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Deforestation in Latin America in the 2000s predominantly occurred outside of typical mature forests

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  • Corresponding author: niwj@aircas.ac.cn 
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    1. ■ The accuracy of existing carbon density maps is limited owing to the lack of direct measures of vertical forest structures.
    2. ■ The synergy of interferometric synthetic aperture radar (InSAR) data acquired before and after deforestation has been proposed as a direct measure of vertical forest structures.
    3. ■ An accurate map of carbon density in the deforested areas was produced using light detection and ranging (lidar) data, forestloss maps, and vertical forest structures.
    4. ■ New results have revealed that carbon loss caused by deforestation in the 2000s in Latin America was severely overestimated.
    5. ■ Knowledge of the role of Latin American forests in the 2000s in global carbon budgets has been challenged by this new result.
  • The role of tropical forests in the global carbon budget remains controversial, as carbon emissions from deforestation are highly uncertain. This high uncertainty arises from the use of either fixed forest carbon stock density or maps generated from satellite-based optical reflectance with limited sensitivity to biomass to generate accurate estimates of emissions from deforestation. New space missions aiming to accurately map the carbon stock density rely on direct measurements of the spatial structures of forests using lidar and radar. We found that lost forests are special cases, and their spatial structures can be directly measured by combining archived data acquired before and after deforestation by space missions principally aimed at measuring topography. Thus, using biomass mapping, we obtained new estimates of carbon loss from deforestation ahead of forthcoming space missions. Here, using a high-resolution map of forest loss and the synergy of radar and lidar to estimate the aboveground biomass density of forests, we found that deforestation in the 2000s in Latin America, one of the severely deforested regions, mainly occurred in forests with a significantly lower carbon stock density than typical mature forests. Deforestation areas with carbon stock densities lower than 20.0, 50.0, and 100.0 Mg C/ha accounted for 42.1%, 62.0%, and 83.3% of the entire deforested area, respectively. The average carbon stock density of lost forests was only 49.13 Mg C/ha, which challenges the current knowledge on the carbon stock density of lost forests (with a default value 100 Mg C/ha according to the Intergovernmental Panel on Climate Change Tier 1 estimates, or approximately 112 Mg C/ha used in other studies). This is demonstrated over both the entire region and the footprints of the spaceborne lidar. Consequently, our estimate of carbon loss from deforestation in Latin America in the 2000s was 253.0 ± 21.5 Tg C/year, which was considerably less than existing remote-sensing-based estimates, namely 400–600 Tg C/year. This indicates that forests in Latin America were most likely not a net carbon source in the 2000s compared to established carbon sinks. In previous studies, considerable effort has been devoted to rectify the underestimation of carbon sinks; thus, the overestimation of carbon emissions should be given sufficient consideration in global carbon budgets. Our results also provide solid evidence for the necessity of renewing knowledge on the role of tropical forests in the global carbon budget in the future using observations from new space missions.
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  • Cite this article:

    Zhang Z., Ni W., Quegan S., et al., (2024). Deforestation in Latin America in the 2000s predominantly occurred outside of typical mature forests. The Innovation 5(3), 100610. https://doi.org/10.1016/j.xinn.2024.100610
    Zhang Z., Ni W., Quegan S., et al., (2024). Deforestation in Latin America in the 2000s predominantly occurred outside of typical mature forests. The Innovation 5(3), 100610. https://doi.org/10.1016/j.xinn.2024.100610

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