[en] Are pollen records form small sites appropriate for REVEALS model-based quantitative reconstructions of past regional vegetation ? An empirical test in southern Sweden
Type de document
Auteur(s)
Instance
UNIV-TLSE2
Est une partie de
Mots clés en
Humanities and Social Sciences/Geography
REVEALS model
pollen data
vegetation cover
empirical test
Holocene
Southern Sweden
Mots clés fr
Date de publication
Langue du document
Anglais
Editeur
Springer Verlag
Résumé
[en] In this paper we test the performance of the Regional Estimates of VEgetation Abundance from Large Sites (REVEALS) model using pollen records from multiple small sites. We use Holocene pollen records from large and small sites in southern Sweden to identify what is/are the most significant variable(s) affecting the REVEALS-based reconstructions, i.e. type of site (lakes and/or bogs), number of sites, site size, site location in relation to vegetation zones, and/or distance between small sites and large sites. To achieve this objective we grouped the small sites accordingto (i) the two major modern vegetation zones of the study region, and (ii) the distance between the small sites and large lakes, i.e. small sites within 50, 100, 150, or 200 km of the large lakes. The REVEALS-based reconstructions were performed using 24 pollen taxa. Redundancy analysis was performed on the results from all REVEALS-model runs using the groups within (i) and (ii) separately, and on the results from all runs using the groups within (ii) together. The explanatory power and significance of the variables were identified using forward selection and Monte Carlo permutation tests. The results show that (a) although theREVEALS model was designed for pollen data from large lakes, it also performs well with pollen data from multiple small sites in reconstructing the percentage cover of groups of plant taxa (e.g. open land taxa, summer-green trees, evergreen trees) or individual plant taxa; however, in the case of this study area, the reconstruction of the percentage cover of Calluna vulgaris,Cyperaceae, and Betula may be problematic when using small bogs; (b) standard errors of multiple small-site REVEALS estimates will generally be larger than those obtained using pollen records from large lakes, and they will decrease with increasing size of pollen counts and increasingnumber of small sites; (c) small lakes are better to use than small bogs if the total number of small sites is low; and (d) the size of small sites and the distance between them do not play a major role, but the distance between the small sites and landscape/vegetation boundaries is a determinant factor for the accuracy of the vegetation reconstructions
Nom de la revue
Vegetation History and Archaeobotany
Collection
Source
HAL
Type de ressource
Texte intégral
Est une version de
Licence
Distributed under a Creative Commons Attribution 4.0 International License
Citation bibliographique
Anna-Kari Trondman, Marie-José Gaillard, Shinya Sugita, L. Bjorkman, Annica Greisman, et al.. Are pollen records form small sites appropriate for REVEALS model-based quantitative reconstructions of past regional vegetation ? An empirical test in southern Sweden. Vegetation History and Archaeobotany, 2016, 25, pp.131-151. [hal-01447623]
Citer cette ressource
[en] Are pollen records form small sites appropriate for REVEALS model-based quantitative reconstructions of past regional vegetation ? An empirical test in southern Sweden,
dans Études nordiques,
consulté le 19 Avril 2025, https://etudes-nordiques.cnrs.fr/s/numenord/item/17984