transparent gif


Ej inloggad.

Göteborgs universitets publikationer

Snow distribution and biocomplexity in alpine landscapes: a progress report

Författare och institution:
Robert G. Björk (Botaniska institutionen, systematisk botanik); Ulf Molau (Botaniska institutionen, systematisk botanik)
Publicerad i:
ESF – SEDIFLUX Network, Second Workshop, Clermont-Ferrand, France, 20 – 22 January 2005,
Konferensbidrag, poster
Sammanfattning (abstract):
Snowbed ecosystems make up a pronounced component throughout the tundra biome, particularly in alpine areas due to the ragged topography and wind re-distribution of snow. As there are species and communities restricted to the snowbed habitat, they make a unique com-ponent in the alpine biodiversity at scales from species to landscapes. In connection with the Global Warming forecast, snowbed ecosystems of alpine Europe are regarded as particularly vulnerable in IPCC's 2001 assessment report. Snowbeds also provide important ecosystem services to the landscape such as maintaining the adjacent earlier-thawing ecosystems by steady water and nutrient supply, and by ensuring good winter conditions for lemmings. During years of low density the lemming preferentially grazes in snowbeds. Furthermore, snowbeds is the plant community of utmost importance for reindeers, and the availability of snowbeds in the landscape can influence the well-being of reindeers by having the possibility to offer nutrient rich food late in the growing season when the food supply have started to run short. The winter weather conditions are those that are primarily responsible for the variability in the snowbed morphology, while the local topography sets the general snowbed pattern. However, the summer weather conditions are also implicated in the variation of rate and pattern of snowmelt between years, though the general snowbed outline remains consistent among years. As tundra ecosystems are typically limited by nitrogen availability as well as temperature, Climate Change and a likely exponentially increasing deposition of plant-available nitrogen with the precipitation are inevitably accelerating processes that will alter the structure and extent of this key ecosystem. The project “Snow Distribution and Biocomplexity in Alpine Landscapes” is running at Latnjajaure Field Station, in northern Swedish Lapland, where four snowbed plant communi-ties are studied. The snowbeds are of the “moderate type”, which means that they are melting out before the end of July, and they are situated in both heath and meadow sites. Our current studies include, e.g., monitoring of snow dynamics, plant community structure in fertilized and control plots, lemming population dynamics, nitrogen and debris deposition, and soil processes. We will report on the progress of this ongoing project.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Biologiska vetenskaper ->
Ekologi ->
Terrestrisk ekologi
Arctic, Biocomplexity, Climate Change, Snow
Postens nummer:
Posten skapad:
2010-02-16 07:07

Visa i Endnote-format

Göteborgs universitet • Tel. 031-786 0000
© Göteborgs universitet 2007