毛白杨及其杂种优良无性系生物量增长数学模型的研究

本文采用相对生长法系统地研究了毛白杨及其杂种无性系生物量增长及其各器官相对生物量的积累和分配规律；建立了干材、干皮、枝、叶、根以及干材、枝与叶等器官间相对生物量的各种数学模型．同时，还揭示出毛白杨及其杂种无性系幼林各器官的生物量因树龄而异，其中，干材生物量占主体．这为良种选育，速生、丰产栽培技术措施制定，提供理论依据．

STUDIES ON MATHEMATICAL MODEL OF BIOMASS INCREMENT FOR POPULUS TOMANTOSA ELITE CLONES

In this paper,the biomass increment and the relative biomass accumulation and distribution for Populus tomentosa and its hybrides clones were studied systematically by relative growth method.On the bisis of measured data,the mathematical model for relative biomass among different organs were established.Meanwhile it wasfound that the biomass of different organs for young plantation of Populus tomentosa and its hybrides varied with tree's ages,but the stem biomass held a dominant position.Therefore,this research provides a theoretical basis for elite variety selection and the formulation of fast-growing and highyield cultivation techniqes.