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一、方法的由来鉴于抚育间伐是调整林分密度,改善林分品质、增大营养空间、改善光照和通风条件、促进落叶层分解、提高地力以加速保留木生长的重要措施。对落叶松人工林的抚育间伐技术,目前已由过去的定性间伐逐步向定量间伐过渡,如利用落叶松人工林密度控制图,对确定抚育间伐强度、间伐量、间隔期等技术指标方面、有了科学的依据。但在落叶松人工林抚育间伐每木挂号时,虽然根据“四砍四留”和把林木分为Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ五级的原则,由于林木
First, the origin of the method Given that tending thinning is an important measure to adjust stand density, improve stand quality, increase nutrition space, improve light and ventilation conditions, promote decollement decomposition, improve soil fertility and accelerate wood growth. For the larch plantation tending thinning technology, the current qualitative thinning from the past to the gradual transition to the quantitative thinning, such as the use of larch plantation density control chart, to determine the tending thinning intensity, thinning, spacing and other technical indicators, there are The scientific basis. However, in the larch plantation tending thinning per wooden registration, although according to the “four cut four stay” and the trees are divided into Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ level five principles, as the trees