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Removal of understory dwarf bamboo (Sasa kurilensis) induces changes in water-relations characteristics of overstory Betula ermanii trees

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Title: Removal of understory dwarf bamboo (Sasa kurilensis) induces changes in water-relations characteristics of overstory Betula ermanii trees
Authors: Ishii, Hiroaki T. Browse this author
Kobayashi, Tsuyoshi Browse this author
Uemura, Shigeru Browse this author →KAKEN DB
Takahashi, Koichi Browse this author
Hanba, Yuko T. Browse this author
Sumida, Akihiro Browse this author →KAKEN DB
Hara, Toshihiko Browse this author
Keywords: hydraulic homeostasis
sap flow
shoot morphology
understory management
water relations
Issue Date: Apr-2008
Publisher: Springer
Journal Title: Journal of Forest Research
Volume: 13
Issue: 2
Start Page: 101
End Page: 109
Publisher DOI: 10.1007/s10310-007-0058-0
Abstract: We investigated how removal of understory dwarf bamboo (Sasa kurilensis Makino et Shibata) affected growth and water-use of young Betula ermanii Cham. trees in a secondary forest in northern Japan. We compared current-year shoot morphology, leaf water-relations characteristics and whole-tree water use of B. ermanii trees growing with dwarf bamboo in the understory (intact plot) to those of trees growing where dwarf bamboo was experimentally removed (removal plot). Current-year shoot length and internode frequency increased, while internode length and individual leaf area decreased in response to dwarf bamboo removal. Carbon isotope composition (δ13C) of leaves did not change indicating that leaf water-use efficiency was unaffected by the presence/absence of dwarf bamboo. Pressure-volume analysis indicated that leaves in the removal plot had lower water uptake ability. During mid-summer, trees in the removal plot sustained high sap flow velocity after peaking at midday, while that of trees in the intact plot declined. In addition, whole-tree sap flux and soil-to-leaf hydraulic conductance were both higher for trees in the removal plot. We inferred that the observed changes reflect hydraulic homeostasis of B. ermanii trees to maintain constant water-use efficiency in response to belowground competition with dwarf bamboo. Removal of dwarf bamboo is, therefore, an effective silvicultural prescription to enhance growth of overstory trees by relieving belowground competition for soil water.
Rights: The original publication is available at www.springerlink.com
Relation: http://www.springerlink.com
Type: article (author version)
URI: http://hdl.handle.net/2115/32745
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 石井 弘明

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