Abstract
Terrestrial ecosystem respiration increases exponentially with temperature, constituting a positive feedback loop accelerating global warming. However, the response of ecosystem respiration to temperature strongly depends on water availability, yet where and when the water effects are important, is presently poorly constrained, introducing uncertainties in climate–carbon cycle feedback projections. Here, we disentangle the effects of temperature and precipitation (a proxy for water availability) on ecosystem respiration by analysing eddy covariance CO2 flux measurements across 212 globally distributed sites. We reveal a threshold precipitation function, determined by the balance between precipitation and ecosystem water demand, which separates temperature-limited and water-limited respiration. Respiration is temperature limited for precipitation above that threshold function, whereas in drier areas water limitation reduces the temperature sensitivity of respiration and its positive feedback to global warming. If the trend of expansion of water-limited areas with warming climate over the last decades continues, the positive feedback of ecosystem respiration is likely to be weakened and counteracted by the increasing water limitation.
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Data availability
All data used for this study are publicly accessible and downloadable and all results of this study can be reproduced according to the methods provided. The FLUXNET2015 dataset used here are publicly available at https://fluxnet.org/data/fluxnet2015-dataset/. The CMIP6 data are publicly available at https://esgf-node.llnl.gov/projects/cmip6/. Information on the 212 sites used in this paper and their groupings are available on GitHub (https://github.com/chuixiangyi/Water-limitation).
Code availability
The Matlab code used for the analysis is available on GitHub (https://github.com/chuixiangyi/).
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Acknowledgements
This work used eddy covariance data acquired and shared by the FLUXNET community, including these networks: AmeriFlux, AfriFlux, AsiaFlux, CarboAfrica, CarboEuropeIP, CarboItaly, CarboMont, ChinaFlux, Fluxnet-Canada, GreenGrass, ICOS, KoFlux, LBA, NECC, OzFlux-TERN, TCOS-Siberia and USCCC. The FLUXNET eddy covariance data processing and harmonization were carried out by the ICOS Ecosystem Thematic Center, AmeriFlux Management Project and Fluxdata project of FLUXNET, with the support of CDIAC and the OzFlux, ChinaFlux and AsiaFlux offices. C.Y. completed this research when he was a Fulbright Visiting Professor at University of Innsbruck with support from the US-Austria Fulbright Program. D.C. is supported by the Swedish national strategic research area BECC. G.D. has received support for this research from the Swedish Research Council (VR; grant number 2022-04672). The research of M.R. is supported by the European Research Council (ERC-Synergy project RESILIENCE, proposal no. 101071417) and by the Dutch Research Council (NWO ‘Resilience in complex systems through adaptive spatial pattern formation’, project no. OCENW.M20.169). S.M. was supported by ERC grant 101001608. G.W. acknowledges support from Austrian Research Promotion Agency grant 878893 and the Austrian Science Fund (10.55776/PAT2661823). N.K. acknowledges funding from National Oceanic and Atmospheric Administration Educational Partnership Program with Minority-Serving Institutions—Cooperative Science Center for Earth System Sciences and Remote Sensing Technologies cooperative agreement grant NA22SEC4810016.
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C.Y., Q.Z. and G.D. conceived the project. Q.Z. performed data processing with R.L., Z.T. and J.H. Q.Z. and C.Y. conducted data analysis. C.Y. wrote the first version of the manuscript with Q.Z., E.K., R.L., D.C., G.W., Y.K., G.D., S.M., M.R., G.H. and W.F. All authors discussed the results and contributed to the writing and to the final manuscript.
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Extended data
Extended Data Fig. 1 The statistics of the empirical threshold model \(\tilde{P}(T)\).
The blue filled circles are the data of mean annual temperature and mean annual precipitation in B-group. The threshold curve (black line) is the exponential regression line with 95% confidence interval (shaded area), R2 = 0.53 and p < 0.01 for One-Tailed Test.
Extended Data Fig. 2 Differential sensitivity of Q10 to Dryness (DI).
212 sites of FLUXNET2015 were divided into six groups with six DI intervals: 0 < DI < 0.4 (9 sites); 0.4 < DI < 0.7 (61 sites); 0.7 < DI < 1.0 (58 sites); 1.0 < DI < 1.4 (38 sites); 1.4 < DI < 2.2 (23 sites); and DI > 2.2 (23 sites). The apparent group average Q10 were estimated by Q10 models (see Methods).
Extended Data Fig. 3 Differential sensitivity of Q10 to temperature revealed by Dryness (DI).
212 sites of FLUXNET2015 were divided into six groups with six DI intervals: 0 < DI < 0.4 (9 sites); 0.4 < DI < 0.7 (61 sites); 0.7 < DI < 1.0 (58 sites); 1.0 < DI < 1.4 (38 sites); 1.4 < DI < 2.2 (23 sites); and DI > 2.2 (23 sites). The filled circles and error bars represent DI-group means and their standard deviations, respectively. The blue line is the regression (y = -0.1719x + 3.2197, R2 = 0.63 for the data DI < 1, while the red line is the regression (y = -0.047x + 1.97, R2 = 0.93) for the data DI > 1.
Extended Data Fig. 4 The distribution and statistics of Q10 for each DI group.
212 sites of FLUXNET2015 were divided into six groups with six DI intervals: (a) 0 < DI < 0.4 (9 sites); (b) 0.4 < DI < 0.7 (61 sites); (c) 0.7 < DI < 1.0 (58 sites); (d) 1.0 < DI < 1.4 (38 sites); (e) 1.4 < DI < 2.2 (23 sites); and (f) DI > 2.2 (23 sites). Q10 was calculated with Q10 model (equation (14)) based on FLUXNET2015 ecosystem respiration \({R}_{e}^{{EC}}\) data and temperature data (see Methods).
Extended Data Fig. 5 The impact of precipitation (P) on ecosystem respiration (Re) across various time scales based on the data of Re and P from the same P-group sites.
(a) half-hourly; (b) daily; (c) weekly; (d) monthly; and (e) yearly. n is the number of scatter points.
Extended Data Fig. 6 The asymmetric effect of precipitation (P) on ecosystem respiration (Re).
(a) all sites; (b) T-group; (c) P-group; and (d) B-group. The y-axis represents the residuals of model Re(P) (equation(12)). The x-axis is coefficient of variation of monthly precipitation.
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Supplementary Methods 1–4, Figs. 1–4, Table 1 and references.
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Zhang, Q., Yi, C., Destouni, G. et al. Water limitation regulates positive feedback of increased ecosystem respiration. Nat Ecol Evol (2024). https://doi.org/10.1038/s41559-024-02501-w
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DOI: https://doi.org/10.1038/s41559-024-02501-w