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dc.contributor.authorTateno, Ryunosukeen
dc.contributor.authorNakayama, Masatakaen
dc.contributor.authorYano, Midorien
dc.contributor.authorFukuzawa, Karibuen
dc.contributor.authorInagaki, Yoshiyukien
dc.contributor.authorKoba, Keisukeen
dc.contributor.authorUgawa, Shinen
dc.contributor.alternative舘野, 隆之輔ja
dc.description.abstractNitrogen (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.en
dc.publisherSpringer Natureen
dc.rightsThis is a post-peer-review, pre-copyedit version of an article published in 'Trees’. The final authenticated version is available online at:
dc.rightsThe 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'en
dc.rightsThis is not the published version. Please cite only the published version.en
dc.subjectNitrate reductase activityen
dc.subjectNitrogen source utilizationen
dc.subjectNorthern hardwood foresten
dc.subjectNitrogen isotopeen
dc.titleNitrogen source utilization in co-existing canopy tree and dwarf bamboo in a northern hardwood forest in Japanen
dc.typejournal article-
dc.type.niitypeJournal Article-
dc.addressField Science Education and Research Center, Kyoto Universityen
dc.addressGraduate School of Agriculture, Kyoto Universityen
dc.addressCenter for Ecological Research, Kyoto Universityen
dc.addressNakagawa Experimental Forest, Field Science Center for Northern Biosphere, Hokkaido Universityen
dc.addressShikoku Research Center, Forestry and Forest Products Research Instituteen
dc.addressCenter for Ecological Research, Kyoto Universityen
dc.addressFaculty of Agriculture, Kagoshima Universityen
dcterms.accessRightsopen access-
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