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Title: Reduced carbon use efficiency and increased microbial turnover with soil warming

Abstract

Global soil carbon (C) stocks are expected to decline with warming, and changes in microbial processes are key to this projection. However, warming responses of critical microbial parameters such as carbon use efficiency (CUE) and biomass turnover (rB) are not well understood. Here, we determine these parameters using a probabilistic inversion approach that integrates a microbial-enzyme model with 22 years of carbon cycling measurements at Harvard Forest. We find that increasing temperature reduces CUE but increases rB, and that two decades of soil warming increases the temperature sensitivities of CUE and rB. These temperature sensitivities, which are derived from decades-long field observations, contrast with values obtained from short-term laboratory experiments. We also show that long-term soil C flux and pool changes in response to warming are more dependent on the temperature sensitivity of CUE than that of rB. Using the inversion-derived parameters, we project that chronic soil warming at Harvard Forest over six decades will result in soil C gain of <1.0% on average (1 st and 3 rd quartiles: 3.0% loss and 10.5% gain) in the surface mineral horizon. Our results demonstrate that estimates of temperature sensitivity of microbial CUE and rB can be obtained and evaluated rigorously bymore » integrating multidecadal datasets. This approach can potentially be applied in broader spatiotemporal scales to improve long-term projections of soil C feedbacks to climate warming.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4];  [5];  [6];  [6];  [7];  [8]
  1. Tennessee State Univ., Nashville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Oklahoma, Norman, OK (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of California, Irvine, CA (United States)
  5. Univ. of New Hampshire, Durham, NH (United States)
  6. Univ. of Oklahoma, Norman, OK (United States)
  7. Northern Arizona Univ., Flagstaff, AZ (United States)
  8. Marine Biological Lab., Woods Hole, MA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1505337
Alternate Identifier(s):
OSTI ID: 1485699
Grant/Contract Number:  
AC05-00OR22725; SC0014374; FC02-06ER64157; SC0010740; SC0016590
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Global Change Biology
Additional Journal Information:
Journal Volume: 25; Journal Issue: 3; Journal ID: ISSN 1354-1013
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; carbon use efficiency (CUE); data‐model integration; Harvard forest; microbial biomass turnover (rB); soil warming; temperature sensitivity

Citation Formats

Li, Jianwei, Wang, Gangsheng, Mayes, Melanie A., Allison, Steven D., Frey, Serita D., Shi, Zheng, Hu, Xiao ‐Ming, Luo, Yiqi, and Melillo, Jerry M.. Reduced carbon use efficiency and increased microbial turnover with soil warming. United States: N. p., 2018. Web. doi:10.1111/gcb.14517.
Li, Jianwei, Wang, Gangsheng, Mayes, Melanie A., Allison, Steven D., Frey, Serita D., Shi, Zheng, Hu, Xiao ‐Ming, Luo, Yiqi, & Melillo, Jerry M.. Reduced carbon use efficiency and increased microbial turnover with soil warming. United States. doi:10.1111/gcb.14517.
Li, Jianwei, Wang, Gangsheng, Mayes, Melanie A., Allison, Steven D., Frey, Serita D., Shi, Zheng, Hu, Xiao ‐Ming, Luo, Yiqi, and Melillo, Jerry M.. Mon . "Reduced carbon use efficiency and increased microbial turnover with soil warming". United States. doi:10.1111/gcb.14517.
@article{osti_1505337,
title = {Reduced carbon use efficiency and increased microbial turnover with soil warming},
author = {Li, Jianwei and Wang, Gangsheng and Mayes, Melanie A. and Allison, Steven D. and Frey, Serita D. and Shi, Zheng and Hu, Xiao ‐Ming and Luo, Yiqi and Melillo, Jerry M.},
abstractNote = {Global soil carbon (C) stocks are expected to decline with warming, and changes in microbial processes are key to this projection. However, warming responses of critical microbial parameters such as carbon use efficiency (CUE) and biomass turnover (rB) are not well understood. Here, we determine these parameters using a probabilistic inversion approach that integrates a microbial-enzyme model with 22 years of carbon cycling measurements at Harvard Forest. We find that increasing temperature reduces CUE but increases rB, and that two decades of soil warming increases the temperature sensitivities of CUE and rB. These temperature sensitivities, which are derived from decades-long field observations, contrast with values obtained from short-term laboratory experiments. We also show that long-term soil C flux and pool changes in response to warming are more dependent on the temperature sensitivity of CUE than that of rB. Using the inversion-derived parameters, we project that chronic soil warming at Harvard Forest over six decades will result in soil C gain of <1.0% on average (1st and 3rd quartiles: 3.0% loss and 10.5% gain) in the surface mineral horizon. Our results demonstrate that estimates of temperature sensitivity of microbial CUE and rB can be obtained and evaluated rigorously by integrating multidecadal datasets. This approach can potentially be applied in broader spatiotemporal scales to improve long-term projections of soil C feedbacks to climate warming.},
doi = {10.1111/gcb.14517},
journal = {Global Change Biology},
issn = {1354-1013},
number = 3,
volume = 25,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
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