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

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