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Tree water uptake enhances nitrogen acquisition in a fertilized boreal forest but not under nitrogen-poor conditions

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    0559316 - ÚVGZ 2023 RIV GB eng J - Článek v odborném periodiku
    Henriksson, N. - Lim, H. - Marshall, John David - Franklin, O. - McMurtrie, R. E. - Lutter, R. - Magh, R. - Lundmark, T. - Nasholm, T.
    Tree water uptake enhances nitrogen acquisition in a fertilized boreal forest but not under nitrogen-poor conditions.
    New Phytologist. Roč. 232, č. 1 (2021), s. 113-122. ISSN 0028-646X. E-ISSN 1469-8137
    Institucionální podpora: RVO:86652079
    Klíčová slova: n-15 * deuterium * diffusion * isotope * mass flow * nitrogen uptake * Pinus sylvestris (Scots pine) * water uptake
    Obor OECD: Plant sciences, botany
    Impakt faktor: 10.323, rok: 2021
    Způsob publikování: Open access
    https://nph.onlinelibrary.wiley.com/doi/10.1111/nph.17578

    Understanding how plant water uptake interacts with acquisition of soil nitrogen (N) and other nutrients is fundamental for predicting plant responses to a changing environment, but it is an area where models disagree. We present a novel isotopic labelling approach which reveals spatial patterns of water and N uptake, and their interaction, by trees. The stable isotopes N-15 and H-2 were applied to a small area of the forest floor in stands with high and low soil N availability. Uptake by surrounding trees was measured. The sensitivity of N acquisition to water uptake was quantified by statistical modelling. Trees in the high-N stand acquired twice as much N-15 as in the low-N stand and around half of their N uptake was dependent on water uptake (H-2 enrichment). By contrast, in the low-N stand there was no positive effect of water uptake on N uptake. We conclude that tree N acquisition was only marginally dependent on water flux toward the root surface under low-N conditions whereas under high-N conditions, the water-associated N uptake was substantial. The results suggest a fundamental shift in N acquisition strategy under high-N conditions.
    Trvalý link: https://hdl.handle.net/11104/0332643

     
     
Počet záznamů: 1