【摘要】 根据间伐 8年后的湿地松林分生长和主伐造材调查结果 ,建立了胸径和断面积等与林分保留密度及本底断面积的回归关系 ,分析比较了不同间伐强度对林木径阶分布和造材材种结构的影响效果。研究结果表明 ,间伐后林分保留密度对林木胸径和断面积生长以及材种结构等均产生显著影响 ;尾径 2 0cm及以上规格的材种出材率随间伐强度增大而增大 ,而1 4cm及以下规格的材种出材率则随间伐强度的增大而减小。不间伐对照总的出材量虽比间伐的大 ,但增加的部分主要为较小规格的材种更多还原

【Abstract】 Slash pine plantation was thinned in 3 different intensity in the experiment, and the investigation of stand growth and bucking was done after 8 years. Based on the measure data, the paper built 3 regression equation between DBH ., basal area and reserve density. It showed that reserve density made significant effect to DBH . and basal area growth. The results also showed that thinning intensity distinctly effect tree diameter class distribution, log assortment outturn and the percentage of log assortment. With the increasing of thinning density, the percentage of outturn which top diameter was 20 cm or more increased, and the percentage of outturn which top diameter was 14 cm or less decreased. The total outturn of ck was more than that of thinned stand, but the increased part were small diameter assortment.\;更多还原