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一、前言樟子松(Pinus sylvestris var.mongolica)分布于我国大兴安岭北部和呼伦贝尔草原沙地上,是东北地区速生用材和防风固沙的优良树种之一。由于它具有抗寒、耐旱、耐瘠薄、生长迅速、防风固沙能力强、生态适应性广等优点,所以很早以来就引起林业科技工作者的重视。解放初期,辽宁省章固台地区引进樟子松并用于大面积固沙造林,生长很好。榆林地区治沙研究所1964年引种栽培,也生长不错。1980年以来,神木、府谷、佳县、横山等县亦先后引种,由于时间短,现在得出结论还为时过早。本文根据Fuzzy等价关系聚类分析的方法,对榆林地区引种樟子松进行可行性研究,供引种者参考。
I. Introduction Pinus sylvestris var. Mongolica distributed in the northern part of Daxinganling and Hulun Buir steppe sand, is one of the fine species of fast-growing timber and windbreak and sand fixation in northeast China. Due to its advantages of cold resistance, drought tolerance, infertility, rapid growth, strong windbreak and sand fixation and wide ecological adaptability, it has long attracted the attention of forestry scientists. In the early period of liberation, Pinus sylvestris was introduced into Zhangguantai of Liaoning Province and used for large-area sand fixation and afforestation. Yulin Institute of Desert Control introduced and cultivated in 1964, but also grow well. Since 1980, Shenmu, Fugu, Jiaxian, Hengshan counties have also introduced, because of the short time, it is too early to reach a conclusion. Based on Fuzzy Equivalent Relationship Cluster Analysis, this paper studies the feasibility of introducing Pinus sylvestris var. Mongolica in Yulin area for reference of the introducer.