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Changes in climate-growth relationships for Picea glauca in the Yukon Territory, Canada
Presented by Mr. David S. MORIMOTO on 15 May 2013 from 18:00 to 21:00
Type: Poster Presentation
Session: Poster Session + Reception
Board #: 47
A network of 73 upper elevation white spruce chronologies was developed from treeline sites across the Yukon Territory. PCA of standard ring-width chronologies indicate a strong common growth pattern (50 sites, 57.3% of variance) loading on PC1 during the 1900-1950 period but varied patterns over the 1951-2000 interval when 22, 19 and 14 chronologies load on the first 3 PCs respectively (67.8% cumulative variance). The PC1 chronologies of the 1900-1950 period show strong positive relationships to summer (JJA) minimum temperatures and strong negative relationships with summer maximum temperatures of the previous year. Sixteen of these 50 chronologies show strong negative responses to minimum temperatures of spring and summer (MAMJJA) in the 1951-2000 interval and only 4 retain the strong positive summer signal. The greatest changes and most negative response to summer temperatures occur in the central and north central Yukon. Positive summer temperature sensitivity only remains in the most southerly sites.