伊犁州引进杨树品种聚类筛选

【目的】对新疆伊犁州引进的426个杨树品种（无性系）两年生林木生长特性进行调查，筛选出速生品种，为该地区杨树的良种选择和遗传育种提供理论依据。【方法】根据杨树品种两年生林木生长状况，采用K-means聚类方法对树高和胸径进行聚类分析。【结果】聚类结果可将426个杨树品种两年生林木分为三大类：第Ⅰ类为生长快类，树高年均生长量为4.21 m，胸径年均生长量为4.89 cm；第Ⅱ类为生长较快类，树高年均生长量为3.57 m，胸径年均生长量为3.84 cm；第Ⅲ类为生长慢类，树高年均生长量为2.81 m，胸径年均生长量为2.52 cm。筛选出杨树优良品种（无性系）220个，其中树高和胸径生长快型的95个，树高和胸径生长较快型125个，占总数的50%以上。【结论】初步筛选出220个杨树优良品种，这些杨树品种生长快，抗逆性强，适宜在伊犁河流域栽培种植。

Cluster analysis of poplar cultivars introduced to Yili State

Objective]Growth characteristics of 426 two-year-old poplars cultivars(clones),introduced in Yili State,were investigated in order to screen out fast-growing varieties suitable for planting in this area and provide materials for its breeding.Method]Tree height and DBH were analyzed by K-means according to the growth status of two-year-old poplars cultivars(clones).Result]The 426 varieties can be classified into three categories:First category had rapid-growing cultivars with an annual average height of 4.21 m and an annual average DBH of 4.89 cm;the second category had moderate-growing cultivars with an annual average height of 3.57 m and an annual average DBH of 3.84 cm;third category included slow-growing cultivars with an annual average height and DBH of 2.81 m and 2.52 cm,respectively.Conclusion]According to the growth characteristic of poplar and their resistance to stresses,220 good varieties(95 rapid-growing cultivars and 125 moderate-growing cultivars) were found suitable for planting in Yili.