Journal
FRONTIERS IN FORESTS AND GLOBAL CHANGE
Volume 4, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/ffgc.2021.647360
Keywords
drought; Fagus sylvatica; nitrogen deposition; phosphorus limitation; uptake efficiency; use efficiency
Funding
- Volkswagen Foundation [11-76251-99-34/13(ZN 2928)]
- Natural Science Foundation of Jiangsu Province [BK20180767]
- Deutsche Forschungsgemeinschaft [PE 2256/1-1]
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Continuous nitrogen deposition and increasing summer droughts may affect the N:P ratios of European beech saplings, leading to phosphorus imbalances and influencing their N economy under global change.
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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