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.

Phenology and carbon dioxide source/sink strength of a subalpine grassland in response to an exceptionally short snow season

FILIPPA, Gianluca;SINISCALCO, Maria Consolata;
2013

Abstract

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.
8(2)
025008
025008
http://dx.doi.org/10.1088/1748-9326/8/2/025008
M. Galvagno; G. Wohlfahrt; E. Cremonese; M. Rossini; R. Colombo; G. Filippa; T. Julitta; G. Manca; C. Siniscalco; U. Morra di Cella; M. Migliavacca
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/127113
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