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杨树是山西省的主要造林树种之一,造林面积大、分布广、品种多。但在晋西北地区由于自然条件恶劣等原因,林木生长不良,蓄积量很低。仅国营杨树丰产林实验局118万多亩人工林,大部分成为“小老树”。因此,如何防止形成“小老树”,建立速生丰产林,一直是人们关注的问题。选择优良杨树品种及其适宜区的研究是解决上述问题的重要途径。本文采用聚类分析的方法,对五寨县张家坪林场的110个杨树品种及无性系
Poplar is one of the main afforestation species in Shanxi Province. Afforestation area is large, widely distributed and many varieties. However, due to poor natural conditions in northwestern Shanxi, tree growth was poor and the stock volume was low. Only the state-owned Yangshufeng Forest Experimental Bureau of 1.18 million mu of plantations, most of them become “little old tree.” Therefore, how to prevent the formation of “small old trees” and establish fast-growing and high-yield forests has always been a concern for people. The selection of good poplar varieties and their suitable area is an important way to solve the above problems. In this paper, cluster analysis method was used to analyze 110 poplar varieties and clones of Zhangjiaping Forest Farm in Wuzhai County.