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Isotopic evidence for oligotrophication of terrestrial ecosystems

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Craine, Joseph M. [Jonah Ventures, USA] Elmore, Andrew J. [University of Maryland, USA] Wang, Lixin [Indiana University - Purdue University Indianapolis, USA] Aranibar, Julieta [Instituto Argentino de Nivologia, Argentina] Bauters, Marijn [Ghent University, Belgium] Jonard, Mathieu [UCL] Zmudczyńska-Skarbek, Katarzyna [University of Gdansk, Poland]

Human societies depend on an Earth system that operates within a constrained range of nutrient availability, yet the recent trajectory of terrestrial nitrogen (N) availability is uncertain. Examining patterns of foliar N concentrations and isotope ratios (δ 15N) from more than 43,000 samples acquired over 37 years, here we show that foliar N concentration declined by 9% and foliar δ 15N declined by 0.6–1.6‰. Examining patterns across different climate spaces, foliar δ 15N declined across the entire range of mean annual temperature and mean annual precipitation tested. These results suggest declines in N supply relative to plant demand at the global scale. In all, there are now multiple lines of evidence of declining N availability in many unfertilized terrestrial ecosystems, including declines in δ 15N of tree rings and leaves from herbarium samples over the past 75–150 years. These patterns are consistent with the proposed consequences of elevated atmospheric carbon dioxide and longer growing seasons. These declines will limit future terrestrial carbon uptake and increase nutritional stress for herbivores.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2018
Language Anglais
Journal information "Nature Ecology & Evolution" - Vol. 2, no. 11, p. 1735-1744 (2018)
Peer reviewed yes
Publisher Springer Nature America, Inc
e-issn 2397-334X
Publication status Publié
Affiliation UCL - SST/ELI/ELIE - Environmental Sciences
Keywords isotopic ; oligotrophication ; terrestrial ecosystems ; sylviculture ; foliar
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Permanent URL http://hdl.handle.net/2078.1/204279