Summer temperature affects the ratio of radial and height growthof Scots pine in northern Finland

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Table VII

The highest correlation coefficient between residual chronology and the mean temperature of current (radial growth) or previous growing season (height growth) for years 1961–2003/2004. The start and end of the temperature period that yields the highest correlation coefficient is defined as months (MM), days (DD), or relative growing-degree-days (GDD%) and selected using a direct-search optimization.

		150-year-old stand		50-year-old stand

		Radial growth	Height growth	Radial growth	Height growth
		(std.err. 0.11)	std.err. 0.11)	(std.err. 0.09)	(std.err. 0.09)
MM	Corr. coeff.	0.44	0.30	0.55	0.77
	Month	July	July	July	July

DD	Corr. coeff.	0.50	0.45	0.61	0.85
	From date	28th June	9th July	27th June	25th June
	To date	23th July	25th July	26th July	12th Aug
	Period length, days	26	16	30	48

GDD%	Corr. coeff.	0.56	0.44	0.61	0.86
	From GDD%	28	38	38	35
	To GDD%	58	52	53	77
	Period length, GDD%	30	14	14	42
	From average date	26th June	5th July	5th July	2th July
	To average date	20th July	16th July	16th July	5th Aug
	Average period length, days (std.dev.)	25 (6.8)	12 (3.7)	12 (3.6)	35 (11.4)