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Effects of clear-cutting on nitrogen leaching and fine root dynamics in a cool-temperate forested watershed in northern Japan

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Title: Effects of clear-cutting on nitrogen leaching and fine root dynamics in a cool-temperate forested watershed in northern Japan
Authors: Fukuzawa, Karibu Browse this author →KAKEN DB
Shibata, Hideaki Browse this author →KAKEN DB
Takagi, Kentaro Browse this author →KAKEN DB
Nomura, Mutsumi Browse this author
Kurima, Noriko Browse this author
Fukazawa, Tatsuya Browse this author
Satoh, Fuyuki Browse this author →KAKEN DB
Sasa, Kaichiro Browse this author →KAKEN DB
Keywords: fine root biomass
nitrate
Sasa dwarf bamboo
soil solution
stream chemistry
Issue Date: 15-Apr-2006
Publisher: Elsevier
Journal Title: Forest ecology and management
Volume: 225
Issue: 1-3
Start Page: 257
End Page: 261
Publisher DOI: 10.1016/j.foreco.2006.01.001
Abstract: Stream and soil solution chemistry, fine root biomass and soil nitrogen processing before and after clear-cutting of trees and subsequent strip-cutting of understory vegetation, dwarf bamboo (Sasa senanensis), were investigated to understand the effect of these disturbances on biogeochemical processes on forested watershed in northern Japan. Tree-cutting did not cause a significant increase of nitrate (NO3−) concentration in stream water during the growing season after the cutting. Subsequent Sasa-cutting caused significant increase of stream NO3− concentration to ca. 15 μmol L−1. There was no significant change of stream pH following both cuttings. NO3− concentration in soil solution increased after both cutting, but the change of concentration was higher (>100 μmol L−1) after the Sasa-cutting than after the tree-cutting. In a riparian conserved area, on the other hand, NO3− in soil solution remained low after tree-cutting, suggesting the riparian area acted as a NO3− sink after the tree-cutting. There was no significant change in total biomass of fine roots after the tree-cutting because of an increase in Sasa root biomass despite a decrease in tree roots. The subsequent Sasa-cutting caused a 50% decrease of fine root biomass compared to that in the un-cut Sasa site. These results suggested that nitrogen uptake by Sasa was very important in preventing nitrogen leaching after tree-cutting, and decline of this nitrogen uptake after Sasa-cutting lead to marked NO3− leaching to the stream.
Rights: © 2006 Elsevier B.V.
Relation: http://www.sciencedirect.com/science/journal/03781127
Type: article (author version)
URI: http://hdl.handle.net/2115/8541
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 福澤 加里部

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