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对湘东丘陵地区 16年生密度为 2 2 5 0、2 86 0和 32 2 5株· hm- 2 的马尾松 Pinusmassoniana飞播林分生物量及生产力进行了测定分析 .结果表明 :单株生物量随密度的增加而明显减小 ,密度为 2 2 5 0株· hm- 2 的林分的单株生物量是密度为 32 2 5株·hm- 2的林分的单株生物量的 2 .15倍 ;林分生物量同样随密度的增加而减小 ,密度为 2 2 5 0株·hm- 2的林分的林分生物量比密度为32 2 5株· hm- 2 的林分高出 2 6 .5 7t· hm- 2 ;林分各组分的生物量随密度的增大而减小 ,并出现 W干>W根>W枝 >W皮 >W叶 的规律 ;密度为 2 2 5 0株· hm- 2的林分的年均净生长量是密度为 32 2 5株· hm- 2林分的 1.5 0倍 ;林分结构以密度为 32 2 5株· hm- 2的林分合理
Biomass and productivity of Pinus massoniana Pinus massoniana planted at 16-year-old density in Xiangdong hilly region were determined and analyzed.The results showed that biomass per plant The biomass of the stand with the density of 2250 plants · hm-2 was 2.15% of the biomass of the plant with the density of 3225 plants · hm-2 The stand biomass also decreased with the increase of density. The stand biomass with density of 2250 plants · hm-2 was higher than the stand with density of 3225 plants · hm-2 2 6 .5 7t · hm-2. The biomass of each component decreased with the increasing of density, and the law of W leaf> W root> W branch> W skin> W leaf; the density was 22 The net annual average net growth of the 50 × hm-2 stands was 1.5 times that of the 32 2 5 × hm-2 stands. The stand structure had a density of 32 2 plants per hm-2 Sub-reasonable