Changes in forest nitrogen cycling across deposition gradient revealed by δ 15 N in tree rings.

Autor: Oulehle F; Czech Geological Survey, Klárov 3, 118 21, Prague, Czech Republic; Global Change Research Institute of the Czech Academy of Sciences, Bělidla 986/4a, 603 00, Brno, Czech Republic. Electronic address: filip.oulehle@geology.cz., Tahovská K; Department of Ecosystem Biology, Faculty of Science, University of South Bohemia, Branišovská 31, 370 05, České Budějovice, Czech Republic., Ač A; Global Change Research Institute of the Czech Academy of Sciences, Bělidla 986/4a, 603 00, Brno, Czech Republic., Kolář T; Global Change Research Institute of the Czech Academy of Sciences, Bělidla 986/4a, 603 00, Brno, Czech Republic; Department of Wood Science and Technology, Faculty of Forestry and Wood Technology, Mendel University in Brno, 613 00, Brno, Czech Republic., Rybníček M; Global Change Research Institute of the Czech Academy of Sciences, Bělidla 986/4a, 603 00, Brno, Czech Republic; Department of Wood Science and Technology, Faculty of Forestry and Wood Technology, Mendel University in Brno, 613 00, Brno, Czech Republic., Čermák P; Department of Forest Protection and Wildlife Management, Faculty of Forestry and Wood Technology, Mendel University in Brno, 613 00, Brno, Czech Republic., Štěpánek P; Global Change Research Institute of the Czech Academy of Sciences, Bělidla 986/4a, 603 00, Brno, Czech Republic., Trnka M; Global Change Research Institute of the Czech Academy of Sciences, Bělidla 986/4a, 603 00, Brno, Czech Republic., Urban O; Global Change Research Institute of the Czech Academy of Sciences, Bělidla 986/4a, 603 00, Brno, Czech Republic., Hruška J; Czech Geological Survey, Klárov 3, 118 21, Prague, Czech Republic; Global Change Research Institute of the Czech Academy of Sciences, Bělidla 986/4a, 603 00, Brno, Czech Republic.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2022 Jul 01; Vol. 304, pp. 119104. Date of Electronic Publication: 2022 Mar 14.
DOI: 10.1016/j.envpol.2022.119104
Abstrakt: Tree rings provide valuable insight into past environmental changes. This study aimed to evaluate perturbations in tree ring width (TRW) and δ 15 N alongside soil acidity and nutrient availability gradients caused by the contrasting legacy of air pollution (nitrogen [N] and sulphur [S] deposition) and tree species (European beech, Silver fir and Norway spruce). We found consistent declines of tree ring δ 15 N, which were temporarily unrelated to the changes in the TRW. The rate of δ 15 N change in tree rings was related to the contemporary foliar carbon (C) to phosphorus (P) ratio. This observation suggested that the long-term accumulation of 15 N depleted N in tree rings, likely mediated by retained N from deposition, was restricted primarily to stands with currently higher P availability. The shifts observed in tree-ring δ 15 N and TRW suggest that acidic air pollution rather than changes in stand productivity determined alteration of N and C cycles. Stable N isotopes in tree rings provided helpful information on the trajectory of the N cycle over the last century with direct consequences for a better understanding of future interactions among N, P and C cycles in terrestrial ecosystems.
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Databáze: MEDLINE
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