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Organic nitrogen enhances nitrogen nutrition and early growth of Pinus sylvestris seedlings

Lim, Hyungwoo and Jämtgård, Sandra and Oren, Ram and Gruffman, Linda and Kunz, Sabine and Näsholm, Torgny (2021). Organic nitrogen enhances nitrogen nutrition and early growth of Pinus sylvestris seedlings. Tree Physiology. 42 :3 , 513-522
[Research article]

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Abstract

Boreal trees are capable of taking up organic nitrogen (N) as effectively as inorganic N. Depending on the abundance of soil N forms, plants may adjust physiological and morphological traits to optimize N uptake. However, the link between these traits and N uptake in response to soil N sources is poorly understood. We examined Pinus sylvestris L. seedlings' biomass growth and allocation, transpiration and N uptake in response to additions of organic N (the amino acid arginine) or inorganic N (ammonium nitrate). We also monitored in situ soil N fluxes in the pots following an addition of N, using a microdialysis system. Supplying organic N resulted in a stable soil N flux, whereas the inorganic N resulted in a sharp increase of nitrate flux followed by a rapid decline, demonstrating a fluctuating N supply and a risk for loss of nitrate from the growth medium. Seedlings supplied with organic N achieved a greater biomass with a higher N content, thus reaching a higher N recovery compared with those supplied inorganic N. In spite of a higher N concentration in organic N seedlings, root-to-shoot ratio and transpiration per unit leaf area were similar to those of inorganic N seedlings. We conclude that enhanced seedlings' nutrition and growth under the organic N source may be attributed to a stable supply of N, owing to a strong retention rate in the soil medium.

Authors/Creators:Lim, Hyungwoo and Jämtgård, Sandra and Oren, Ram and Gruffman, Linda and Kunz, Sabine and Näsholm, Torgny
Title:Organic nitrogen enhances nitrogen nutrition and early growth of Pinus sylvestris seedlings
Series Name/Journal:Tree Physiology
Year of publishing :2021
Volume:42
Number:3
Page range:513-522
Number of Pages:10
Publisher:OXFORD UNIV PRESS
ISSN:0829-318X
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:amino acids, arginine, microdialysis, nitrate, soil N availability, water-use efficiency
URN:NBN:urn:nbn:se:slu:epsilon-p-116402
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-116402
Additional ID:
Type of IDID
DOI10.1093/treephys/tpab127
Web of Science (WoS)000764671900001
ID Code:28855
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
(S) > Dept. of Forest Genetics and Plant Physiology
Deposited By: SLUpub Connector
Deposited On:15 Sep 2022 11:25
Metadata Last Modified:15 Sep 2022 11:31

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