青钱柳幼林地上部分生物量生长模型研究

A study on growth and aboveground biomass production of juvenile Cyclocarya paliurus plantations

【目的】青钱柳是我国特有的珍稀多用途树种,研究青钱柳幼树地上部分生物量生长规律,为发展叶用林提供依据。【方法】以6年生的青钱柳人工幼林为研究对象,对其生长特性及生物量的分配进行了研究,同时选取了37株样木进行地上部分生物量及相关测树因子的分析评价,从19个生物量模型中进行筛选,构建了青钱柳人工林各生物量组分及地上部分生物量与相关测树因子的预估方程。【结果】青钱柳幼林地上部分生物量(W)与胸径(D)具有高度相关性,筛选的4个模型均以胸径作为自变量,则:(1)干生物量模型W=0.15 D^(2.1),R^(2)=0.982;(2)枝生物量模型W=0.05 D^(1.88),R^(2)=0.864;(3)叶生物量模型W=0.07 D^(1.55),R^(2)=0.802;(4)地上部分生物量模型W=0.28 D^(1.95),R^(2)=0.976。【结论】不同密度下6年生青钱柳幼林生长尚未郁闭,受密度效应的影响较低,胸径、树高和单株材积的总生长量之间差异不显著,单株和林分生物量分配模式基本相似,地上部分各器官生物量分配由大到小表现为干(73%)>枝(16%)>叶(11%)。

【Objective】Cyclocarya paliurus is a highly valued and multiple-function tree species with high potential for the use of its leaves.The aims of this study is to investigate the aboveground biomass-growth patterns of juvenile C.paliurus.【Method】Six-year-old C.paliurus plantations were established to investigate the growth characteristics and biomass distribution.Thirty-seven trees were selected to analyze the correlation between aboveground biomass and tree growth factors.Based on this,the biomass estimation equation was screened using 19 equations.【Result】There were significant correlations between biomass production and diameter at breast height(DBH),and the following four models were selected as the best equations for biomass estimation:(1)for stem biomass,W=0.15 D^(2.1),R^(2)=0.982;(2)for branch biomass,W=0.05 D^(1.88),R^(2)=0.864;(3)for leaf biomass,W=0.07 D^(1.55),R^(2)=0.802;(4)for aboveground biomass,W=0.28 D^(1.95),R^(2)=0.976.【Conclusion】At different densities,the canopy of the juvenile Cyclocarya paliurus plantations at six years was not closed yet;therefore,DBH,tree height,and volume growth per plant were less affected by the density effect.The biomass distribution patterns of individual trees were similar,and the distribution pattern of aboveground organs was as follows:stem(73%)>branch(16%)>leaf(11%)at the age of six years.