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长白山金沟岭杨桦次生林下幼树生物量模型
张梦弢,亢新刚,RosliRH,高祥,徐光
0
(北京林业大学省部共建森林培育与保护教育部重点实验室;吉林省汪清林业局)
摘要:
为了对杨桦次生林下生物量模型进行补充研究,以长白山金沟岭林场杨桦次生林固定样地为研究对象,采用样地抽样的方法对林下主要树种幼树进行抽样,运用异速生长方程对幼树生物量模型进行拟合。结果表明,林下主要树种幼树生物量模型呈异速生长关系,自变量以地径D0,树高H最为紧密。其中,仅以地径D0作为单一自变量的模型精度明显低于以地径D0和树高H为自变量的模型精度;调整系数Radj2均在0.9以上,平均预测误差MPE范围在5%~49%之间,椴树的枝、叶、根和地上生物量,色木的枝生物量模型相对较差,平均预测误差均达到了40%以上;其次,根茎比与地径D0呈明显负相关关系,与树高H相关性不显著,调整系数Radj2较低,范围仅为0.053~0.507之间。最后,主要树种幼树生物量随着郁闭度的增大,表现依次下降的趋势,即W(0.6)>W(0.8)>W(1.0)。
关键词:  杨桦次生林  生物量  幼树  根茎比
DOI:
基金项目:“十二五”农村领域国家科技计划(2012BAD22B0203)
Biomass model for polar-birch secondary forest saplings in Jingouling forest farmof Changbai Mountain, Northeast China
ZHANG Meng-tao,KANG Xin-gang,Rosli R H,GAO Xiang,XU Guang
(Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University;Wangqing Forestry Bureau of Jilin Province)
Abstract:
In order to provide complementary information of biomass of polar-birch secondary forest sapling, plot sampling method was applied into the understory species saplings, and allometric equations were used to simulate the sapling biomass. Sapling biomass of the dominant species can be well simulated in allometric equations, and ground diameter (D0) and tree height (H) were the optimal independent variables. The coefficient of determination was 0.9, and mean prediction error ranged from 5% to 49%; the precision of models using only ground diameter (D0) were lower than that of ground diameter (D0) and tree height (H). Negative association was observed between root-shoot ratio and ground diameter (D0), and no relevant between root-shoot ratio and tree height (H); sapling biomass of dominant species decreased with canopy density increased.
Key words:  polar-birch secondary forest  biomass  sapling  root- shoot ratio

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