Understorey vegetation change in a Picea mariana chronosequence |
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| Authors: | S. J. Taylor T. J. Carleton R. Adams |
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| Affiliation: | (1) Department of Botany, University of Toronto, M5S 1A1 Toronto, Ontario, Canada;(2) Faculty of Forestry and Department of Botany, University of Toronto, M5S 1A1 Toronto, Ontario, Canada;(3) Faculty of Forestry, University of Toronto, M5S 1A1 Toronto, Ontario, Canada |
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| Abstract: | Eighteen black spruce (Picea mariana) stands, representing postfire ages of 26 to 120 yr, were surveyed for understorey vegetation and site/microsite characteristics at two spatial scales. This enabled comparison of within- versus among-stand compositional variation.Detrended correspondence analysis (DCA) ordination among the 18 stands revealed a complex age/moisture gradient. DCA ordination among 1 800 quadrats within the stands indicated a similar gradient with much compositional overlap. Quadrats were grouped, using two-way indicator species analysis (TWINSPAN), into 9 classes each representing a phase in understorey vegetation composition. These phases shifted in abundance from young to old stands with a high degree of concordance among replicates in the same age class. Understorey succession is strongly linked to the stages in tree growth, mortality and thinning coupled with the accumulation of site moisture.Abbreviations DCA Detrended Corrospondence Analysis |
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| Keywords: | Classification DECORANA Ordination Succession TWINSPAN Understorey |
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