一、抚育采伐的任务(一)提高林分质量:间伐可将不良木、老枯木伐除,给优良植株创造更有利的地上和地下营养空间。(二)减少无益竞争,加速林木形成:林木郁闭之后,随年龄的增加,单位面积上的株数下降(自然稀疏),弱亡强存,保留者也因竞争而影响生长。因此,在其自然竞争剧烈时期,加以人为干预,伐除部分林木,等于加速自然竞争过程,有利于保留木的 First, the task of felling and cutting (A) to improve the quality of the stand: Thinning can bad wood, old deadwood removed, to create better plants more favorable aboveground and underground nutrition space. (II) Reduce unhelpful competition and accelerate the formation of forest trees: After the forest is closed, with the increase of age, the number of trees per unit area will decrease (natural sparseness), and the survivors will also be affected by competition. Therefore, in the period when the natural competition is fierce, human intervention and the removal of some trees are equal to speeding up the process of natural competition and favoring preservation of wood