Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.agrformet.2016.12.021 |
Subterranean ventilation of allochthonous CO2 governs net CO2 exchange in a semiarid Mediterranean grassland | |
Lopez-Ballesteros, Ana1,2; Serrano-Ortiz, Penelope2,3; Kowalski, Andrew S.2,4; Sanchez-Canete, Enrique P.2,5; Scott, Russell L.6; Domingo, Francisco1 | |
通讯作者 | Lopez-Ballesteros, Ana |
来源期刊 | AGRICULTURAL AND FOREST METEOROLOGY
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ISSN | 0168-1923 |
EISSN | 1873-2240 |
出版年 | 2017 |
卷号 | 234页码:115-126 |
英文摘要 | Recent research highlights the important role of (semi-)arid ecosystems in the global carbon (C) cycle. However, detailed process based investigations are still necessary in order to fully understand how dry lands behave and to determine the main factors currently affecting their C balance with the aim of predicting how climate change will affect their structure and functions. Here, we explore the potential biological and non-biological processes that may compose net CO2 exchange in a semiarid grassland in southeast Spain by means of eddy covariance measurements registered over six hydrological years (2009-2015). Results point out the great importance of subterranean ventilation, an advective transport process causing net CO2 release, especially during drought periods and under high-turbulence conditions. Accordingly, extreme CO2 release, far exceeding that found in the literature, was measured over the whole study period (2009-2015) averaging 230 g Cm-2 year(-1); this occurred mostly during the dry season and was very unlikely to correspond to concurrent biological activity and variations of in situ organic C pools. Underground CO2 concentrations corroborate this finding. In this regard, the potential origins of the released CO2 could be geological degassing and/or subterranean translocation of CO2 in both gaseous and aqueous phases. However, future research is needed in order to understand how CO2 transport and production processes interact and modulate drylands’ terrestrial C balance. Overall, the present study exposes how subterranean ventilation and hydrogeochemistry can complicate the interpretation of the terrestrial C cycle. (C) 2016 Elsevier B.V. All rights reserved. |
英文关键词 | Net CO2 flux Advective transport Eddy covariance Vadose zone Drought Atmospheric pumping |
类型 | Article |
语种 | 英语 |
国家 | Spain ; USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000395227000010 |
WOS关键词 | CARBON-DIOXIDE ; ORGANIC-MATTER ; SOIL ; ECOSYSTEM ; FLUXES ; BALANCE ; VARIABILITY ; ENVIRONMENT ; EFFLUX ; HIDDEN |
WOS类目 | Agronomy ; Forestry ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Agriculture ; Forestry ; Meteorology & Atmospheric Sciences |
来源机构 | University of Arizona |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/197099 |
作者单位 | 1.CSIC, Dept Desertificat & Geoecol, Estn Expt Zonas Aridas, Almeria, Spain; 2.Univ Granada, CEAMA, IISTA, Granada, Spain; 3.Univ Granada, Dept Ecol, Granada, Spain; 4.Univ Granada, Dept Fis Aplicada, Granada, Spain; 5.Univ Arizona, Biosphere 2, Tucson, AZ USA; 6.Southwest Watershed Res Ctr, USDA ARS, Tucson, AZ USA |
推荐引用方式 GB/T 7714 | Lopez-Ballesteros, Ana,Serrano-Ortiz, Penelope,Kowalski, Andrew S.,et al. Subterranean ventilation of allochthonous CO2 governs net CO2 exchange in a semiarid Mediterranean grassland[J]. University of Arizona,2017,234:115-126. |
APA | Lopez-Ballesteros, Ana,Serrano-Ortiz, Penelope,Kowalski, Andrew S.,Sanchez-Canete, Enrique P.,Scott, Russell L.,&Domingo, Francisco.(2017).Subterranean ventilation of allochthonous CO2 governs net CO2 exchange in a semiarid Mediterranean grassland.AGRICULTURAL AND FOREST METEOROLOGY,234,115-126. |
MLA | Lopez-Ballesteros, Ana,et al."Subterranean ventilation of allochthonous CO2 governs net CO2 exchange in a semiarid Mediterranean grassland".AGRICULTURAL AND FOREST METEOROLOGY 234(2017):115-126. |
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