Abstract
The impact of more extreme climate conditions under global warming on soil organic carbon (SOC) dynamics remains unquantified. Here we estimate the response of SOC to climate extreme shifts under 1.5 °C warming by combining a space-for-time substitution approach and global SOC measurements (0–30 cm soil). Most extremes (22 out of 33 assessed extreme types) exacerbate SOC loss under warming globally, but their effects vary among ecosystems. Only decreasing duration of cold spells exerts consistent positive effects, and increasing extreme wet days exerts negative effects in all ecosystems. Temperate grasslands and croplands negatively respond to most extremes, while positive responses are dominant in temperate and boreal forests and deserts. In tundra, 21 extremes show neutral effects, but 11 extremes show negative effects with stronger magnitude than in other ecosystems. Our results reveal distinct, biome-specific effects of climate extremes on SOC dynamics, promoting more reliable SOC projection under climate change.
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Data availability
The 33 climate extreme indices can be accessed at https://doi.org/10.1594/PANGAEA.898014. Global mapping products generated in this study are publicly available and deposited to https://doi.org/10.6084/m9.figshare.22317202. Other data used in this study are the same to those used in ref. 21, which are publicly accessible. The coastline data in all maps can be gained from https://www.naturalearthdata.com/downloads/50m-physical-vectors/50m-coastline/.
Code availability
Code (R scripts)68 used to assess the data and generate the results is deposited at https://doi.org/10.6084/m9.figshare.22317202.
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Acknowledgements
This research has been financially supported by the National Natural Science Foundation of China (grant number 32241036, 32171639) and the National Key Research Program of the Ministry of Science and Technology of China (grant number 2021YFE0114500). Contributions of U.M. were supported through a US Department of Energy grant to the Sandia National Laboratories, which is a multi-mission laboratory managed and operated by National Technology and Engineering Solutions of Sandia LLC, a wholly owned subsidiary of Honeywell International Inc. for the US Department of Energy’s National Nuclear Security Administration under contract DE-NA-0003525.
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Z.L. conceived the study; M.W. and Z.L. led data assessment; Y.Y. and U.M. contributed to permafrost data; Z.L. and M.W. interpreted the results with the contribution of all authors; Z.L. and M.W. led the writing of the manuscript and all authors improved the manuscript.
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Nature Climate Change thanks Emanuele Lugato and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Extended data
Extended Data Fig. 2 The additional changes in soil organic carbon induced by climate extremes under a warmer and more extreme climate.
The dependence of additional changes in soil organic carbon (ΔSOCE) on the change levels of climate extremes under a warmer and more extreme climate. Grey grids indicate that the estimated dependence is statistically insignificant (P > 0.05). TS forests, tropical/subtropical forests; Med/Mon shrublands, Mediterranean/montane shrublands; TS grasslands/savannas, tropical/subtropical grasslands/savannas. Detailed descriptions of CEIs are shown in Supplementary Table 1.
Extended Data Fig. 3 The comparison of soil organic carbon changes induced by changes in extreme dry magnitude using our approach with file drought experimental results.
Comparison of soil organic carbon changes induced by changes in extreme dry magnitude (EDM). Deng et al. (2021) synthesized the data from field experiments. Biomes are grouped into tundra, shrublands, grasslands, and forests. Dots with bars show the mean effect sizes with 95% confidence intervals, and numbers besides them are sample sizes used to calculate the mean effect size. The actual drought levels (that is, the reduction of precipitation) in field drought experiments were normalized to annual mean precipitation. The change level in our estimation which is close most to the experimental change level was targeted to conduct the comparison.
Extended Data Fig. 4 The performance of random forest model.
The performance of random forest model on predicting soil organic carbon responses attributed to eight climate extremes under a warmer and more extreme climate. Detailed descriptions of climate extreme indices (CEIs) are shown in Supplementary Table 1.
Extended Data Fig. 5 The distribution of global wetlands and the location of soils with organic carbon stock of >300 Mg C ha–1 (0–30 cm) used in this study.
The wetland map data is obtained from http://www.wwfus.org/science/data.cfm.
Extended Data Fig. 6 The partial depended relationship of soil organic carbon changes with background climate extreme conditions.
The relationship of soil organic carbon changes (that is, ΔSOCE) with background climate extreme conditions. Partial dependence of ΔSOCE induced by a typical CEI on corresponding background CEI. Detailed descriptions of the eight CEIs are shown in Supplementary Table 1.
Extended Data Fig. 7 The global spatial pattern of absolute changes in soil organic carbon stock under a warmer and more extreme climate.
Global spatial pattern of absolute changes in soil organic carbon stock attributed to climate extreme shifts under a warmer and more extreme climate. a-h, eight climate extremes including heat wave magnitude (a) and frequency (b), cold wave magnitude (c) and frequency (d), extreme dry magnitude (e) and frequency (f), extreme wet magnitude (g) and frequency (h).
Extended Data Fig. 8 The uncertainty of soil organic carbon relative changes under a warmer and more extreme climate.
Uncertainty of soil organic carbon changes attributed to climate extreme shifts (ΔSOCE) under a warmer and more extreme climate. ΔSOCE is defined as the difference between percentage responses of SOC to W + E and that to W, which can also be explained as the additional changes in SOC induced by climate extremes. a-h, eight climate extremes including heat wave magnitude (a) and frequency (b), cold wave magnitude (c) and frequecy (d), extreme dry magnitude (e) and frequency (f), extreme wet magnitude (g) and frequency (h).
Extended Data Fig. 9 The uncertainty of soil organic carbon absolute changes attributed to climate extreme shifts (ΔSOCE, Mg C ha−1) under a warmer and more extreme climate.
The standard error was estimated based on 500 estimates of the random forest model. a-h, eight climate extremes including heat wave magnitude (a) and frequency (b), cold wave magnitude (c) and frequecy (d), extreme dry magnitude (e) and frequency (f), extreme wet magnitude (g) and frequency (h).
Extended Data Fig. 10 The latitudinal pattern of changes in soil organic under 1.5 °C warming plus the specified climate change shifts.
Latitudinal pattern of changes in soil organic carbon attributed to climate extremes (that is, ΔSOCE) under 1.5 °C warming plus the specified climate change shifts. ΔSOCE is defined as the difference between percentage responses of SOC to W + E and that to W, which can also be explained as the additional changes in SOC induced by climate extremes. a-h, eight climate extremes including heat wave magnitude (a) and frequency (b), cold wave magnitude (c) and frequecy (d), extreme dry magnitude (e) and frequency (f), extreme wet magnitude (g) and frequency (h). Black and green lines indicate the median and global average. Dashed lines show zero change, which is blocked by green lines in e and f.
Supplementary information
Supplementary Information
Supplementary Figs. 1–6 and Tables 1–6.
Supplementary Data 1
The detailed statistical results showed in Extended Data Fig. 1 and Supplementary Figs. 3, 4 and 5.
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Wang, M., Zhang, S., Guo, X. et al. Responses of soil organic carbon to climate extremes under warming across global biomes. Nat. Clim. Chang. 14, 98–105 (2024). https://doi.org/10.1038/s41558-023-01874-3
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DOI: https://doi.org/10.1038/s41558-023-01874-3
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