Tree water uptake enhances nitrogen acquisition in a fertilized boreal forest

17294 11 94879 2 275997 document 94879 nph.17578.pdf application/pdf 5933ab67d1d5d3fa89fb327ebe236c7f MD5 1138808 2021-08-02 15:04:15 https://pure.iiasa.ac.at/id/eprint/17294/1/nph.17578.pdf 17294 1 1 application/pdf text en public cc_by_nc_nd_4

nph.17578.pdf

published 94880 2 275999 document 94880 lightbox.jpg image/png e001603603aa008c90fa8c165a0dfb5d MD5 71140 2021-08-02 15:14:41 https://pure.iiasa.ac.at/id/eprint/17294/2/lightbox.jpg 17294 2 2 image/png other Thumbnails conversion from text to thumbnail_lightbox en public

lightbox.jpg

preview.jpg

medium.jpg

small.jpg

indexcodes.txt

http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/94879 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/94879 http://eprints.org/relation/isIndexCodesVersionOf https://pure.iiasa.ac.at/id/document/94879 archive 353 disk0/00/01/72/94 2021-07-05 09:11:14 2022-03-14 14:01:05 2021-07-05 09:11:14 article show Henriksson N. Lim H. Marshall J. Franklin O. 1791 0000-0002-0376-4140 McMurtrie R.E. Lutter R. Magh R. Lundmark T. Näsholm T. Tree water uptake enhances nitrogen acquisition in a fertilized boreal forest – but not under nitrogen poor conditions pub BNR AFE 15N; Pinus sylvestris (Scots pine); deuterium; diffusion; isotope; mass flow; nitrogen uptake; water uptake 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 15 N and 2 H 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 15 N as in the low-N stand and around half of their N uptake was dependent on water uptake (2 H enrichment). In 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 but 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. 2021-06-24 published Wiley-Blackwell 10.1111/nph.17578 95 public New Phytologist 232 113-122 TRUE 1469-8137 FALSE no info:eu-repo/semantics/article