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晋西北“小老树”改造是一个十分紧迫的问题,如何使大面积的“小老树”尽快成材,在很短时期内为国家提供大量优质木材,是林业生产面临的一个重大课题。现就五寨、右玉等县改造“小老树”经验和提高“小老树”林地生产力措施,略谈我们对此问题的一些看法和认识。一、引进杨树优良品种五寨县张家坪林场在山西省林科所指导下,1974年定植了110个杨树品种(组合、系号。以下同),定植后经十年观察生长量、抗性、物候期,选出了格尔里、合作杨~(07#)、群众杨~(38#)、小×美加~(60年后)、合作杨~(02#)五个品种,与小叶杨树高、胸径、材积差异显著(见表3)。选出的格尔里等五个杨树优良
The transformation of “small old trees” in northwestern Shanxi is a very urgent issue. How to make a large area of “small old trees” as soon as possible and provide a large quantity of high-quality timber to the country in a very short period of time is an important issue facing forestry production. Now on Wuzhai, Youyu and other counties to transform the “little old” experience and improve the “little old” forest productivity measures, a brief talk about our views on this issue and understanding. First, the introduction of good varieties of Poplar Zhangzhiping Wuzhai County Forest Farm in Shanxi Province, under the guidance of Lincoln, 1974 planted 110 poplar varieties (combination, the same below.) After planting ten years to observe the amount of growth, resistance During the period of sexuality and phenophase, Geerli, Yangzhou 07 #, Yangzhou 38 #, Xiaoguixi ~ (after 60 years) and Yang Yang (02 #) were selected. Poplar height, DBH, volume difference was significant (see Table 3). Selected Gerry five excellent poplar