Journal Title
Title of Journal: Plant Ecol
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Abbravation: Plant Ecology
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Publisher
Springer Netherlands
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Authors: Juha M Metsaranta Victor J Lieffers
Publish Date: 2008/04/01
Volume: 199, Issue: 1, Pages: 137-152
Abstract
We used treering reconstruction data to study changes in the spatial pattern of live and dead trees at an annual resolution over a 50year period at four unmanaged evenaged fire origin jack pine Pinus banksiana Lamb stands in Saskatchewan and Manitoba Canada Previous studies of the spatial pattern in P banksiana have either looked at only a snapshot from a survey done at a single point in time or repeated measurements of permanent plots taken at 10year intervals With annual data we could examine detailed changes in spatial patterns and relate these to events during stand development and external disturbances Trees were initially clustered at all sites but at different distances at each site most likely because of variability in seedbed distribution at stand initiation Clustering disappeared over time at all sites and at a similar mean tree spacing at each site However significant regularity only appeared sporadically at one site indicating that competition with neighbours was not the only factor influencing changes in spatial pattern At two of the four sites clustering disappeared suddenly at the same time that mortality rate reached a peak in one case also coinciding with a jack pine budworm Choristoneura pinus pinus Freeman defoliation event Dead trees were also initially more clustered than the distribution of all trees but at different distances than the clustering of live trees This also disappeared over time so that dead trees were eventually a random sample from the distribution of all trees After the peak of mortality had passed factors other than competition were determining the dynamics of these forestsWe thank Derek Bakker Jennifer Hofman Michael Laczek and Theresa Mundell for assistance in the field Field work was supported by CircumpolarBoreal Alberta and Natural Science and Engineering Research Council of Canada research grants JMM was supported by a Natural Science and Engineering Research Council of Canada scholarship a Province of Alberta Graduate Fellowship a Desmond Crossley Memorial Scholarship and a Prairie Adaptation Research Collaborative graduate scholarship We thank Annett Wolf for her feedback on an earlier version of this manuscript An anonymous reviewer also provided comments
Keywords:
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