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ID 36991
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Tree Distribution in an Evergreen Broadleaf Forest on Miyajima with Reference to Topography <Article>
creator
NDC
Botany
abstract
We studied the vegetation of an evergreen broadleaf forest on Miyajima Island (also known as Itsukushima Island) Hiroshima Prefecture, Japan, with respect to topography. We established two 0.6-ha plots (P-1 and P-2) at an elevation of about 100 m in the northeastern part of the island. In the P-1 and P-2 plots, we found 1,212 and 1,478 trees, respectively, over 15 cm in girth at breast height, which consisted of 29 and 28 species. The basal areas of the plots (27.9 m² ha⁻¹ and 31.0 m² ha⁻¹ in P-1 and P-2, respectively) were much smaller than basal areas of old-growth forests in warm-temperate Japan. This may suggest that the forests at the study site are not yet fully developed. Only three large Abies firma trees accounted for over 10% of total basal area in P-2, which demonstrates that large trees provide important carbon-storage microsites in this forest. Hierarchical and non-hierarchical cluster analyses both revealed that a close relationship exists between tree distribution and topography. A. firma, Symplocos glauca, and Neolitsea sericea occurred more frequently in valley sites; Pinus densiflora, Lyonia ovalifolia var. elliptica, Ilex pedunculosa, and Eurya japonica occurred more frequently on ridge sites. A comparison of our vegetation data to data collected some 40 years ago indicates that the population of Rhododendron kaempferi has declined in size. This reduction may be attributed to browsing stress caused by the dense population of sika deer (Cervus nippon) that inhabit the island.
description
本研究は,環境省モニタリング1000の事業(森林・草原著調査)の一環として実施され、(財)自然環境センターより資金の援助を受けたものである。
journal title
Bulletin of the Graduate School of Integrated Arts and Sciences, Hiroshima University. II, Studies in environmental sciences
volume
Volume 9
start page
19
end page
28
date of issued
2014-12-31
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
Copyright (c) 2014 Graduate School of Integrated Arts and Sciences, Hiroshima University. All rights reserved.
department
Graduate School of Integrated Arts and Sciences
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