摘要
用欧美杨密度试验林中所选择的标准木和侧枝作材料，以侧枝和树干的长度及直径为观测指标，分别采用不同的数学模型和估侧方法拟合侧枝的叶片、枝条和枝叶总生物量及树干生物量回归估侧模型，并对不同的估测方法进行分析比较和检验。经筛选，叶片、枝条及枝叶总生物量的枝长指数模型和基径的幂函数模型拟合最好，树干生物量则以树干长度与直径相乘积的指数模型最优。不论侧枝分龄与否和树干分段与否，所建模型均能获得较精确的估测结果。以５株活立木１９９２～１９９４年生长量观测数据为资料进行实测检验，估测值与伐倒实测值之间，树冠生物量相对误差平均为４．３１％，各株树干的相对误差都小于５％，地上部分总生物量平均只差２．５２％。
In estimating biomass in poplar plantations，a number of mathematical models andestimation methods have been used to process the data collected from a plantation of Popoluseuramericana for density trial.The resuIt shows:The most suitable model for foliage，shootand branch biomass is constructed with a exponential function of branch length as the inde-pendent variable,and a power function of branch base diameter;and the suitable model forstem biomass is constructed with a exponential function of the product of length and diameteras the independent varible. The average relative error between real and estimated biomass of 5sampled trees is 4.31％ forcrown，and2.52％ for stem.
关键词
杨树
生物量
估测模型
欧美杨
人工林
Popolus euranJericana,branch stem
biomass；estimating model
