Abstract
Climate-driven forest mortality events have been extensively observed in recent decades, prompting the question of how quickly these affected forests can recover their functionality following such events. Here we assessed forest recovery in vegetation greenness (normalized difference vegetation index) and canopy water content (normalized difference infrared index) for 1,699 well-documented forest mortality events across 1,600 sites worldwide. By analysing 158,427 Landsat surface reflectance images sampled from these sites, we provided a global assessment on the time required for impacted forests to return to their pre-mortality state (recovery time). Our findings reveal a consistent decline in global forest recovery rate over the past decades indicated by both greenness and canopy water content. This decline is particularly noticeable since the 1990s. Further analysis on underlying mechanisms suggests that this reduction in global forest recovery rates is primarily associated with rising temperatures and increased water scarcity, while the escalation in the severity of forest mortality contributes only partially to this reduction. Moreover, our global-scale analysis reveals that the recovery of forest canopy water content lags significantly behind that of vegetation greenness, implying that vegetation indices based solely on greenness can overestimate post-mortality recovery rates globally. Our findings underscore the increasing vulnerability of forest ecosystems to future warming and water insufficiency, accentuating the need to prioritize forest conservation and restoration as an integral component of efforts to mitigate climate change impacts.
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Data availability
The tree mortality sites are available at https://www.tree-mortality.net/globaltreemortalitydatabase/ (ref. 5), https://doi.org/10.3897/oneeco.4.e37753 (ref. 57) and https://doi.org/10.1016/j.scitotenv.2021.151604 (ref. 58). These are summarized and available via figshare at https://doi.org/10.6084/m9.figshare.28375442 (ref. 104). The original NDVI and NDII data are available via figshare at https://doi.org/10.6084/m9.figshare.28375529 (ref. 105). The climate, vegetation and soil data are available via figshare at https://doi.org/10.6084/m9.figshare.28375550 (ref. 106). The world continental boundaries were sourced from the Environmental Systems Research Institute World Continents dataset at https://hub.arcgis.com/datasets/esri::world-continents/about. The temperature and precipitation data can be retrieved from https://data.ceda.ac.uk/badc/cru/data/cru_ts. The SPEI data are available at https://digital.csic.es/handle/10261/202305. The available water storage capacity, CEC, soil bulk density, soil clay and soil pH data were downloaded from https://daac.ornl.gov/SOILS/guides/HWSD.html. The STN can be obtained from https://data.isric.org/. The canopy height can be retrieved from https://webmap.ornl.gov/ogc/dataset.jsp?dg_id=10023_1. The global maximum rooting depth was derived from the Global Earth Observation for Integrated Water Resource Assessment (Earth2Observe) dataset available via figshare at https://doi.org/10.6084/m9.figshare.12047241.v6 (ref. 107). The tree density was derived from https://elischolar.library.yale.edu/yale_fes_data/1/. The forest age data were downloaded from https://doi.org/10.17871/ForestAgeBGI.2021. The SLA data were downloaded from https://www.try-db.org/. The forest biomes were classified as DBF, ENF and shrubland based on the European Space Agency/Climate Change Initiative Land Cover (http://maps.elie.ucl.ac.be/CCI/viewer/). The LAI was obtained from MOD15A2H.061 (https://lpdaac.usgs.gov/products/mod15a2hv061/).
Code availability
Java, MATLAB and Python Codes for the analysis of these data are available via GitHub at https://github.com/YCY-github-YCY/Forest (ref. 108). The Landsat-based NDVI and NDII, and digital elevation model (including elevation, slope and aspect) are calculated on GEE, which is available at https://code.earthengine.google.com/.
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Acknowledgements
This study was supported by the Second Tibetan Plateau Scientific Expedition and Research programme (2024QZKK0301) and the National Natural Science Foundation of China (41988101). A.C. acknowledges support from the US Geological Survey (G22AC00431) and the US Department of Agriculture National Institute of Food and Agriculture (2024-67019-42396). We thank J. Sun, Z. Zeng, Y. Guo and H. Zhuang for their technical assistance in performing PROSAIL model simulations. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the US Government.
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S.P. and A.C. designed the research. Y.Y. conducted all data processing, calculated RT and ran the model. S.H. and Y.Y. performed statistical analysis and drafted the figures. S.H. and Y.Y. wrote the first draft of the manuscript. W.M.H. collected the tree-mortality sites. Y.Y., S.H., A.C., J.P., S.M.M., C.D.A., W.M.H. and R.B.M. revised the manuscript. All authors discussed the design, methods and results and contributed to the text.
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Yan, Y., Hong, S., Chen, A. et al. Satellite-based evidence of recent decline in global forest recovery rate from tree mortality events. Nat. Plants 11, 731–742 (2025). https://doi.org/10.1038/s41477-025-01948-4
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DOI: https://doi.org/10.1038/s41477-025-01948-4
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