飞播马尾松林生物产量及生产力研究

Study on the Biomass and Productivity of the Plane Seeding Pinus Massioniana Forests

湘乡市16年生不同密度的马尾松(Pinus massoniana)飞播林林分单株生物量随密度的增加而明显减小,低密度林分是高密度林分的2 42倍,高出18.33kg;当林分密度一定后,林分生物量同样随密度的增加而减小,低密度林分比高密度林分高出21.81t/hm2。林分各组生物量随密度增大而减小,并出现W>W根>W枝>W皮>W叶的规律。年均净生长量低密度林分是高密度林分的1.40倍。

The results showed that in 16 - year- old different stand density Pinus massoniana forests, either the single - tree biomass or the stand biomass was obviously reduced with the increasing of the stand density , and the single - tree biomass of the low stand density had increased by 18.33kg and the stand biomass increased by 21.81t/hm2 morn than those of the high stand density. The biomass of the sterm, branch, leaf, bark, and root was reduced with the increasing of the stand density , and showed the regularity Ws > Wr > Wb > Wba > W1; . The net productivity of the low stand density was 1.40 times as much as that of the high stand density.