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Reference: Wolter, J, Lantuit, H, Fritz, M et al., (2017). Vegetation composition and shrub extent on the Yukon coast, Canada, are strongly linked to ice-wedge polygon degradation. Polar Research, 35 (1), 27489.Citable link to this page:

 

Vegetation composition and shrub extent on the Yukon coast, Canada, are strongly linked to ice-wedge polygon degradation

Abstract: Changing environmental and geomorphological conditions are resulting in vegetation change in ice-wedge polygons in Arctic tundra. However, we do not yet know how microscale vegetation patterns relate to individual environmental and geomorphological parameters. This work aims at examining these relations in polygonal terrain. We analysed composition and cover of vascular plant taxa and surface height, active layer depth, soil temperature, carbon and nitrogen content, pH and electrical conductivity in four polygon mires located on the Yukon coast. We found that vascular plant species composition and cover correlates best with relative surface height. Ridges of low-centred polygons and raised centres of high-centred polygons support the growth of mesic and wetland species (e.g., Betula glandulosa, Salix pulchra, S. reticulata, Rubus chamaemorus, various ericaceous dwarf shrubs, Eriophorum vaginatum, Poa arctica). Wetland and aquatic plant species (e.g., E. angustifolium, Carex aquatilis, C. chordorrhiza, Pedicularis sudetica) grow in low-lying centres of polygons and in troughs between polygons. We also found a relationship between vascular plant species composition and substrate characteristics such as pH, electrical conductivity and total organic carbon, although the individual influence of these parameters could not be determined because of their correlation with relative surface height. Our findings stress the regulatory role of microtopography and substrate in vegetation dynamics of polygonal terrain. Ongoing warming in this region will lead to changes to polygonal terrain through permafrost degradation and subsequent conversion of low-centred into high-centred polygons. Our results indicate that shrubs, particularly Betula glandulosa and heath species, have the potential to expand most.

Publication status:PublishedPeer Review status:Peer reviewedVersion:Publisher's versionDate of acceptance:2016 Funder: Helmholtz Association   Funder: International Bureau ofthe German Federal Ministry of Education and Research   Notes:© 2016 J. Wolter et al. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License.

Bibliographic Details

Publisher: Taylor and Francis

Publisher Website: http://www.tandfonline.com/openaccess

Journal: Polar Researchsee more from them

Publication Website: http://www.tandfonline.com/toc/zpor20/current

Volume: 35

Issue: 1

Extent: 27489

Issue Date: 2017-01-25

pages:27489Identifiers

Doi: https://doi.org/10.3402/polar.v35.27489

Issn: 0800-0395

Eissn: 1751-8369

Uuid: uuid:8b6d0151-e8d7-4fec-89a4-21b208fcb837

Urn: uri:8b6d0151-e8d7-4fec-89a4-21b208fcb837

Pubs-id: pubs:679944 Item Description

Type: journal-article;

Version: Publisher's versionKeywords: Ice-wedge polygon mires western Canadian Arctic modern vegetation microtopography permafrost

Relationships





Autor: Wolter, J - - - Lantuit, H - - - Fritz, M - - - Macias-Fauria, M - institutionUniversity of Oxford Oxford, SSD, SOGE, Geography -

Fuente: https://ora.ox.ac.uk/objects/uuid:8b6d0151-e8d7-4fec-89a4-21b208fcb837



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