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Climate–growth associations of white spruce provenances. Correlation analyses of basal area increment residual chronologies against the monthly mean soil moisture index (SMI) from May to October of the previous (t − 1) growing season and the current growing season (t) are presented for the period 1989–2007. The scale bar reports positive (red) and negative (blue) correlation coefficients. Significant relationships (P < 0.05) are indicated by dots in the correlation matrix.
