Nitrogen nutrition of European beech is maintained at sufficientwater supply in mixed beech-fir stands

摘要: Research highlights: Interaction effects of coniferous on deciduous species have been investigated before the background climate change. Background and objectives: The cultivation European beech (Fagus sylvatica L.) in mixed stands has currently received attention, since future performance mid-European forest monocultures a changing is under debate. We water relations nitrogen (N) nutrition with silver-fir (Abies alba Mill.) Black Forest at different environmental conditions, Croatian Velebit southern distribution limit beech, over seasonal course sufficient availability. Material methods: Water were analyzed via δ13C signatures, as integrative measures supply assuming that photosynthesis processes not impaired. N was characterized by partitioning between soluble fractions structural N. Results: In relatively wet year 2016, leaves, fir needles roots differed season, but generally cultivation. At all sites, previous current revealed significantly lower total contents entire season than leaves. Fir fine exhibited higher or similar amounts compared to needles. Correlation analysis strong relationship leaf root signatures soil parameters stands, pure stands. While glutamine (Gln) uptake capacity strongly related monoculture arginine (Arg) capacities Conclusions: Leaf indicated facilitative effect sites where concentrations low, an indication competition it high. This improvement could be partially attributed protein contents, differences individual source. From these results concluded despite trees three field investigated, association mediated interactive association, even supply.