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Comprehensive Biomass Benchmarking in TRENDY Models: Assessing Carbon Dynamics and Disturbance Effects

This study delves into biomass benchmarking across TRENDY models, addressing the variations in biomass estimates ranging from 400-800 PgC. It examines the impacts of human and natural disturbances, covering an expansive 44 Mkm² area influenced by anthropogenic activities and 2-3 Mkm² annually affected by fire. The research includes historical biomass data from 1850 to 2000 and presents a global biomass-age curve with age-corrected potential estimates. The findings reveal discrepancies in biomass measurements and highlight the implications for accurate carbon stock assessments in forest ecosystems.

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Comprehensive Biomass Benchmarking in TRENDY Models: Assessing Carbon Dynamics and Disturbance Effects

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  1. Biomass benchmarking • 400-800 PgC range in TRENDY models • Plot-scale and satellite benchmarking

  2. Biomass benchmarking • Human disturbance (44 Mkm2) and natural disturbance (i.e., fire: 2-3 Mkm2 a-1)

  3. Biomass benchmarking Global Forest Age

  4. Biomass benchmarking 1850 1870 …. 1990 2000 Global biomass-age curve

  5. Biomass benchmarking Potential biomass reduction with age (KgCm-2) 448 PgC-age corrected 752 PgC-potential Pan et al. 363±28 PgC

  6. Biomass benchmarking Standard ORCHIDEE biomass (tC ha-1) Age-corrected ORCHIDEE biomass (tC ha-1)

  7. Biomass benchmarking Underestimate (land cover?) Overestimate (Vcmax, turnover) Agreement (±25 KgC m-2)

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