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

Henriksson, Nils and Lim, Hyungwoo and Marshall, John and Marshall, John D and Franklin, Oskar and McMurtrie, Ross E. and Lutter, Reimo and Magh, Ruth and Lundmark, Tomas and Näsholm, Torgny (2021). Tree water uptake enhances nitrogen acquisition in a fertilized boreal forest - but not under nitrogen-poor conditions. New Phytologist. 232 , 113-122
[Research article]

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Abstract

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.

Authors/Creators:Henriksson, Nils and Lim, Hyungwoo and Marshall, John and Marshall, John D and Franklin, Oskar and McMurtrie, Ross E. and Lutter, Reimo and Magh, Ruth and Lundmark, Tomas and Näsholm, Torgny
Title:Tree water uptake enhances nitrogen acquisition in a fertilized boreal forest - but not under nitrogen-poor conditions
Series Name/Journal:New Phytologist
Year of publishing :2021
Volume:232
Page range:113-122
Number of Pages:10
Publisher:WILEY
ISSN:0028-646X
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:N-15, deuterium, diffusion, isotope, mass flow, nitrogen uptake, Pinus sylvestris (Scots pine), water uptake
URN:NBN:urn:nbn:se:slu:epsilon-p-113224
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-113224
Additional ID:
Type of IDID
DOI10.1111/nph.17578
Web of Science (WoS)000675530300001
ID Code:25311
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:13 Sep 2021 05:25
Metadata Last Modified:13 Sep 2021 05:31

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