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油松(Pinus tabulaeformis Ca-rr)是我国北方的主要造林树种之一。我省东北部地处其天然分布区的西缘,近年来,营造人工林的规模日益扩大。为弄清油松在高寒干旱山地对立地条件的依赖关系,1982—1983年,我们在西宁市湟水林场进行了系统定位观察.该场海拔2,300—2,450米,属于干旱浅山。年平均气温5.7℃,7月平均气温17.6℃,绝对最高温33.5℃;1月平均气温-12.1℃,绝对最低气温-26℃;≥10℃年平均积温2,151℃(135天)。年平均降
Pinus tabulaeformis Ca-rr is one of the main afforestation species in northern China. The northeast of our province is located in the western margin of its natural distribution area. In recent years, the scale of creating artificial forests has been expanding. In order to understand the dependence of Pinus tabulaeformis on the site conditions of alpine and arid mountain, we systematically observed and observed the condition of Pinus tabulaeformis in the alpine arid mountainous area from 1982 to 1983. The altitude of 2,300-2,450 meters above sea level is arid shallow mountain. The average annual temperature of 5.7 ℃, July average temperature of 17.6 ℃, the absolute maximum temperature of 33.5 ℃; January average temperature of -12.1 ℃, the absolute minimum temperature of -26 ℃; ≥ 10 ℃ average annual temperature of 2,151 ℃ (135 days). The average annual decline