DOI: 10.1007/s10533-015-0097-0
Scopus记录号: 2-s2.0-84930664674
论文题名: Contribution of carbonate weathering to the CO<inf>2</inf> efflux from temperate forest soils
作者: Schindlbacher A. ; Borken W. ; Djukic I. ; Brandstätter C. ; Spötl C. ; Wanek W.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 124, 期: 2018-01-03 起始页码: 273
结束页码: 290
语种: 英语
英文关键词: 13C
; Carbonate weathering
; Soil respiration
; Temperate forest
Scopus关键词: carbon dioxide
; carbon isotope
; carbonate
; chemical weathering
; dissolved inorganic carbon
; forest soil
; isotopic analysis
; soil carbon
; soil horizon
; soil moisture
; soil respiration
; temperate forest
英文摘要: Temperate forests provide favorable conditions for carbonate bedrock weathering as the soil CO2 partial pressure is high and soil water is regularly available. As a result of weathering, abiotic CO2 can be released and contribute to the soil CO2 efflux. We used the distinct isotopic signature of the abiotic CO2 to estimate its contribution to the total soil CO2 efflux. Soil cores were sampled from forests on dolomite and limestone and were incubated under the exclusion of atmospheric CO2 . Efflux and isotopic signatures of CO2 were repeatedly measured of cores containing the whole mineral soil and bedrock material (heterotrophic respiration + CO2 from weathering) and of cores containing only the mineral top-soil layer (A-horizon; heterotrophic respiration). An aliquot of the cores were let dry out during incubation to assess effects of soil moisture. Although the δ13C values of the CO2 efflux from the dolomite soil cores were within a narrow range (A-horizon −26.2 ± 0.1 ‰; whole soil profile wet −25.8 ± 0.1 ‰; whole soil profile dry −25.5 ± 0.1 ‰) the CO2 efflux from the separated A-horizons was significantly depleted in 13C when compared to the whole soil profiles (p = 0.015). The abiotic contribution to the total CO2 efflux from the dolomite soil cores was 2.0 ± 0.5 % under wet and 3.4 ± 0.5 % under dry conditions. No abiotic CO2 efflux was traceable from the limestone soil cores. An overall low contribution of CO2 from weathering was affirmed by the amount and 13C signature of the leached dissolved inorganic carbon (DIC) and the radiocarbon signature of the soil CO2 efflux in the field. Together, our data point towards no more than 1–2 % contribution of abiotic CO2 to the growing season soil CO2 efflux in the field. © 2015, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83511
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 of Forest Ecology, Federal Research and Training Centre for Forests, Natural Hazards and Landscape – BFW, Seckendorff-GudentWeg 8, Vienna, Austria; Department of Soil Ecology, University of Bayreuth, Bayreuth, Germany; Institute of Geology, University of Innsbruck, Innsbruck, Austria; Department of Microbiology and Ecosystem Science, University of Vienna, Vienna, Austria
Recommended Citation:
Schindlbacher A.,Borken W.,Djukic I.,et al. Contribution of carbonate weathering to the CO<inf>2</inf> efflux from temperate forest soils[J]. Biogeochemistry,2015-01-01,124(2018-01-03)