DOI: 10.1007/s10533-017-0303-3
Scopus记录号: 2-s2.0-85014116858
论文题名: Decrease in heathland soil labile organic carbon under future atmospheric and climatic conditions
作者: Thaysen E.M. ; Reinsch S. ; Larsen K.S. ; Ambus P.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 133, 期: 1 起始页码: 17
结束页码: 36
语种: 英语
英文关键词: 13C
; 15N
; C cycling
; C storage
; CLIMAITE
; Climate change
; Density fractionation
; FACE
; N cycling
; SOM
Scopus关键词: carbon cycle
; climate change
; climate conditions
; climate modeling
; concentration (composition)
; future prospect
; grass
; heathland
; nitrogen cycle
; organic carbon
; organic matter
; residence time
; shrubland
; soil carbon
; soil depth
; Denmark
; Deschampsia flexuosa
英文摘要: Characterization of the impacts of climate change on terrestrial carbon (C) cycling is important due to possible feedback mechanisms to atmospheric CO2 concentrations. We investigated soil organic matter (SOM) dynamics in the A1 and A2 horizons (~0–5.1 and ~5.1–12.3 cm depth, respectively) of a shrubland grass (Deschampsia flexuosa) after 8 years of exposure to: elevated CO2 (CO2), summer drought (D), warming (T) and all combinations hereof, with TDCO2 simulating environmental conditions for Denmark in 2075. The mean C residence time was highest in the heavy fraction (HF), followed by the occluded light fraction and the free light fraction (fLF), and it increased with soil depth, suggesting that C was stabilized on minerals at depth. A2 horizon SOM was susceptible to climate change whereas A1 horizon SOM was largely unaffected. The A2 horizon fLF and HF organic C stocks decreased by 43 and 23% in response to warming, respectively. Organic nitrogen (N) stocks of the A2 horizon fLF and HF decreased by 50 and 17%, respectively. Drought decreased the A2 horizon fLF N stock by 38%. Elevated CO2 decreased the A2 horizon fLF C stock by 39% and the fLF N stock by 50%. Under TDCO2, A2 horizon fLF C and N stocks decreased by 22 and 40%, respectively. Overall, our results indicate that shrubland SOM will be susceptible to increased turnover and associated net C and N losses in the future. © 2017, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83295
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: Institute of Environmental Assessment and Water Research (IDAEA), CSIC, Jordi Girona 18-26, Barcelona, Catalonia, Spain; Hydrogeology Group (UPC-CSIC), Barcelona, Catalonia, Spain; Centre for Ecology & Hydrology, Environment Centre Wales, Deiniol Rd, Bangor, Gwynedd, United Kingdom; Department of Geosciences and Natural Resource Management, University of Copenhagen, Rolighedsvej 23, Copenhagen, Denmark; Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, Copenhagen, Denmark
Recommended Citation:
Thaysen E.M.,Reinsch S.,Larsen K.S.,et al. Decrease in heathland soil labile organic carbon under future atmospheric and climatic conditions[J]. Biogeochemistry,2017-01-01,133(1)