Global patterns of foliar nitrogen isotopes and their relationships with climate, mycorrhizal fungi, foliar nutrient concentrations, and nitrogen availability

Joseph M. Craine, Andrew J. Elmore, Marcos P.M. Aidar, Mercedes Bustamante, Todd E. Dawson, Erik A. Hobbie, Ansgar Kahmen, Michelle C. MacK, Kendra K. McLauchlan, Anders Michelsen, Gabriela B. Nardoto, Linda H. Pardo, Josep Peñuelas, Peter B. Reich, Edward A.G. Schuur, William D. Stock, Pamela H. Templer, Ross A. Virginia, Jeffrey M. Welker, Ian J. Wright

    Research output: Contribution to journalReview articleResearchpeer-review

    548 Citations (Scopus)

    Abstract

    Ratios of nitrogen (N) isotopes in leaves could elucidate underlying patterns of N cycling across ecological gradients. To better understand global-scale patterns of N cycling, we compiled data on foliar N isotope ratios (δ15N), foliar N concentrations, mycorrhizal type and climate for over 11 000 plants worldwide. Arbuscular mycorrhizal, ectomycorrhizal, and ericoid mycorrhizal plants were depleted in foliar δ15N by 2‰, 3.2‰, 5.9‰, respectively, relative to nonmycorrhizal plants. Foliar δ15N increased with decreasing mean annual precipitation and with increasing mean annual temperature (MAT) across sites with MAT ≥ -0.5°C, but was invariant with MAT across sites with MAT < -0.5°C. In independent landscape-level to regional-level studies, foliar δ15N increased with increasing N availability; at the global scale, foliar δ15N increased with increasing foliar N concentrations and decreasing foliar phosphorus (P) concentrations. Together, these results suggest that warm, dry ecosystems have the highest N availability, while plants with high N concentrations, on average, occupy sites with higher N availability than plants with low N concentrations. Global-scale comparisons of other components of the N cycle are still required for better mechanistic understanding of the determinants of variation in foliar δ15N and ultimately global patterns in N cycling.
    Original languageEnglish
    Pages (from-to)980-992
    JournalNew Phytologist
    Volume183
    Issue number4
    DOIs
    Publication statusPublished - 1 Sep 2009

    Keywords

    • Climate
    • Isotopes
    • Mycorrhizal fungi
    • Nitrogen
    • Nitrogen availability

    Fingerprint

    Dive into the research topics of 'Global patterns of foliar nitrogen isotopes and their relationships with climate, mycorrhizal fungi, foliar nutrient concentrations, and nitrogen availability'. Together they form a unique fingerprint.

    Cite this