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- Impact of climate change on radial growth of Siberian spruce and Scots pine in North-western Russia

Tab. 1 - Climatic characteristics in different taiga sub zones in Komi ([10]).

Sub zone of taiga boreal forest	Vegetation period, days	Precipitation, mm	Annual evapotranspiration, mm
May - October	October - April
Northern forest - tundra transition zone	117	235	190	125
Northern taiga	143	290	190	175
Middle taiga	158	330	260	200-250
South taiga	177	370	250	300

Tab. 2 - Tree ring data collected in Komi Republic in 2003-2005. (§) The Scots pine trees not found in forest-tundra transition zone.

Site	Forest zone	Location coordinates	Siberian spruce	Scots pine	Distance to meteo- station, km	Meteo-station, analysed period
n trees	Time Span	Min-Max Mean	n trees	Time Span	Min-Max Mean
1	Forest - tundra transition zone(§)	66°41’260” N 56°49’142” E	16	1812 2005	71-192 115.6	-	-	-	125	Khoseda - Khard, 1933-1995
2	Northern taiga zone	65°59’697” N 57°48’820” E	16	1878 2005	37-126 75.3	20	1924 2005	52-80 69.3	42	Ust-Usa, 1936-2003
3	Middle taiga zone (west)	61°44’834” N 50°34’910” E	40	1779 2005	38-225 104.3	45	1786 2005	34-218 93.6	30	Syktyvkar, 1896-2004
4	Middle taiga zone (east)	63°25’294” N 57°57’597” E	51	1826 2005	27-176 91.3	21	1842 2005	142-163 152	130	Troitsko-Pechersk, 1893-2004
5	South taiga zone	60°33’615” N 49°26’945” E	30	1917 2005	18-89 52.8	22	1877 2005	28-127 73	38	Objachevo, 1944-2004
Total:	153	-	-	108	-	-	Mean 73	-

Tab. 3 - Expressed population signal of chronologies for the period 1954 - 2003.

Site	Forest zone	Siberian spruce	Scots pine
1	Forest - tundra transition zone	0.41	-
2	Northern limit of the Northern taiga zone	0.63	0.71
3	Middle taiga zone (east)	0.85	0.85
4	Middle taiga zone (west)	0.86	0.85
5	South taiga zone	0.85	0.61

Tab. 4 - Amount of variance (R2) explained by temperature (T) and precipitations (P) for the period 1954-2003.

Site	Forest zone	Siberian spruce	Scots pine
P	T	P and T	P	T	P and T
3	Middle taiga zone (east)	0.416	0.390	0.641	0.446	0.484	0.646
4	Middle taiga zone (west)	0.402	0.413	0.652	0.220	0.386	0.702
5	South taiga zone	0.220	0.264	0.435	-	-	-

Tab. 5 - Temporal stability of the amount of variance (R2) explained by temperature and precipitations for 2 subsequent 25-years periods.

Forest zone	Time span	Siberian spruce	Scots pine
Middle taiga zone (east)	1954-1978	0.649	0.574
1979-2003	0.727	0.388
Middle taiga zone (west)	1954-1978	0.309	0.228
1979-2003	0.292	0.370
South taiga zone	1954-1978	0.639	-
1979-2003	0.420	-

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