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在我国的天然林中,油松(Pinue tabulaeqozmiz)是分布很广的树种之一。它以黄河流域为中心,广泛分布于辽宁、河北、山西、陕西、河南、山东、内蒙古、宁夏、甘肃、青海、四川等十一个省区,东西跨越23个经度,南北相距12个纬度。显然,在如此广泛的分布区,油松生长的差异是很大的。这种生长差异,既反应了遗传变异,也反应了环境变异。本文只涉及环境变异的生长效应。
Pinus tabulaeqozmiz is one of the most widely distributed species in our country’s natural forests. It is mainly distributed in the Yellow River Basin and widely distributed in eleven provinces and autonomous regions in Liaoning, Hebei, Shanxi, Shaanxi, Henan, Shandong, Inner Mongolia, Ningxia, Gansu, Qinghai and Sichuan. Its east-west spanning 23 longitudes and its latitude 12 latitudes north-south. Obviously, in such a wide distribution, the differences in the growth of Pinus tabulaeformis is very large. This difference in growth reflects both genetic variation and environmental variation. This article deals only with the growth effects of environmental variation.