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Title: Nitrogen source utilization in co-existing canopy tree and dwarf bamboo in a northern hardwood forest in Japan
Authors: Tateno, Ryunosuke  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-8461-3696 (unconfirmed)
Nakayama, Masataka
Yano, Midori
Fukuzawa, Karibu
Inagaki, Yoshiyuki
Koba, Keisuke  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-1942-9811 (unconfirmed)
Ugawa, Shin
Author's alias: 舘野, 隆之輔
Keywords: Nitrate reductase activity
Nitrogen source utilization
Northern hardwood forest
Mycorrhiza
Nitrogen isotope
Issue Date: Aug-2020
Publisher: Springer Nature
Journal title: Trees
Volume: 34
Start page: 1047
End page: 1057
Abstract: Nitrogen (N) competition among co-existing plant species utilizing different mycorrhiza types was explored through the investigation of N sources of oak trees and dwarf bamboo. Vertical distribution of fine roots, soil N pools, δ¹⁵N of leaves, and possible soil N sources and nitrate reductase activity (NRA) were all quantified. The fine roots of canopy trees were more concentrated in the surface soils than roots of the understory dwarf bamboo. Soil NH₄+ and extractable organic N (EON) content (based on unit weight) decreased from the organic horizon (O horizon) to the deep soils, the size of the NH₄+ pool per unit volume increased with soil depth, and the EON was approximately constant. Soil NO₃− was not detected at any soil depth or was not significant in value, while NO₃− captured by ion-exchange resin (IER) buried at a 10 cm soil depth and net nitrification were observed via laboratory incubation at all soil depths. The δ¹⁵N of the NH₄+ and EON pools increased with soil depth and the δ¹⁵N of NO₃− of IER was lower than that of other N forms, except for the δ¹⁵N of NH₄+ in the O horizon. Furthermore, root NRA tended to be lower in canopy trees than in the understory, implying lower dependency on NO₃− by canopy trees. The pattern of root distribution and mycorrhizal fungi association of the understory vegetation (as well as the high root NRA) suggested that dependence on N in deeper soils was higher in understory plants than in canopy trees. These findings indicate that understory vegetation mitigates soil N competition against co-existing canopy trees via the use of alternative N sources.
Rights: This is a post-peer-review, pre-copyedit version of an article published in 'Trees’. The final authenticated version is available online at: https://doi.org/10.1007/s00468-020-01980-1.
The full-text file will be made open to the public on 25 April 2021 in accordance with publisher's 'Terms and Conditions for Self-Archiving'
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/252829
DOI(Published Version): 10.1007/s00468-020-01980-1
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