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过去,一些山区和丘陵地区人口密度小,群众不缺柴烧,山上的树木特别是马尾松长得十分繁茂,茎叶郁闭,影响了通风透光,林间空气湿度过大,对松树生长十分不利;加之马尾松下部枝桠枯黄或死亡仍然留在树上,引起病害蔓延。因此,及时适当修枝,不但能获取薪柴,减少树节,有利于提高木材材质,而且还可改善松树的生态条件,加速松树生长。然而,近年来一些地方严重缺乏薪柴,导致对马尾松的剃桠过度,有的仅留1～2盘枝桠,使树梢高悬,随风摇曳。由于剃桠过度,树叶数量少,光合作用减弱,致使
In the past, some mountainous and hilly areas had a small population density and the people did not need firewood. The trees in the mountains, especially the massoniana trees, grew very luxuriantly with stems and leaves closed, affecting the ventilation and transpiration. The air humidity in the forest was too large, Very unfavorable; coupled with the lower branches of Pinus massoniana withered or dead still remain in the tree, causing disease spread. Therefore, timely and appropriate pruning, not only access to firewood, reduce the tree festival, help to improve the wood material, but also improve the pine ecological conditions and accelerate pine growth. However, in recent years, there has been a serious shortage of firewood in some places, causing the shaving of Pinus massoniana to be excessive, leaving only 1 or 2 plates of branches and branches hanging over the trees and swaying in the wind. Due to excessive shaving, fewer leaves, photosynthesis weakened, resulting