Dendroclimatic response of Picea mariana and Pinus banksiana along alatitudinal gradient in the eastern Canadian boreal forest
In: Canadian Journal of Forest Research, Jg. 29 (1999-09-01), Heft 9, S. 1333
academicJournal
Zugriff:
To decipher spatial and temporal tree-growth responses to climate change we used tree-ring data from Picea mariana (Mill.) BSP and Pinus banksiana Lamb. along a latitudinal transect in western Quebec. The transect encompassed the distinct transition between mixed and coniferous forests at approximately 49 deg. N. Correlation analyses and principal component analyses were used to identify common spatiotemporal growth patterns, and site- and species-specific patterns since 1825. A moist summer in the year t - 1 and an early start of the current growing season favored growth of both species. A prolongation of the growing season into fall was the most distinguishing factor between thespecies. A long and gradual climatic gradient shifted to a short gradient with a clear segregation between the southern and northern parts of the transect. This shift, around 1875, was abrupt and characterized by a turbulent climatic period. The observed pattern was likely related to a large-scale shift in the mean position of the Arctic Front that occurred at the end of the 1800s. No discrete climatic settingexplained the present switch from mixedwoods to conifers at 49 deg. N. Awareness of such nonequilibrial relations between climate and species distribution is essential when assessing vegetation responses tofuture climate change. [ABSTRACT FROM AUTHOR]
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Dendroclimatic response of Picea mariana and Pinus banksiana along alatitudinal gradient in the eastern Canadian boreal forest
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Autor/in / Beteiligte Person: | Tardif, Jacques ; Bergeron, Yves ; Hofgaard, Annika |
Zeitschrift: | Canadian Journal of Forest Research, Jg. 29 (1999-09-01), Heft 9, S. 1333 |
Veröffentlichung: | 1999 |
Medientyp: | academicJournal |
ISSN: | 0045-5067 (print) |
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