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Isotopic evidence for oligotrophication of terrestrial ecosystems

Joseph M. Craine 1 Andrew J. Elmore 2 Lixin Wang 3 Julieta Aranibar 4 Marijn Bauters 5 Pascal Boeckx 5 Brooke E. Crowley 6 Melissa A. Dawes 7 Sylvain Delzon 8 Alex Fajardo 9 Yunting Fang 10 Lei Fujiyoshi 11 Alan Gray 12 Rossella Guerrieri 13 Michael J. Gundale 14 David J. Hawke 15 Peter Hietz 16 Mathieu Jonard 17 Elizabeth Kearsley 5 Tanaka Kenzo 18 Mikhail Makarov 19 Sara Marañon-Jimenez 20, 13, 21 Terrence P. Mcglynn 22, 23 Brenden E. Mcneil 24 Stella G. Mosher 25 David M. Nelson 2 Pablo L. Peri 26 Jean-Christophe Roggy 27 Rebecca Sanders-Demott 28, 29 Minghua Song 10 Paul Szpak 30 Pamela H. Templer 28 Dewidine van der Colff 31 Christiane Werner 32 Xingliang Xu 29 Yang Yang 10 Guirui Yu 10, 33 Katarzyna Zmudczyńska-Skarbek 34
Abstract : 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 (δ15N) from more than 43,000 samples acquired over 37 years, here we show that foliar N concentration declined by 9% and foliar δ15N declined by 0.6–1.6‰. Examining patterns across different climate spaces, foliar δ15N 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 δ15N 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.
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https://hal.inrae.fr/hal-02626880
Déposant : Migration Prodinra <>
Soumis le : mardi 26 mai 2020 - 18:18:38
Dernière modification le : samedi 13 février 2021 - 03:31:37

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Joseph M. Craine, Andrew J. Elmore, Lixin Wang, Julieta Aranibar, Marijn Bauters, et al.. Isotopic evidence for oligotrophication of terrestrial ecosystems. Nature Ecology & Evolution, Nature, 2018, 2 (11), pp.1735-1744. ⟨10.1038/s41559-018-0694-0⟩. ⟨hal-02626880⟩

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