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以西安市常见的4种绿化灌木(小叶女贞、雀舌黄杨、紫叶小檗、大叶黄杨)为研究对象,利用不同函数和自变量构建单一物种的器官及个体生物量估算模型,筛选出相关性最高、拟合度最好的模型作为生物量最佳估算模型.结果表明:4种灌木各器官及个体生物量最优估算模型除大叶黄杨叶生物量模型为对数函数(VAR)模型外,其余无论是器官生物量模型还是个体生物量模型均为幂函数(CAR)模型.模型包含的自变量有基径、植株冠幅直径、植株冠幅直径与株高乘积、植冠面积和植冠体积.大叶黄杨和其他3种灌木在自变量选取上有着明显不同.大叶黄杨生物量模型主要以基径为自变量,其他3种灌木生物量模型主要以与冠幅相关的因子为自变量.
Four common green shrubs (Ligustrum lucidum, Spatharanthus syriacus, Pseudostellaria barbata and Euonymus japonicus) were selected as the research object in this paper. Organizations and individual biomass estimation models of single species were constructed by using different functions and independent variables. The highest fitting degree and the best fitting degree as the best estimation model of biomass.The results showed that the model of optimal biomass for all four shrubs except biomass model was logarithmic function (VAR) model , The rest of the biomass model and organ biomass model are both power model (CAR) .The independent variables included in the model are the base diameter, the diameter of the plant crown, the product of the crown diameter and plant height, the area of the plant crown and The volume of canopy, the volume of Populus euphratica and the other three kinds of shrubs were significantly different in the selection of independent variables.The biomass of Euonymus japonicus was mainly based on the base diameter as the independent variable, while the other three shrub biomass models were mainly related to the crown width-related factors For the independent variables.