Environmental forcing does not induce diel or synoptic variation in the carbon isotope content of forest soil respiration
Abstract
Recent studies have examined temporal fluctuations in the amount and carbon isotope content (δ13C) of CO2 produced by the respiration of roots and soil organisms. These changes have been correlated with diel cycles of environmental forcing (e.g., sunlight and soil temperature) and with synoptic-scale atmospheric motion (e.g., rain events and pressure-induced ventilation). We used an extensive suite of measurements to examine soil respiration over 2 months in a subalpine forest in Colorado, USA (the Niwot Ridge AmeriFlux forest). Observations included automated measurements of CO2 and δ13C of CO2 in the soil efflux, the soil gas profile, and forest air. There was strong diel variability in soil efflux but no diel change in the δ13C of the soil efflux (δR) or the CO2 produced by biological activity in the soil (δJ). Following rain, soil efflux increased significantly, but δR and δJ did not change. Temporal variation in the δ13C of the soil efflux was unrelated to measured environmental variables, and we failed to find an explanation for this unexpected result. Measurements of the δ13C of the soil efflux with chambers agreed closely with independent observations of the isotopic composition of soil CO2 production derived from soil gas well measurements. Deeper inmore »
- Authors:
-
- Univ. of Utah, Salt Lake City, UT (United States)
- Dalhousie Univ., Halifax, NS (Canada)
- St. Francis Xavier Univ., Antigonish, NS (Canada)
- Publication Date:
- Research Org.:
- Univ. of Utah, Salt Lake City, UT (United States)
- Sponsoring Org.:
- Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division
- OSTI Identifier:
- 1425452
- Grant/Contract Number:
- SC0010625
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Biogeosciences (Online)
- Additional Journal Information:
- Journal Name: Biogeosciences (Online); Journal Volume: 12; Journal Issue: 16; Journal ID: ISSN 1726-4189
- Publisher:
- European Geosciences Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Bowling, D. R., Egan, J. E., Hall, S. J., and Risk, D. A. Environmental forcing does not induce diel or synoptic variation in the carbon isotope content of forest soil respiration. United States: N. p., 2015.
Web. doi:10.5194/bg-12-5143-2015.
Bowling, D. R., Egan, J. E., Hall, S. J., & Risk, D. A. Environmental forcing does not induce diel or synoptic variation in the carbon isotope content of forest soil respiration. United States. https://doi.org/10.5194/bg-12-5143-2015
Bowling, D. R., Egan, J. E., Hall, S. J., and Risk, D. A. Mon .
"Environmental forcing does not induce diel or synoptic variation in the carbon isotope content of forest soil respiration". United States. https://doi.org/10.5194/bg-12-5143-2015. https://www.osti.gov/servlets/purl/1425452.
@article{osti_1425452,
title = {Environmental forcing does not induce diel or synoptic variation in the carbon isotope content of forest soil respiration},
author = {Bowling, D. R. and Egan, J. E. and Hall, S. J. and Risk, D. A.},
abstractNote = {Recent studies have examined temporal fluctuations in the amount and carbon isotope content (δ13C) of CO2 produced by the respiration of roots and soil organisms. These changes have been correlated with diel cycles of environmental forcing (e.g., sunlight and soil temperature) and with synoptic-scale atmospheric motion (e.g., rain events and pressure-induced ventilation). We used an extensive suite of measurements to examine soil respiration over 2 months in a subalpine forest in Colorado, USA (the Niwot Ridge AmeriFlux forest). Observations included automated measurements of CO2 and δ13C of CO2 in the soil efflux, the soil gas profile, and forest air. There was strong diel variability in soil efflux but no diel change in the δ13C of the soil efflux (δR) or the CO2 produced by biological activity in the soil (δJ). Following rain, soil efflux increased significantly, but δR and δJ did not change. Temporal variation in the δ13C of the soil efflux was unrelated to measured environmental variables, and we failed to find an explanation for this unexpected result. Measurements of the δ13C of the soil efflux with chambers agreed closely with independent observations of the isotopic composition of soil CO2 production derived from soil gas well measurements. Deeper in the soil profile and at the soil surface, results confirmed established theory regarding diffusive soil gas transport and isotopic fractionation. Deviation from best-fit diffusion model results at the shallower depths illuminated a pump-induced ventilation artifact that should be anticipated and avoided in future studies. There was no evidence of natural pressure-induced ventilation of the deep soil. However, higher variability in δ13C of the soil efflux relative to δ13C of production derived from soil profile measurements was likely caused by transient pressure-induced transport with small horizontal length scales.},
doi = {10.5194/bg-12-5143-2015},
journal = {Biogeosciences (Online)},
number = 16,
volume = 12,
place = {United States},
year = {Mon Aug 31 00:00:00 EDT 2015},
month = {Mon Aug 31 00:00:00 EDT 2015}
}
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Summer dry-down modulates the isotopic composition of soil CO2 production in snow-dominated landscapes
journal, May 2018
- Riveros-Iregui, Diego A.; Lorenzo, Theresa M.; Liang, Liyin L.
- PLOS ONE, Vol. 13, Issue 5
Application of a laser-based spectrometer for continuous insitu measurements of stable isotopes of soil CO2 in calcareous and acidic soils
posted_content, May 2018
- Jobin, Joseph; Christoph, Kulls; Matthias, Arend
- Soil Discussions
Application of a laser-based spectrometer for continuous in situ measurements of stable isotopes of soil CO2 in calcareous and acidic soils
text, January 2019
- Joseph, Jobin; Külls, Christoph; Arend, Matthias
- ETH Zurich