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为了解不同林分密度下各组分生物量分配模式的变化特征,以20年生油松(Pinus tabuliformis)人工林为研究对象,采用嵌套式回归法建立了油松各器官生物量与胸径、树高的回归方程,并分析了林分地上和地下各器官生物量比例随林分密度的变化趋势。结果表明:油松林生物量分配格局因林分密度(267~3 367株/hm2)的不同存在较大的差异。地上、地下生物量范围分别介于20.74~141.25 t/hm2和5.36~36.92 t/hm2之间。生物量根冠比随林分密度的增加而增加(0.223~0.313,平均0276),其中树干和枝条占总生物量的比例随林分密度的增加而减小,而叶片、粗根和细根的比例随林分密度的增加而增大。研究结果在一定程度上检验了最优分配理论的适用性,同时油松根系生物量模型以及估算方法对准确估算森林生态系统生物量及碳循环具有借鉴价值。
In order to understand the changing characteristics of biomass distribution patterns of different components in different stand density, Pinus tabuliformis plantation was used as research object. The biomass and DBH of all organs of Pinus tabulaeformis were established by nested regression method. Tree height regression equation, and analyzed the biomass of forest organs above and below the organism biomass with the trend of changes in stand density. The results showed that the biomass distribution pattern of Pinus tabulaeformis forest differs greatly due to the difference of stand density (267 ~ 3667 plants / hm2). The above and belowground biomass ranged from 20.74 to 141.25 t / hm2 and from 5.36 to 36.92 t / hm2, respectively. The root / shoot ratio of biomass increased with the increase of stand density (0.223-0.313, average 0276). The proportion of trunk and shoots to total biomass decreased with the increase of stand density, while the ratio of leaf, The proportion increased with the increase of stand density. The result of the research verifies the applicability of the optimal distribution theory to some extent. At the same time, the root biomass model of Pinus tabulaeformis and its estimation method have reference value for accurately estimating the biomass and carbon cycle of forest ecosystem.