Variability of photosynthetic capacity and water relations of Pinus sylvestris L. in the field
Luettge, U.,Darmstadt Univ. of Technology (Germany). Inst. of Botany | Escher, P.,University of Freiburg (Germany). Inst. of Forest Botany and Tree Physiology | Paluch, R.,Forest Research Inst., Bialowieza (Poland). Dept. of Natural Forest | Pfanz, H.,University of Duisburg-Essen (Germany). Inst. of Applied Botany | Wittmann, C.,University of Duisburg-Essen (Germany). Inst. of Applied Botany | Rennenberg, H.,University of Freiburg (Germany). Inst. of Forest Botany and Tree Physiology | Rakowski, K.,Forest Research Inst. Raszyn (Poland)
Measurements of dependence of photosynthetic electron transport on irradiance and analyses of stable isotope ratios (delta18O, delta13C, delta15N) were performed on 4 to 6-year-old pine trees in the primeval forest reserve of Bialowieza and on 21-year-old pine trees of a plantation of different provenances at the Sekocin Forest Station near Warsaw, Poland. Small differences in maximum photosynthetic electron transport rates, ETRmax were related to growth. Stable isotope analyses suggest that water relations play an important role for the performance of P. sylvestris at the sites studied. The intraspecific comparisons showed a very high variability of photosynthetic capacity between needles of given trees and between individual trees under similar conditions. Differences between specific provenances were also observed. This is relevant for ecological niche occupation in a wide geographical growth range, where P. sylvestris is actually occurring. The high physiological plasticity demonstrated reveals a conspicuous trait of this tree species.
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