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Research on drought impact on tree functioning is focussed primarily on water and carbon (C) dynamics. Changes in nutrient uptake might also affect tree performance under drought and there is a need to explore underlying mechanisms. We investigated effects of drought on (a) in situ nitrogen (N) uptake, accounting for both, N availability to fine roots in soil and actual N uptake, (b) physiological N uptake capacity of roots and (c) the availability of new assimilates to fine roots influencing the N uptake capacity using  15 N and  13 C labelling. We assessed saplings of six different tree species ( Acer pseudoplatanus L. ,  Fagus sylvatica L. ,  Quercus petraea (Mattuschka) Liebl. ,  Abies alba Mill. ,  Picea abies (L.) H.Karst.  and  Pinus sylvestris L. ). Drought resulted in significant reduction of in situ soil N uptake in deciduous trees accompanied by reduced C allocation to roots and by a reduction in root biomass available for N uptake. Although physiological root N uptake capacity was not affected by drought in deciduous saplings, reduced maximum ammonium but not nitrate uptake was observed for  A. alba  and  P. abies . Our results indicate that drought has species-specific effects on N uptake. Even water limitations of only 5 weeks as assessed here can decrease whole-plant inorganic N uptake, independent of whether the physiological N uptake capacity is affected or not.

Effects of drought on nitrogen uptake and carbon dynamics in trees