into different forest climate zones.