skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Journal Article · · Global Change Biology
DOI:https://doi.org/10.1111/gcb.14517· OSTI ID:1505337
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)

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-00OR22725; SC0014374; FC02-06ER64157; SC0010740; SC0016590
OSTI ID:
1505337
Alternate ID(s):
OSTI ID: 1485699
Journal Information:
Global Change Biology, Vol. 25, Issue 3; ISSN 1354-1013
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 59 works
Citation information provided by
Web of Science

References (67)

Deconvolution analysis to quantify autotrophic and heterotrophic respiration and their temperature sensitivities journal August 2010
Soil warming and trace gas fluxes: experimental design and preliminary flux results journal February 1993
Microbial temperature sensitivity and biomass change explain soil carbon loss with warming journal September 2018
Patterns of substrate utilization during long-term incubations at different temperatures journal November 2008
Microbial mediation of carbon-cycle feedbacks to climate warming journal December 2011
Evaluating soil microbial carbon use efficiency explicitly as a function of cellular processes: implications for measurements and models journal August 2018
Soil carbon sensitivity to temperature and carbon use efficiency compared across microbial-ecosystem models of varying complexity journal January 2014
Substrate supply, fine roots, and temperature control proteolytic enzyme activity in temperate forest soils journal April 2011
Environmental stress response limits microbial necromass contributions to soil organic carbon journal June 2015
Elucidation of the source and turnover of water soluble and microbial biomass carbon in agricultural soils journal May 2000
Microbial physiology and soil CO 2 efflux after 9 years of soil warming in a temperate forest - no indications for thermal adaptations journal September 2015
Nitrogen fertilization decreases forest soil fungal and bacterial biomass in three long-term experiments journal February 2006
Environmental and stoichiometric controls on microbial carbon-use efficiency in soils: Research review journal July 2012
Bacterial Growth Efficiency in Natural Aquatic Systems journal November 1998
Stoichiometry of microbial carbon use efficiency in soils journal May 2016
Comparison of temperature effects on soil respiration and bacterial and fungal growth rates journal March 2005
Turnover of carbon through the microbial biomass in soils with different texture journal January 1991
Does declining carbon-use efficiency explain thermal acclimation of soil respiration with warming? journal October 2012
Separating cellular metabolism from exoenzyme activity in soil organic matter decomposition journal April 2014
Soil respiration does not acclimatize to warmer temperatures when modeled over seasonal timescales journal June 2012
Statistical analysis in the estimation of maintenance and true growth yield coefficients journal April 1984
Modeling soil metabolic processes using isotopologue pairs of position-specific 13C-labeled glucose and pyruvate journal September 2011
Ecological forecasting and data assimilation in a data-rich era journal July 2011
The role of data assimilation in predictive ecology journal May 2014
Optimal metabolic regulation along resource stoichiometry gradients journal July 2017
Long-term pattern and magnitude of soil carbon feedback to the climate system in a warming world journal October 2017
Plant, microbial and ecosystem carbon use efficiencies interact to stabilize microbial growth as a fraction of gross primary production journal February 2017
Microbial carbon use efficiency: accounting for population, community, and ecosystem-scale controls over the fate of metabolized organic matter journal February 2016
Differential effects of warming and nitrogen fertilization on soil respiration and microbial dynamics in switchgrass croplands journal April 2018
A framework for representing microbial decomposition in coupled climate models journal August 2011
Microbial models with data-driven parameters predict stronger soil carbon responses to climate change journal March 2015
Microbial community response to varying magnitudes of desiccation in soil: A test of the osmolyte accumulation hypothesis journal February 2013
Seasonal dynamics of soil respiration and N mineralization in chronically warmed and fertilized soils journal March 2011
Contributions of aboveground litter, belowground litter, and root respiration to total soil respiration in a temperate mixed hardwood forest journal July 1993
Soil microbial carbon turnover decreases with increasing molecular size journal July 2013
The maintenance energy of bacteria in growing cultures journal October 1965
Long-term sensitivity of soil carbon turnover to warming journal January 2005
A Bayesian approach to stochastic capture zone delineation incorporating tracer arrival times, conductivity measurements, and hydraulic head observations: A BAYESIAN APPROACH TO CAPTURE ZONE DELINEATION journal May 2003
Global soil carbon projections are improved by modelling microbial processes journal July 2013
Global pattern and controls of soil microbial metabolic quotient journal May 2017
Decomposition of rice straw and microbial carbon use efficiency under different soil temperatures and moistures journal October 2000
The temperature response of soil microbial efficiency and its feedback to climate journal January 2013
Response of soil microbial biomass and community composition to chronic nitrogen additions at Harvard forest journal July 2004
A theoretical reassessment of microbial maintenance and implications for microbial ecology modeling journal April 2012
Why environmental scientists are becoming Bayesians: Modelling with Bayes journal December 2004
Accelerated microbial turnover but constant growth efficiency with warming in soil journal September 2014
The contentious nature of soil organic matter journal November 2015
Modeling adaptation of carbon use efficiency in microbial communities journal October 2014
Changes in soil microbial biomass, metabolic quotient, and organic matter turnover under Hieracium ( H. pilosella L.) journal December 1999
Toward more realistic projections of soil carbon dynamics by Earth system models: SOIL CARBON MODELING journal January 2016
Parameter estimation for models of ligninolytic and cellulolytic enzyme kinetics journal May 2012
Thermal acclimation in widespread heterotrophic soil microbes journal January 2013
Long-term forest soil warming alters microbial communities in temperate forest soils journal February 2015
Soil Warming and Carbon-Cycle Feedbacks to the Climate System journal December 2002
Microbial seed banks: the ecological and evolutionary implications of dormancy journal January 2011
Stabilization mechanisms of soil organic matter: Implications for C-saturation of soils journal January 2002
Development of microbial-enzyme-mediated decomposition model parameters through steady-state and dynamic analyses journal January 2013
Explicitly representing soil microbial processes in Earth system models: Soil microbes in earth system models journal October 2015
Soil-carbon response to warming dependent on microbial physiology journal April 2010
Temperature acclimation and adaptation of enzyme physiology in Neurospora discreta journal October 2018
Thermal adaptation of decomposer communities in warming soils journal January 2013
Probabilistic inversion of a terrestrial ecosystem model: Analysis of uncertainty in parameter estimation and model prediction: PROBABILISTIC INVERSION OF TERRESTRIAL ECOSYSTEM journal May 2006
Thermal adaptation of soil microbial respiration to elevated temperature journal December 2008
Survival of the soil microbial biomass at elevated temperatures journal January 1990
Microbial biomass, functional capacity, and community structure after 12 years of soil warming journal November 2008
Carbon use efficiency of microbial communities: stoichiometry, methodology and modelling journal April 2013
Application macroscopic principles to microbial metabolism journal May 2009

Cited By (3)

Priming of soil organic carbon decomposition induced by exogenous organic carbon input: a meta-analysis journal August 2019
Soil microbial biomass increases along elevational gradients in the tropics and subtropics but not elsewhere journal October 2019
Metabolic tradeoffs and heterogeneity in microbial responses to temperature determine the fate of litter carbon in simulations of a warmer world journal January 2019