A considerable fraction of soil-respired CO2 is not emitted directly to the atmosphere
AffiliationUniv Arizona, B2 Earthsci, Biosphere 2
Univ Arizona, Sch Geog & Dev
Univ Arizona, Dept Soil Water & Environm Sci
MetadataShow full item record
PublisherNATURE PUBLISHING GROUP
CitationSánchez-Cañete, Enrique & Barron-Gafford, Greg & Chorover, Jon. (2018). A considerable fraction of soil-respired CO2 is not emitted directly to the atmosphere. Scientific Reports. 8. 10.1038/s41598-018-29803-x.
Rights© The Author(s) 2018. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License.
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AbstractSoil CO2 efflux (F-soil) is commonly considered equal to soil CO2 production (R-soil), and both terms are used interchangeably. However, a non-negligible fraction of R-soil can be consumed in the subsurface due to a host of disparate, yet simultaneous processes. The ratio between CO2 efflux/O-2 influx, known as the apparent respiratory quotient (ARQ), enables new insights into CO2 losses from R-soil not previously captured by F-soil. We present the first study using continuous ARQ estimates to evaluate annual CO2 losses of carbon produced from R-soil. We found that up to 1/3 of R-soil was emitted directly to the atmosphere, whereas 2/3 of R-soil was removed by subsurface processes. These subsurface losses are attributable to dissolution in water, biological activities and chemical reactions. Having better estimates of R-soil is key to understanding the true influence of ecosystem production on R-soil, as well as the role of soil CO2 production in other connected processes within the critical zone.
NoteOpen access journal.
VersionFinal published version
SponsorsNSF [1417101, 1331408]; European Commission project DIESEL (FP7-PEOPLE-2013-IOF) ; Spanish Ministry of Economy and Competitiveness [IJCI-2016-30822]; program "Unidades de Excelencia Cientifica del Plan Propio de Investigacion de la Universidad de Granada"
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