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Allometric equation and biomass estimation of Eucalyptus in Fujian

ZHENG Xiaoman1,2, WENG Xian3, OU Linglong1,4, REN Yin1   

  1. 1 Key Laboratory of Urban Environment and Health, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, Fujian, China;
    2 University of Chinese Academy of Sciences, Beijing, 100049, China;
    3 Fujian Jianyang Fanqiao State Owned Forest Farm, Nanping, 354200, Fujian, China;
    4 College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
  • Received:2022-03-02 Revised:2022-06-28 Online:2022-06-30

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

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