Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/2013JG002495 |
Nocturnal soil CO2 uptake and its relationship to subsurface soil and ecosystem carbon fluxes in a Chihuahuan Desert shrubland | |
Hamerlynck, Erik P.1; Scott, Russell L.1; Sanchez-Canete, Enrique P.2,3; Barron-Gafford, Greg A.4 | |
通讯作者 | Hamerlynck, Erik P. |
来源期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES |
EISSN | 2169-8961 |
出版年 | 2013 |
卷号 | 118期号:4页码:1593-1603 |
英文摘要 | Despite their prevalence, little attention has been given to quantifying arid land soil and ecosystem carbon fluxes over prolonged, annually occurring dry periods. We measured soil [CO2] profiles and fluxes (F-s) along with volumetric soil moisture and temperature in bare interplant canopy soils and in soils under plant canopies over a three-month hot and dry period in a Chihuahuan Desert shrubland. Nocturnal F-s was frequently negative (from the atmosphere into the soil), a form of inorganic carbon exchange infrequently observed in other deserts. Negative F-s depended on air-soil temperature gradients and were more frequent and stronger in intercanopy soils. Daily integrated ecosystem-level F-s was always positive despite lower daily F-s in intercanopy soils due to nocturnal uptake and more limited positive response to isolated rains. Subsurface [CO2] profiles associated with negative F-s indicated that sustained carbonate dissolution lowered shallow-soil [CO2] below atmospheric levels. In the morning, positive surface F-s started earlier and increased faster than shallow-soil F-s, which was bidirectional, with upward flux toward the surface and downward flux into deeper soils. These dynamics are consistent with carbonate precipitation in conjunction with convection-assisted CO2 outgassing from warming air and soil temperatures and produced a pronounced diurnal F-s temperature hysteresis. We concluded that abiotic nocturnal soil CO2 uptake, through a small carbon sink, modulates dry season ecosystem-level carbon dynamics. Moreover, these abiotic carbon dynamics may be affected by future higher atmospheric carbon dioxide levels and predictions of more prolonged and regular hot and dry periods. |
英文关键词 | carbonate dynamics climate desert soils drought soil respiration |
类型 | Article |
语种 | 英语 |
国家 | USA ; Spain |
收录类别 | SCI-E |
WOS记录号 | WOS:000329871400021 |
WOS关键词 | STABLE ISOTOPIC COMPOSITION ; SPATIAL-PATTERNS ; PLANT MORTALITY ; WATER ; GRASSLAND ; RESPIRATION ; TEMPERATURE ; CLIMATE ; PULSES ; ENCROACHMENT |
WOS类目 | Environmental Sciences ; Geosciences, Multidisciplinary |
WOS研究方向 | Environmental Sciences & Ecology ; Geology |
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/2XILL650/178430 |
作者单位 | 1.ARS, USDA, Southwest Watershed Res Ctr, Tucson, AZ 85719 USA; 2.CSIC, Estn Expt Zonas Aridas, Almeria, Spain; 3.Ctr Andaluz Medio Ambiente, Granada, Spain; 4.Univ Arizona, Sch Geog & Dev & Earthsci B2, Tucson, AZ USA |
推荐引用方式 GB/T 7714 | Hamerlynck, Erik P.,Scott, Russell L.,Sanchez-Canete, Enrique P.,et al. Nocturnal soil CO2 uptake and its relationship to subsurface soil and ecosystem carbon fluxes in a Chihuahuan Desert shrubland[J]. University of Arizona,2013,118(4):1593-1603. |
APA | Hamerlynck, Erik P.,Scott, Russell L.,Sanchez-Canete, Enrique P.,&Barron-Gafford, Greg A..(2013).Nocturnal soil CO2 uptake and its relationship to subsurface soil and ecosystem carbon fluxes in a Chihuahuan Desert shrubland.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,118(4),1593-1603. |
MLA | Hamerlynck, Erik P.,et al."Nocturnal soil CO2 uptake and its relationship to subsurface soil and ecosystem carbon fluxes in a Chihuahuan Desert shrubland".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 118.4(2013):1593-1603. |
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