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华北落叶松(Larix Principis—rupprechtii Mayr),油松(Pinus tabulaefo-rmis Carr),华山松(Pinus armandii Franch)是山地造林的主要树种。材质好,用途广、生长快,有水源涵养、水土保持和保护环境的显著效能。我县玉泉林场于1962年开始,进行了大面积的油松、华山松造林。七十年代初又进行了华北落叶松的引种工作,现均已郁闭成林。为了探索其适生环境和生长发育特点,我们于1983年秋季对该林场草关营林区人工幼林进行了选木解析,现就有关情况,分述如下:
Larix Principis-rupprechtii Mayr, Pinus tabulaefo-rmis Carr and Pinus armandii Franch are the main tree species in mountainous afforestation. Material is good, wide use, fast growth, water conservation, soil and water conservation and environmental protection significant performance. Yuquan Forest Farm in our county began in 1962, conducted a large area of pine, Huashan pine afforestation. In the early 1970s, the introduction of Larix principis-rupprechtii was also carried out. In order to explore the characteristics of its habitat and growth and development, we conducted a wood selection analysis of the artificial young forest in Caoshun forest in this farm in the autumn of 1983, and the relevant situations are as follows: