The aboveground biomass (AGB) of shrubs and small trees is the main component for the productivity and carbon storage of understory vegetation in subtropical secondary forests. However, few allometric models exist to accurately evaluate understory biomass. To estimate the AGB of five common shrub (diameter at base < 5 cm, < 5 m high) and one small tree species (< 8 m high, trees's seed-ling), 206 individuals were harvested and species-specific and multi-species allometric models developed based on four predictors, height (H), stem diameter (D), crown area (Ca), and wood density (ρ). As expected, the six species possessed greater biomass in their stems compared with branches, with the lowest biomass in the leaves. Species-specific allometric models that employed stem diameter and the combined vari-ables of D 2 H and ρDH as predictors accurately estimated the components and total AGB, with R 2 values from 0.602 and 0.971. A multi-species shrub allometric model revealed that wood density × diameter × height (ρDH) was the best predic-tor, with R 2 values ranging from between 0.81 and 0.89 for the components and total AGB, respectively. These results indicated that height (H) and diameter (D) were effective predictors for the models to estimate the AGB of the six spe-cies, and the introduction of wood density (ρ) improved their accuracy. The optimal models selected in this study could be applied to estimate the biomass of shrubs and small trees in subtropical regions.

Cheng Huang;Chun Feng;Yuhua Ma;Hua Liu;Zhaocheng Wang;Shaobo Yang;Wenjing Wang;Songling Fu;Han Y.H.Chen

College of Forestry and Landscape Architecture,Anhui Agricultural University,130 Changjiang West Road, Hefei 230036,Anhui,People's Republic of China;Faculty of Natural Resources Management,Lakehead University,955 Oliver Road,Thunder Bay,ON P7B 5E1, Canada

林业研究（英文版）

[1]Cheng Huang;Chun Feng;Yuhua Ma;Hua Liu;Zhaocheng Wang;Shaobo Yang;Wenjing Wang;Songling Fu;Han Y.H.Chen-.Allometric models for aboveground biomass of six common subtropical shrubs and small trees)[J].林业研究（英文版）,2022(04):1317-1328

Allometric

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