桂西北马尾松人工林生物量生长规律及其分配模式

Biomass and Distribution Patterns of Pinus massoniana Plantation in Northwest Guangxi

对桂西北马尾松人工林的单木生物量相对生长模型、林分生物量及其分配规律的研究结果表明:(1)马尾松树干、树皮、地上生物量、地下生物量以及总生物量以方程W=a×(D2H)b的拟合效果为好,树枝和树叶以方程W=a×Db的拟合效果为好。(2)不同林龄马尾松林分标准木各器官的生物量所占总生物量的百分比出现明显的变化。在不同的马尾松林龄中,各器官的生物量均以树干为最高,同时随着林龄的增加,其所占百分比例出现明显的升高,随着林龄的继续增大,其所占百分比逐渐趋于稳定。与树干的变化趋势相反,树皮、树枝、树叶和树根的所占总生物量百分比随着林龄的增加而呈现下降。(3)林分生物量随着林龄的增大而出现明显的增加。林分树干和树枝的总生物量和所占百分比均出现明显的上升;树皮和树叶的总生物量随林龄的增加而增加,但其所占乔木层总生物量的百分比则随着林龄的增加而下降;地下生物量随林龄的增大而无显著变化。

Biomass allometric model and distribution pattern of Pinus massoniana plantation in Northwest Guangxi were studied in this paper by means of the standard-timber harvesting methods.The results showed that：（1） It was better use W = a×（D2H）b as the formulation in stem,bark,aboveground biomass,underground biomass and total biomass,while W = a×Db in branch and leave.（2） It showed obvious variations in the proportions of organ biomass at different age.The proportion of stem biomass was the largest with the biggest biomass,which was also increased along with the age increasing till stable as the age to a level.This was opposite in bark,branch,leave and root.（3） The total biomass and different organ biomass were obviously increased along with the age.The proportion of stem and branch was rising up while the proportion of bark and leave was coming down with the age increasing.There were no significant changes in underground biomass at different ages.