DOI: 10.1002/2013GL058182
论文题名: Trade-offs between global warming and day length on the start of the carbon uptake period in seasonally cold ecosystems
作者: Wohlfahrt G. ; Cremonese E. ; Hammerle A. ; Hörtnagl L. ; Galvagno M. ; Gianelle D. ; Marcolla B. ; Di Cella U.M.
刊名: Geophysical Research Letters
ISSN: 0094-8313
EISSN: 1944-8044
出版年: 2013
卷: 40, 期: 23 起始页码: 6136
结束页码: 6142
语种: 英语
英文关键词: carbon gain
; grassland
; net ecosystem exchange
; photosynthesis
; respiration
; snowmelt
Scopus关键词: Ecosystem carbons
; Elevational gradients
; Empirical model
; grassland
; Incident radiation
; Net ecosystem exchange
; respiration
; Snowmelt
; Carbon
; Carbon dioxide
; Global warming
; Photosynthesis
; Snow melting systems
; Ecosystems
; biological uptake
; calibration
; carbon
; carbon dioxide
; global warming
; grassland
; growing season
; net ecosystem exchange
; numerical model
; photosynthesis
; radiation balance
; respiration
; snowmelt
; trade-off
; Alps
英文摘要: It is well established that warming leads to longer growing seasons in seasonally cold ecosystems. Whether this goes along with an increase in the net ecosystem carbon dioxide (CO2) uptake is much more controversial. We studied the effects of warming on the start of the carbon uptake period (CUP) of three mountain grasslands situated along an elevational gradient in the Alps. To this end, we used a simple empirical model of the net ecosystem CO 2 exchange, calibrated, and forced with multiyear empirical data from each site. We show that reductions in the quantity and duration of daylight associated with earlier snowmelts were responsible for diminishing returns, in terms of carbon gain, from longer growing seasons caused by reductions in daytime photosynthetic uptake and increases in nighttime losses of CO 2. This effect was less pronounced at high, compared to low, elevations, where the start of the CUP occurred closer to the summer solstice when changes in day length and incident radiation are minimal. Key Points Effects of warming on the start of the carbon uptake period were simulated Warming induced earlier snowmelt reduced the quantity and duration of daylight Earlier snowmelts reduced daytime sink and increased nighttime source of carbon ©2013 The Authors. Geophysical Research Letters published by Wiley on behalf of the American Geophysical Union. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84891613245&doi=10.1002%2f2013GL058182&partnerID=40&md5=3dc2688a7834f71fcc688ced7d383efd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5577
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Ecology, University of Innsbruck, 6020 Innsbruck, Austria
Recommended Citation:
Wohlfahrt G.,Cremonese E.,Hammerle A.,et al. Trade-offs between global warming and day length on the start of the carbon uptake period in seasonally cold ecosystems[J]. Geophysical Research Letters,2013-01-01,40(23).