Sub-Alpine Shrubs in North Sweden - Annual Growth Analyses of Juniperus nana, Betula nana, and Salix glaucaEntry ID: shrubo
Abstract: Shrub advance into tundra areas alters albedo and carbon storage and is an important feedback mechanism to global climate change. However, the existence of such vegetative expansion in North-Sweden, its rates, and the precise nature of climate-growth relationships is unknown. Our study in the sub-alpine belt of the Swedish Scandinavian Mountains investigates the three most abundant shrub species ... (Juniperus nana, Betula nana, Salix glauca) above tree-line on two slopes with different exposure (NE/S). Here we present the preliminary results of the dendrochronological analysis of 35 individuals of Juniperus nana concerning the climatic influence on ring widths. Summer temperatures showed highest correlations with ring width, while there is evidence for an influence of winter snow depth. Shrub radial growth has mainly increased since the 1850s, with a small decrease in growth 1940-60. The recent strong increase starting 1956 coincides with rising average and winter temperatures in the area. Our preliminary findings point to a possible shrub expansion for Juniperus nana, warranting further investigation (including other species).
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Data Set Citation
Dataset Originator/Creator: Martin Hallinger
Dataset Title: Subalpine shrubs in Northsweden - annual growth analyses of Juniperus nana, Betula nana and Salix glauca
Start Date: 1800-01-01Stop Date: 2008-01-01
Latitude Resolution: N68 20. -21.
Longitude Resolution: E18 39. -41.
Horizontal Resolution Range: 500 meters - < 1 km
Vertical Resolution Range: 30 meters - < 100 meters
Temporal Resolution: 1800-2008
Temporal Resolution Range: Annual
ISO Topic Category
Quality the data set includes shrub ring data exceeding an EPS-value of 0.83 from 1930 on.
Access Constraints in-house
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Data Set Progress
Fax: +49 3834-86-4096
Email: martinhallinger at gmx.de
Ernst-Moritz-Arndt-Universität Greifswald Institut für Botanik und Landschaftsökologie Grimmer Str. 88
Postal Code: 17487
Hallinger M., Manthey M., Wilmking M. Establishing a missing link: Warm summers and winter snow cover benefit shrub expansion into alpine tundra. submitted (12/09) .
Creation and Review Dates
DIF Creation Date: 2010-01-06
Last DIF Revision Date: 2010-01-13