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Since the impact of temperature on seedling growth and biomass allocation of different tree species remains relatively unknown, the influence of different temperature conditions on stem diameter (xylem and bark), stem and root extensions, as well as below- and aboveground woody biomass, in three-year old European beech (Fagus sylvatica L. ) and Scots pine (Pinus sylvestris L. ) seedlings in 2010–2011 were studied. One-year-old seedlings were grown outdoors (mean temperature during the growing season = 17–19°C), in the greenhouse (mean temperature during the growing season = 22–24°C) and climatized room (mean temperature during the growing season = 15–17°C) for two years. In terms of radial increment, xylem increments were narrowest in the case of increased temperature for beech and decreased temperature for pine. There was no difference in the thickness of the bark in beech seedlings exposed to different temperature conditions whereas in pine, the bark proportion was highest in control seedlings with the widest diameters. The periderm thickness was comparable in seedlings exposed to different temperatures and represented 10–14 % and 15 % of the bark tissue in pine and beech, respectively. Comparison of the total radial increments of seedlings of the two species under different temperature conditions showed that they were wider in pine in all three regimes. Increment of the main root was considerably higher in both species and represented about 90 % of the total length increment in beech and 74–87 % in pine. In addition, woody biomass was substantially higher aboveground in both tree species (by about 70–80 %). With beech, above- and belowground biomass was reduced in the case of elevated temperature, with the smallest share of roots. In pine, lower temperature diminished amount of biomass and caused its greatest allocation to belowground, which represented almost half of the total biomass accumulation. The short-term treatments clearly show that biomass allocation shifts of pine and beech in response to temperature seem to be a species-specific. The observed differences could be viewed as a plastic adjustment to environmental heterogeneity.  Key words: European beech, Scots pine, radial increment, stem, root, bark, xylem Izvlecek Malo je znanega o vplivu temperature na rast sadik in alokacijo biomase pri razlicnih drevesnih vrstah, zato smo raziskali vpliv razlicnih temperaturnih razmer na debelinsko rast debla (tj. les in skorja), vrsno rast debla in korenin ter na podzemno in nadzemno lesno biomaso pri triletnih sadikah navadne bukve ( Fagus sylvatica L.) in rdecega bora ( Pinus sylvestris L.) v obdobju 2010–2011. V ta namen so bile enoletne sadike dve leti izpostavljene trem razlicnim temperaturnim režimom: na prostem (povprecna temperatura v casu rastne sezone = 17–19°C), v rastlinjaku (povprecna temperatura v casu rastne sezone = 22–24°C) in v hladilni komori (povprecna temperatura v casu rastne sezone = 15– 17°C). Lesni prirastki so bili najmanjsi v primeru povisane temperature pri bukvi, pri boru pa pri zmanjsani temperaturi. Pri sadikah bukve izpostavljenih razlicnim temperaturnim razmeram ni bilo razlik v sirini skorje, medtem ko je bil delež skorje pri boru najvecji pri kontrolnih sadikah, ki so imele tudi najsirse premere. Debelina periderma je bila primerljiva pri sadikah izpostavljenih razlicnim temperaturam in je predstavljala 10–14 % tkiva skorje pri bukvi in 15 % tkiva pri boru. Debelinski prirastki so bili v vseh režimih sirsi pri boru kot pri bukvi. Prirastek glavne korenine je bil znatno vecji kot prirastek debla pri obeh vrstah in je predstavljal približno 90 % celotne vrsne rasti pri bukvi in 74–87 % pri boru. Nadzemna lesna biomasa je bila pri obeh drevesnih vrstah bistveno vecja (za približno 70–80 %) v primerjavi s podzemno biomaso. Pri bukvi je bila celotna biomasa zmanjsana pri povisani temperaturi z najmanjsim deležem korenin. Pri boru je bila najmanjsa kolicina biomase pri znižani temperaturi, ko smo zabeležili najvecjo prerazporeditev biomase v podzemne dele, ki so predstavljali skoraj polovico celotne lesne biomase. Kratkorocni poskusi kažejo, da okoljske razmere za optimalno rast proucevanih drevesnih vrst niso primerljive, kar se odraža v razlicnih pr erazporeditvah biomase pri boru in bukvi pri razlicnih temperaturnih režimih.  Kljucne besede: navadna bukev, rdeci bor, debelinski prirastek, deblo, korenina, skorja, les

folia biologica et geologica

Biomass allocation shifts of Fagus sylvatica L. and Pinus sylvestris L. seedlings in response to temperature / Prerazporeditev biomase pri sadikah Fagus sylvatica L. in Pinus sylvestris L. kot odziv na temperaturo