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Article Dans Une Revue Nature Ecology & Evolution Année : 2018

Isotopic evidence for oligotrophication of terrestrial ecosystems

1 Jonah Ventures
2 Appalachian Laboratory
3 Indiana University
4 CONICET - Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires]
5 UGENT - Universiteit Gent = Ghent University
6 UC - University of Cincinnati
7 Swiss Federal Institute for Forest, Snow and Landscape Research WSL
8 BioGeCo - Biodiversité, Gènes & Communautés
9 CIEP - Centro de Investigación en Ecosistemas de la Patagonia
10 CAS - Chinese Academy of Sciences
11 RIHN - Research Institute for Humanity and Nature
12 CEH - Centre for Ecology and Hydrology
13 CREAF - Centre for Ecological Research and Forestry Applications
14 Department of Forest Ecology and Management
15 Ara Institute of Canterbury
16 Institute of Botany
17 ELI - Earth and Life Institute [Louvain-La-Neuve]
18 FFPRI - Forestry and Forest Products Research Institute
19 MSU - Lomonosov Moscow State University
20 UGR - Universidad de Granada = University of Granada
21 CSIC - Consejo Superior de Investigaciones Cientificas = Spanish National Research Council
22 California State University
23 NMNH - Smithsonian National Museum of Natural History
24 Department of Geology and Geography
25 Department of Geology
26 Instituto Nacional de Tecnología Agropecuaria [UNPA, Argentina]
27 UMR ECOFOG - Ecologie des forêts de Guyane
28 UF|Biology - Department of Biology [Gainesville]
29 UNH - University of New Hampshire
30 Department of Anthropology
31 South African National Biodiversity Institute
32 University of Freiburg [Freiburg]
33 College of Resources and Environment
34 UG - University of Gdańsk
Joseph M. Craine
  • Fonction : Auteur
Lixin Wang
Pascal Boeckx
Sylvain Delzon
Peter Hietz
Yang Yang

Résumé

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.

Dates et versions

hal-02626880 , version 1 (26-05-2020)

Identifiants

Citer

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