2024-03-29T09:33:00Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1557042019-08-06T06:44:05Zcom_10261_16com_10261_8com_10261_77col_10261_269col_10261_330
2017-09-27T08:25:02Z
urn:hdl:10261/155704
Winds induce CO2 exchange with the atmosphere and vadose zone transport in a karstic ecosystem
Sánchez-Cañete, Enrique P.
Oyonarte, Cecilio
Serrano-Ortiz, Penélope
Curiel Yuste, Jorge
Pérez-Priego, Óscar
Domingo, Francisco
Kowalski, Andrew S.
Ministerio de Ciencia e Innovación (España)
European Commission
Wind increases CO2
Wind induces CO2
Windy days increased NECB emissions and reduced soil CO2 concentrations
Depletion in bare soil
Under plant soil and induces CO2
Transport in surface soil and bedrock but not in subsurface
Research on the subterranean CO dynamics has focused individually on either surface soils or bedrock cavities, neglecting the interaction of both systems as a whole. In this regard, the vadose zone contains CO-enriched air (ca. 5% by volume) in the first meters, and its exchange with the atmosphere can represent from 10 to 90% of total ecosystem CO emissions. Despite its importance, to date still lacking are reliable and robust databases of vadose zone CO contents that would improve knowledge of seasonal-annual aboveground-belowground CO balances. Here we study 2.5 years of vadose zone CO dynamics in a semiarid ecosystem. The experimental design includes an integrative approach to continuously measure CO in vertical and horizontal soil profiles, following gradients from surface to deep horizons and from areas of net biological CO production (under plants) to areas of lowest CO production (bare soil), as well as a bedrock borehole representing karst cavities and ecosystem-scale exchanges. We found that CO followed similar seasonal patterns for the different layers, with the maximum seasonal values of CO delayed with depth (deeper more delayed). However, the behavior of CO transport differed markedly among layers. Advective transport driven by wind induced CO emission both in surface soil and bedrock, but with negligible effect on subsurface soil, which appears to act as a buffer impeding rapid CO exchanges. Our study provides the first evidence of enrichment of CO under plant, hypothesizing that CO-rich air could come from root zone or by transport from deepest layers through cracks and fissures.
2017-09-27T08:25:02Z
2017-09-27T08:25:02Z
2016-08
2017-09-27T08:25:02Z
artículo
Journal of Geophysical Research - Part G - BioGeo 121(8): 2049-2063 (2016)
http://hdl.handle.net/10261/155704
10.1002/2016JG003500
http://dx.doi.org/10.13039/501100000780
http://dx.doi.org/10.13039/501100004837
eng
Publisher's version
Sí
http://creativecommons.org/licenses/by/4.0/
openAccess
American Geophysical Union