Drought Deteriorates the N Stoichiometry of Biomass Production in European Beech Saplings Under Global Change

2021 | journal article; research paper. A publication with affiliation to the University of Göttingen.

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​Köhler, J., Yang, N., Pena, R., Polle, A. & Meier, I. C. (2021). ​Drought Deteriorates the N Stoichiometry of Biomass Production in European Beech Saplings Under Global Change. Frontiers in Forests and Global Change4, . ​doi: https://doi.org/10.3389/ffgc.2021.647360 

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Köhler, Julia; Yang, Nan; Pena, Rodica; Polle, Andrea; Meier, Ina C.
Continuous nitrogen (N) deposition has raised concerns that temperate forest ecosystems shift from N limitation to progressing phosphorus (P) limitation under global change. According to the multiple resource limitation theory, this will not only influence P economy, but also reduce N uptake and use efficiencies of trees such that growth is equally limited by N and P. We used different global change scenarios including summer drought to test the prediction of this hypothesis for the N economy of European beech (Fagus sylvatica L.) saplings. Our study demonstrates that the N uptake efficiency (NUptakeE) of beech adjusts to soil N availability and stabilizes leaf and fine root N concentrations. By contrast, both efficiencies of N use were curtailed by increasing P limitation under elevated soil N. The photosynthetic N use efficiency (PNUE) was serially reduced with decreasing soil P availability and increasing foliar N:P ratios, while the N use efficiency (NUE) decreased with increasing fine root N:P ratios. Soil drought induced relative P deficiency alike and reduced NUptakeE, PNUE, and NUE independent from the soil N:P ratios. We conclude that not only N deposition but also increasing summer droughts might affect N:P ratios, thereby inducing P imbalances and affecting the N economy of European beech saplings under global change.
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Frontiers in Forests and Global Change 
Albrecht-von-Haller-Institut für Pflanzenwissenschaften ; Fakultät für Forstwissenschaften und Waldökologie ; Büsgen-Institut ; Abteilung Forstbotanik und Baumphysiologie 
Open-Access-Publikationsfonds 2021



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