桂东南丘陵地马尾松人工林群落生物量及分布格局

采用样方收获和分级取样测定法，对16a生马尾松人工林生物量的积累及分配进行了研究．结果表明：马尾松人工林各器官生物量模型与测树因子（D^2H）存在极显著相关关系．16a生马尾松人工林分总生物量为110．449t·hm^-2群落生物量分布格局为乔木层〉死地被物〉草本〉灌木；马尾松人工林乔木层生物量主要集中在10—20cm径阶范围，占整个乔木层生物量的83．01％，优势木和被压木对林分生物量的贡献不大，平均木构成了乔木层的主林层．乔木层各器官生物量的分布顺序为干材〉枝条〉根〉干皮〉叶；各器官生物量所占比例随着胸径的增大呈现不同趋势：干材与干皮积累的生物量所占比例逐步减小，而树枝、树叶、树根的相对比例在增加，马尾松的干、枝生物量差别逐渐缩小，生物量结构随着胸径的增大趋于稳定．

Biomass and Distribution Pattern of Pinus massoniana Plantation in Southeast Area of Guanxi

The accumulation and distribution pattern of biomass of 16 years old Pinus massoniana plantation were studied by using sampling plot harvesting method and hierarchical sampling method. The results showed that the biomasses of Pinus massoniana were closely related with the measuring factors （D^2H） in different mixed patterns. The total biomass of 16 years old Pinus massoniana plantation are 110. 449 t· hm^-2 and the distributed sequence of total biomass was as follows ： tree stratum 〉 dead litter 〉 understory herb 〉 shrub. The biomass of tree layer of Pinus massoniana in the 10 - 20 cm diameter range occupied 83.01% of total biomass of the tree layer,which made the main contribution to total biomass. The top-trees and the suppressed-trees hadn＇ t the superiority, but the average trees were the main layers. The distributed sequence of the organic biomass of the tree layer was as follows： that trunk 〉 branch 〉 root 〉 bark 〉 leaf. The each organ biomass of the stand showed the different trends with the increasing diameters：the proportions of bark and stem biomasses deceased but that of branch, leaf and root increased gradually. The difference between stern and branch biomasses lessened and the biomass structure tended to stabilize with the diameter increasing.