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在我局所辖林区有大面积的黑松(Pinusthunbergii)天然林和人工林。人工林营造于五十年代初期。六十年代开始对10年生以上林木进行人工修枝作业,在缺柴地区修枝的频度和强度很大。我们通过长期观察发现,几乎所有进行过修枝的林木都发生了不同程度的主干弯曲现象,对此,我们称之为“黑松修枝致弯现象”。与落叶松、樟子松、青杨等其他树种的人工林修枝结果相比可以看出,修枝致弯仅是黑松特有的一种现象。由于干形对用材林的使用价值至关重要,我们对黑松致弯现象进行了观察研究。
There are a large area of natural Pinus pinasterii and plantation forests in the forest under our jurisdiction. Plantation was built in the early 1950s. In the 1960s, artificial pruning of trees above 10 years old began to be carried out. The frequency and strength of pruning in the area lacking firewood were very high. Through long-term observation, we found that almost all of the trees that have been pruned have some degree of trunk bending phenomenon, which we call “black pine pruning and bending phenomenon.” Compared with the results of pruning of plantations of larch, Pinus sylvestris, Populus euphratica and other tree species, it can be seen that pruning and bending is only a peculiar phenomenon of Pinus thunbergii. Due to the importance of the use of dry wood to the timber forest, we have observed and studied the phenomenon of bending of black pine.