林分密度对马尾松飞播林生物产量及生产力的影响

陈兆先　 何友军　 柏方敏　 张际红　 李志辉　

摘　要：对湘东丘陵地区16年生密度为2250、2860和3225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2250株^.hm^-2的林分的单株生物量是密度为3225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2250株^.hm^-2的林分的林分生物量比密度为3225株^.hm^-2的林分高出26.57t^.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2250株^.hm^-2的林分的年均净生长量是密度为3225株^.hm^-2林分的1.50倍；林分结构以密度为3225株^.hm^-2的林分合理.
关键词：马尾松飞播林； 生物量； 生产力； 林分密度
分类号：S718.55⁺6; S791.248.06　文献标识码：A
文章编号：1000-2502(2001)01-0044-04

Effects of Stand Density on the Biomass and Productivity of Pinus masso niana Air-sowing Stands

CHEN Zhao-xian（Forestry Bureau of Hunan Province, Changsha 410007, Hunan, China）　
HE You-jun（Forestry Bureau of Hunan Province, Changsha 410007, Hunan, China）　
BAI Fang-min（Forestry Bureau of Hunan Province, Changsha 410007, Hunan, China）　
ZHANG Ji-hong（Fore stry Bureau of Liling City, Liling 423400, Hunan, China）　
LI Zhi-hui（Central South Forestry University, Zhuzhou 412006, Hunan, China）　

Abstract：The biomass and productivity of 16-year Pinus massoniana air-sowing s tands with the densities of 2250, 2860, and 3225 trees^.hm^-2 were investig ated in the hilly country of East Hunan. The results show that the biomass of single tre e decreases distinctly with the increase of the density，and the single tree bio mass of the stand of 2250 trees^.hm^-2 is 2.15 times as that of the stand of 3225 trees^.hm^-2. Likewise, the biomass of the stand decreases with the i ncrease of the density and the biomass of the stands with low densities is 26.57 t^.hm^-2 higher than that wi th high densities. The biomass of eath component of stand decreases with the in crease of the stand density, and a pattern appears which can be exhibited as W stem> W root > W branch> W bark > W leaf. The annual net biomass of the stand of 2250 trees^.hm^-2 is 1.50 times as that of the stand of 3225 trees^.hm^-2. A reasonable stan d struc ture was observed in the stand of 2250 trees^.hm^-2.
Keywords：Pinus massoniana air-sowing stands; bio mass; productivity; stand density

出版日期：2001年3月1日