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由于长期的异花授粉和自然选择等因素的影响,油松在形态特征、生物学和生理学特性等方面发生了多种多样的变异,形成了一些自然类型,为油松良种选育提供了丰富的资源。关于油松自然变异与形态类型划分的研究,国内曾有过一些报道,但都不够系统。近几年来,我们在陇县八渡林场的16年生油松人工林内,开展了油松自然变异及形态类型划分的研究,取得了一些进展,现介绍如下。一、自然条件和林分状况开展选择的林分位于陇县八波林场北沟工区,属关山支脉的尖山山脉。地理位置北纬34°33′、东经106°21′,海拔高1082～1607
Because of the long-term effects of cross-pollination and natural selection, Pinus tabulaeformis varied in morphological, biological and physiological characteristics and formed some natural types, which provided richness for the breeding of Pinus tabulaeformis Resources. There are some reports about the natural variation and morphological classification of Pinus tabulaeformis, but they are not systematic enough. In recent years, we have carried out the research on the natural variation and morphological classification of Pinus tabulaeformis in the 16-year-old Pinus tabulaeformis plantation in Longsheng Badong Forest Farm. Some progress has been made. First, the natural conditions and the status of the forest to carry out the selection of the site is located in Long Bei Bobo Farm Beigou work area, is the Jinshan branch of the Jianshan Mountains. Its geographical location is 34 ° 33’N, 106 ° 21’E and its elevation is 1082-1607