福建桉树异速生长方程与生物量估算*

doi:10.7523/j.ucas.2022.074

摘要/Abstract

摘要： 森林生态系统中单木生物量的估算是区域森林生物量估算的基础。本研究旨在为福建地区桉树(Eucalyptus grandis x urophylla)建立可靠有效的单木异速生长方程,以提高该区域桉树生物量估算精度,为桉树的可持续林业发展提供基础支撑数据。本文以我国南方主要速生丰产树种桉树为研究对象,利用野外破坏性实测的90棵桉树解析木数据,研究桉树单木器官生物量的分配及规律,构建最佳单木异速生长方程,计算桉树根冠比并将其应用于桉树树根生物量的估算。结果表明：1）桉树生物量的分配策略如下：随着林龄的增大,桉树树干的生物量分配比例不断增多,而树枝、树叶和树根的生物量分配比例不断减少。2）应用桉树分林龄的根冠比数据估算桉树树根生物量是最为可行且有效的方法。3）在桉树生物量的异速生长方程构建中,乘幂方程优于线性方程,最优自变量则根据各器官有所差异。本文的研究成果可为桉树人工林生物量精确估算提供数据和理论支持,也对物种生长规律、生存策略、乃至森林生态管理等方面的研究具有重要意义。

关键词: 桉树, 单木生物量, 器官分配, 根冠比, 异速生长方程

Abstract: The estimation of forest biomass at individual tree scale is the basis for the estimation of forest biomass at the regional scale. This paper aims at developing a reliable and effective allometric equation for Eucalyptus in Fujian in order to improve the estimation accuracy of Eucalyptus biomass in this area and to provide basic supporting data for the sustainable forestry development of Eucalyptus. This study takes Eucalyptus, a major fast-growing and productive tree species in Southern China, as the research object. Using 90 Eucalyptus woods harvested in the field, the partitioning of Eucalyptus biomass among organs are studied, the optimal allometric equations are constructed, and the Eucalyptus root/shoot ratios are calculated and applied to estimate Eucalyptus root biomass. Results show Eucalyptus has the following biomass allocation strategies: the biomass proportion of trunks increases with increasing stand age, while that of branches, leaves, and roots decreases. The most feasible and effective way to estimate Eucalyptus root biomass is to use root/shoot ratio data with stand age. In the construction of the allometric equation for Eucalyptus biomass, the multiplicative power equation is better than the linear equation, and the optimal independent variable varied by organ type. This paper provides data and theoretical support for the accurate estimation of Eucalyptus plantation biomass, and has implications for species growth patterns, survival strategies, and even forest ecological management.

Key words: Eucalyptus, individual tree biomass, organ partitioning, root/shoot ratio, allometric equations

中图分类号:

S758

郑小曼, 翁闲, 欧玲珑, 任引. 福建桉树异速生长方程与生物量估算^*[J]. 中国科学院大学学报, DOI: 10.7523/j.ucas.2022.074.

ZHENG Xiaoman, WENG Xian, OU Linglong, REN Yin. Allometric equation and biomass estimation of Eucalyptus in Fujian[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2022.074.

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福建桉树异速生长方程与生物量估算^*

Allometric equation and biomass estimation of Eucalyptus in Fujian

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