DOI: 10.1007/s10533-013-9907-4
Scopus记录号: 2-s2.0-84896330374
论文题名: Partitioning the net ecosystem carbon balance of a semiarid steppe into biological and geological components
作者: Rey A. ; Belelli-Marchesini L. ; Etiope G. ; Papale D. ; Canfora E. ; Valentini R. ; Pegoraro E.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 118, 期: 2018-01-03 起始页码: 83
结束页码: 101
语种: 英语
英文关键词: Ecosystem respiration
; Geofluid circulation
; Geological carbon sources
; Gross primary productivity
; NDVI
; NECB partitioning
; Semiarid ecosystems
Scopus关键词: boundary layer
; carbon balance
; carbon dioxide
; carbon emission
; carbon flux
; grass
; NDVI
; net ecosystem exchange
; primary production
; respiration
; semiarid region
; steppe
; terrestrial ecosystem
; wind velocity
英文摘要: Recent studies have highlighted the need to consider geological carbon sources when estimating the net ecosystem carbon balance (NECB) of terrestrial ecosystems located in areas potentially affected by geofluid circulation. We propose a new methodology using physical parameters of the atmospheric boundary layer to quantify the CO2 coming from deep ground origin in a steppe ecosystem located in the SE of Spain. Then, we compared published NECB estimates at the site with seasonal patterns of soil CO2 efflux and biological activity measured by satellite images over a 2-year period (2007/2008). The alpha grass ecosystem was a net carbon source (93.8 and 145.1 g C m-2 year-1, in 2007 and 2008, respectively), particularly as a result of large amounts of carbon released over the dry period that were not related to biological activity. While the highest ecosystem CO2 emission rates were measured over the dry period (reaching up to 15 μmol m-2 s-1), soil CO2 efflux rates (ca. 0.5 μmol m-2 s-1) and plant productivity were minimal during this period. After using a linear relationship between NECB and wind speed for different stability conditions and wind sectors, we estimated the geological flux F GEO (217.9 and 244.0 g C m-2 in 2007 and 2008, respectively) and subtracted it from the NECB to obtain the biological flux F BIO (-124.0 and -98.9 g C m-2 in 2007 and 2008, respectively). We then partitioned F BIO into gross primary productivity and ecosystem respiration and proved that, after removing F GEO, ecosystem respiration and soil CO2 efflux followed similar seasonal patterns. The annual contribution of the geological component to NECB was 49.6 and 46.7 % for the year 2007 and 2008, respectively. Therefore, it is clear that geological carbon sources should be quantified in those ecosystems located in areas with potential natural emission of geological gases to the surface. © 2013 Springer Science+Business Media Dordrecht. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83619
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department Biogeography and Global Change, National Museum of Natural Sciences, Spanish Scientific Council (CSIC), C/Serrano 115, 28006 Madrid, Spain; Department for Innovation in Biological, Agro-food and Forest Systems, DIBAF, University of La Tuscia, Via S. Camillo de Lellis, 01100 Viterbo, Italy; INGV, Istituto Nazionale di Geofisica e Vulcanologia Sezione Roma 2, Via V. Murata, 605, 00143 Rome, Italy; Department of Earth Sciences, Vrije Universiteit, Amsterdam, Netherlands; Babes-Bolyai University, Cluj-Napoca, Romania; Euromediterranean Center for Climate Change (CMCC), Via Augusto Imperatore 16, 73100 Lecce, Italy
Recommended Citation:
Rey A.,Belelli-Marchesini L.,Etiope G.,et al. Partitioning the net ecosystem carbon balance of a semiarid steppe into biological and geological components[J]. Biogeochemistry,2014-01-01,118(2018-01-03)