燕山山地华北落叶松单株生物量与生产力研究

根据对33株华北落叶松标准木的生物量实测资料，对林木单株与器官生物量分配情况进行了探讨，建立了以胸径、树高为自变量的生物量预测模型；提出了在幼树期（树龄7-15a或胸径1．7-6．6cm）根茎比平均值为0．159，幼树期以后（当树龄超过15a或胸径大于6．6cm时）根冠比平均值为0．236，建立了以林龄、胸径为自变量的根冠比预测模型；以去皮材积一生物量模型为基础进行解析木的生产力模拟，多年平均生产力变化在211．258-4512．804g／a，16a以后进入速生期，到49a时年生产力水平仍很高，建议生产上主伐林龄应推迟到50a以后。

Study on individual biomass and productivity of Yanshan Mountain Larix principis-rupprechtii

According to the measured data from standard wood biomass of 33 plants(Larix principis-rupprechtii),the individual trees and biomass allocation were discussed,and a biomass estimation model was established with DBH and tree height as variables,presenting the ratio of roots and stems in the sapling period(tree age 7～15 a or DBH 1.7～6.6 cm) was 0.159 on the average,and the ratio of roots and shoots after the sapling period(when the stand age is greater than 15a time or DBH is more than 6.6cm) was 0.236 on the average,which were used as variables of the ratio for constructing a root and stem prediction model.Furthermore,the unbarked volume-biomass model was used as the basis for a productivity simulation of analytic trees,with multi-year average productivity changesin 211.258 g/a～4 512.804 g/a,indicating trees entered a fast-growing period after 16a,even with a very high level of productivity at 49a,and the production of harvesting age would be postponed to 50a later.