期刊
ENVIRONMENTAL RESEARCH LETTERS
卷 8, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1748-9326/8/2/025008
关键词
carbon uptake period; snowmelt; eddy covariance; net ecosystem exchange; extreme events
资金
- PhenoALP project, an Interreg project
- European Regional Development Fund, under the operational program for territorial cooperation Italy-France (ALCOTRA)
Changes in snow cover depth and duration predicted by climate change scenarios are expected to strongly affect high-altitude ecosystem processes. This study investigates the effect of an exceptionally short snow season on the phenology and carbon dioxide source/sink strength of a subalpine grassland. An earlier snowmelt of more than one month caused a considerable advancement (40 days) of the beginning of the carbon uptake period (CUP) and, together with a delayed establishment of the snow season in autumn, contributed to a two-month longer CUP. The combined effect of the shorter snow season and the extended CUP led to an increase of about 100% in annual carbon net uptake. Nevertheless, the unusual environmental conditions imposed by the early snowmelt led to changes in canopy structure and functioning, with a reduction of the carbon sequestration rate during the snow-free period.
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