Disentangling the Effects of Temperature, Moisture, and Substrate Availability on Soil CO2 Efflux

Mitra, Bhaskar; Miao, Guofang; Minick, Kevan; McNulty, Steve G.; Sun, Ge; Gavazzi, Michael; King, John S.; Noormets, Asko

doi:10.1029/2019jg005148

Title: Disentangling the Effects of Temperature, Moisture, and Substrate Availability on Soil CO₂ Efflux

Journal Article · 20 June 2019 · Journal of Geophysical Research. Biogeosciences

DOI: https://doi.org/10.1029/2019jg005148 · OSTI ID:1610890

^[1];

^[2]; Minick, Kevan ^[3];

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^[4]; King, John S. ^[3];

^[1]

Texas A & M Univ., College Station, TX (United States)
Univ. of Illinois at Urbana-Champaign, IL (United States)
North Carolina State Univ., Raleigh, NC (United States)
USDA Forest Service, Research Triangle Park NC (United States). Eastern Forest Environmental Threat Assessment Center

Soil respiration ($$R_s$$), the largest carbon emission flux in ecosystems, is usually modeled as an empirically parameterized function of temperature, and sometimes water availability. The likely contribution by other factors, such as carbohydrate substrate supply from photosynthesis, has been recognized, but modeling capacity to use this information is limited. Wavelet transformations of the residuals of a seasonal Q₁₀ temperature response model indicated structure at different temporal scales. In this work, we hypothesize that this indicates the lack of explicit representation of relevant processes in the models. Using cross-spectral analysis, we found that time series of photosynthetically active radiation explained most of the diurnal variation, temperature, explained variability at multiple time scales (diurnal-synoptic), whereas volumetric soil water content correlated with variability in Rs at scales 15-30 days. The results suggest that the time domains of influence for different driving variables of $$R_s$$ are discrete, and largely nonoverlapping, and represent functional relationships between soil biological activity and its constraints. Analysis of phase angles showed that $$R_s$$ lagged photosynthetically active radiation by 1.5-3.0 hr. As this time lag was the same in both young and mature trees, with more than fivefold difference in transport distances, we hypothesize that this finding adds to the body of literature that support the pressure-concentration-wave model of carbohydrate availability in plants.

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Research Organization:: North Carolina State University, Raleigh, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER); USDA; National Institute of Food and Agriculture (NIFA); US Forest Service, Eastern Forest Environmental Threat Assessment Center

Grant/Contract Number:: SC0006700; 7090112; 2011‐67009‐20089; 2014‐67003‐22068; 08‐JV‐11330147‐038; 13‐JV‐11330110‐081

OSTI ID:: 1610890

Journal Information:: Journal of Geophysical Research. Biogeosciences, Vol. 124, Issue 7; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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