Response of Tree-Ring Density to Climate in Maine, USA
- Conkey, Laura E.
Laboratory of Tree-Ring Research, The University of Arizona
Cored of red spruce from three upper-elevation site in Maine, USA were X-rayed, and minimum and maximum wood densities as well as ring widths were mechanically recorded. The 200 to 300 year series of maximum densities at the three sites show remarkable inter-site similarity. Maximum density and total ring-width series from one site, Elephant Mt. were standardized. Response functions, which measure tree-growth response to climatic variables, were calculated for each of these two series. The ring-width response function explained 66% total variance, of which 34% was explained by climate. The maximum density response function explained 70% of total variance, 67% of which was explained by the same climatic variables. Thus, the climate signal from maximum densities is stronger, and perhaps more season-specific, than that of ring widths.
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