Effects of climate variables on intra-annual stem radial increment in Pinus cembra (L.) along the alpine treeline ecotone

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Table II

Characteristics of Pinus cembra trees selected for dendrometer measurements (n = 3 trees/site) and sampling micro-cores (n = 5 trees/site) throughout the treeline ecotone. Mean values ± standard deviation are given for age and ring width (RW).

				Dendrometer			Micro-coring

Site	Altitude	Tree height	Crown	Stem	Age³	RW (mm)		Age³ (y)	RW (mm)
	(m a.s.l.)	(m)	diameter¹ (m)	diameter² (cm)	(y)			(y)

						2004–2006	2007		2004–2006	2007
Timberline	1950	10–14	4–5	30–50	60 ± 7	2.34 ± 0.69	2.39 ± 0.42	80 ± 11	1.98 ± 0.65	1.84 ± 0.72
Treeline	2110	3–5	2.5–3.0	15–20	49 ± 6	2.65 ± 0.83	3.14 ± 1.11	70 ± 15	2.20 ± 0.74	2.07 ± 0.92
Krummholz	2180	0.5–1.0	0.35–0.60	5–7	16 ± 2	1.44 ± 0.44	1.49 ± 0.55	22 ± 5	2.00 ± 0.77	2.17 ± 0.63

Range of maximum crown diameter.

Range of tree diameter measured at sampling height (see Material and Methods).

Approximate age of selected trees was calculated by adding 15, 10 and 5 y to mean number of measured tree rings of increment cores taken at c. 1.3 m (timberline), c. 50 cm (treeline) and c. 15 cm stem height (krummholz-site), respectively.