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Title: Globally rising soil heterotrophic respiration over recent decades

Abstract

Global soils store at least twice as much carbon as Earth’s atmosphere1,2. The global soil-to-atmosphere (or total soil respiration, RS) carbon dioxide (CO2) flux is increasing3,4, but the degree to which climate change will stimulate carbon losses from soils as a result of heterotrophic respiration (RH) remains highly uncertain5–8. Here we use an updated global soil respiration database9 to show that the observed soil surface RH:RS ratio increased significantly, from 0.54 to 0.63, between 1990 and 2014 (P = 0.009). Three additional lines of evidence provide support for this finding. By analysing two separate global gross primary production datasets10,11, we find that the ratios of both RH and RS to gross primary production have increased over time. Similarly, significant increases in RH are observed against the longest available solar-induced chlorophyll fluorescence global dataset, as well as gross primary production computed by an ensemble of global land models. We also show that the ratio of night-time net ecosystem exchange to gross primary production is rising across the FLUXNET201512 dataset. All trends are robust to sampling variability in ecosystem type, disturbance, methodology, CO2 fertilization effects and mean climate. Taken together, our findings provide observational evidence that global RH is rising, probably inmore » response to environmental changes, consistent with metaanalyses13–16 and long-term experiments17. This suggests that climate-driven losses of soil carbon are currently occurring across many ecosystems, with a detectable and sustained trend emerging at the global scale.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [2];  [3]
  1. BATTELLE (PACIFIC NW LAB)
  2. Ohio State University
  3. University of California, Berkeley
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1557636
Report Number(s):
PNNL-SA-124718
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Nature
Additional Journal Information:
Journal Volume: 560; Journal Issue: 7716
Country of Publication:
United States
Language:
English

Citation Formats

Bond-Lamberty, Benjamin, Bailey, Vanessa L., Chen, Min, Gough, Christopher, and Vargas, Rodrigo. Globally rising soil heterotrophic respiration over recent decades. United States: N. p., 2018. Web. doi:10.1038/s41586-018-0358-x.
Bond-Lamberty, Benjamin, Bailey, Vanessa L., Chen, Min, Gough, Christopher, & Vargas, Rodrigo. Globally rising soil heterotrophic respiration over recent decades. United States. doi:10.1038/s41586-018-0358-x.
Bond-Lamberty, Benjamin, Bailey, Vanessa L., Chen, Min, Gough, Christopher, and Vargas, Rodrigo. Wed . "Globally rising soil heterotrophic respiration over recent decades". United States. doi:10.1038/s41586-018-0358-x.
@article{osti_1557636,
title = {Globally rising soil heterotrophic respiration over recent decades},
author = {Bond-Lamberty, Benjamin and Bailey, Vanessa L. and Chen, Min and Gough, Christopher and Vargas, Rodrigo},
abstractNote = {Global soils store at least twice as much carbon as Earth’s atmosphere1,2. The global soil-to-atmosphere (or total soil respiration, RS) carbon dioxide (CO2) flux is increasing3,4, but the degree to which climate change will stimulate carbon losses from soils as a result of heterotrophic respiration (RH) remains highly uncertain5–8. Here we use an updated global soil respiration database9 to show that the observed soil surface RH:RS ratio increased significantly, from 0.54 to 0.63, between 1990 and 2014 (P = 0.009). Three additional lines of evidence provide support for this finding. By analysing two separate global gross primary production datasets10,11, we find that the ratios of both RH and RS to gross primary production have increased over time. Similarly, significant increases in RH are observed against the longest available solar-induced chlorophyll fluorescence global dataset, as well as gross primary production computed by an ensemble of global land models. We also show that the ratio of night-time net ecosystem exchange to gross primary production is rising across the FLUXNET201512 dataset. All trends are robust to sampling variability in ecosystem type, disturbance, methodology, CO2 fertilization effects and mean climate. Taken together, our findings provide observational evidence that global RH is rising, probably in response to environmental changes, consistent with metaanalyses13–16 and long-term experiments17. This suggests that climate-driven losses of soil carbon are currently occurring across many ecosystems, with a detectable and sustained trend emerging at the global scale.},
doi = {10.1038/s41586-018-0358-x},
journal = {Nature},
number = 7716,
volume = 560,
place = {United States},
year = {2018},
month = {8}
}

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