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    Description

    Several studies have reported different estimates for forest biomass carbon (C) stocks in China. The discrepancy among these estimates may be largely attributed to the methods used. In this study, we used three methods [mean biomass density method (MBM), mean ratio method (MRM), and continuous biomass expansion factor (BEF) method (abbreviated as CBM)] applied to forest inventory data to estimate China's forest biomass C stocks and their changes from 1984 to 2003. The three methods generated various estimates of the biomass C stocks: the lowest (4.0–5.9 Pg C) from CBM and the highest (5.7–7.7 Pg C) from MBM, with an intermediate estimate (4.2–6.2 Pg C) from MRM. Forest age class is a major factor responsible for these method-induced differences. MBMoverestimates biomass for youngaged forests, but underestimates biomass for old-aged forests; while the reverse is true for MRM. Further, the three methods resulted in different estimates of biomass C stocks for different forest types. For temperate/subtropical mixed forests, MBM generated a 92% higher estimate than CBM and MRM generated a 14% lower than CBM. The degree of the overestimates is closely related with the proportion of young-aged forest within total area of each forest type.

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    Citation

    Guo, Zhaodi; Fang, Jingyun; Pan, Yude; Birdsey, Richard. 2010. Inventory-based estimates of forest biomass carbon stocks in China: A comparison of three methods. Forest Ecology and Management. 259(7): 1225-1231.

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    Keywords

    China, Biomass expansion factor (BEF), Forest age class, Forest biomass, Forest type, Mean biomass

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https://www.fs.usda.gov/treesearch/pubs/53570