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ID 47117
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title alternative
Landslide History Detected Based on Forest Structure: A Case Study on Mt. Gagara, Higashi-Hiroshima
creator
Yokota, Kazuo
NDC
Earth sciences. Geology
abstract
Variations in tree species composition, tree density, and basal area were studied in relation to microtopography along the hills of Mt. Gagara within the campus of Hiroshima University, Higashi-Hiroshima, where landslides have occurred frequently. Ten sampling plots with a size of 100 m2 (10 m×10 m) were positioned in upper and lower parts of the hills. Tree density was significantly higher in the lower parts than in the upper parts of the hills (p < 0.001). The density of trees with smaller diameters at breast height (DBH; < 13 cm ) was significantly higher in the lower parts than in the upper parts of the hills (p < 0.001), whereas the density of large- or middlesized trees (DBH ≧ 13 cm) was signifi cantly higher in the upper parts of the hills. The species composition in the lower hills mostly consisted of early successional tree species (e.g., Eurya japonica, Pieris japonica, Ilex pedunculosa, and Rhododendron reticulatum), whereas the upper parts of the hills rarely or never included such species but mainly consisted of late successional tree species (e.g., Symplocos lucida, and Quercus glauca). These trends indicate that forest vegetation on the lower parts of the hills has been disturbed by frequently occurring erosion and landslides, which have resulted in suppressed maturity of forest structure and species succession.
journal title
Bulletin of the Graduate School of Integrated Arts and Sciences, Hiroshima University. II, Studies in environmental sciences
volume
Volume 13
start page
53
end page
63
date of issued
2018-12-31
publisher
広島大学大学院総合科学研究科
issn
1881-7696
ncid
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
rights
掲載された論文,研究ノート,要旨などの出版権・著作権は広島大学大学院総合科学研究科に帰属する。
Copyright (c) 2018 Graduate School of Integrated Arts and Sciences, Hiroshima University, All rights reserved.
department
Graduate School of Integrated Arts and Sciences
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