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松林抚育存在着林分过密到什么程度需要疏伐,应在何时进行首次疏伐,疏伐后单位面积要保留多少株,预期疏伐后木材增长效应如何等问题。本文叙述湿地松和火炬松天然林疏伐问题的一些研究结果。首次疏伐期:湿地松和火炬松一般在5年生以前进行首次疏伐。及时疏伐能保证林分
There is a need for deforestation for the degree of deforestation in the forestation. When should the initial thinning be conducted? How many strains should be conserved per unit area after the thinning? How is the expected effect of the timber growth after the thinning? This article describes some research results of the natural forest thinning of Pinus elliottii and Pinus taeda. First thinning period: Slash pine and loblolly pine generally carry out the first thinning before 5-year-old. Timely sparse to ensure that the stand