DOI: 10.1007/s10584-014-1247-4
Scopus记录号: 2-s2.0-84939969380
论文题名: Increased photosynthesis compensates for shorter growing season in subarctic tundra—8 years of snow accumulation manipulations
作者: Bosiö J. ; Stiegler C. ; Johansson M. ; Mbufong H.N. ; Christensen T.R.
刊名: Climatic Change
ISSN: 0165-0009
EISSN: 1573-1480
出版年: 2014
卷: 127, 期: 2 起始页码: 321
结束页码: 334
语种: 英语
Scopus关键词: Efficiency
; Permafrost
; Photosynthesis
; Snowfall measurement
; Soil moisture
; Gross primary production
; Light use efficiency
; Northern sweden
; Permafrost thaws
; Photosynthetic active radiations
; Snow accumulation
; Snow thickness
; Vegetation composition
; Snow
英文摘要: This study was initiated to analyze the effect of increased snow cover on plant photosynthesis in subarctic mires underlain by permafrost. Snow fences were used to increase the accumulation of snow on a subarctic permafrost mire in northern Sweden. By measuring reflected photosynthetic active radiation (PAR) the effect of snow thickness and associated delay of the start of the growing season was assessed in terms of absorbed PAR and estimated gross primary production (GPP). Six plots experienced increased snow accumulation and six plots were untreated. Incoming and reflected PAR was logged hourly from August 2010 to October 2013. In 2010 PAR measurements were coupled with flux chamber measurements to assess GPP and light use efficiency of the plots. The increased snow thickness prolonged the duration of the snow cover in spring. The delay of the growing season start in the treated plots was 18 days in 2011, 3 days in 2012 and 22 days in 2013. Results show higher PAR absorption, together with almost 35 % higher light use efficiency, in treated plots compared to untreated plots. Estimations of GPP suggest that the loss in early season photosynthesis, due to the shortening of the growing season in the treatment plots, is well compensated for by the increased absorption of PAR and higher light use efficiency throughout the whole growing seasons. This compensation is likely to be explained by increased soil moisture and nutrients together with a shift in vegetation composition associated with the accelerated permafrost thaw in the treatment plots. © 2014, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/84710
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 Physical Geography and Ecosystem Science, Lund University, Lund, Sweden; Royal Swedish Academy of Sciences, PO Box 50005, Stockholm, Sweden; Department of Bioscience, Aarhus University, Roskilde, Denmark
Recommended Citation:
Bosiö J.,Stiegler C.,Johansson M.,et al. Increased photosynthesis compensates for shorter growing season in subarctic tundra—8 years of snow accumulation manipulations[J]. Climatic Change,2014-01-01,127(2)