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Title: 芦生上谷流域の植物多様性と群集構造 : トランセクトネットワークによる植物群集と希少植物の検出
Other Titles: Plant species diversity and community structure of old-growth beech forest in Kamitani, Ashiu, Kyoto : Community structure and endangered plant species detected by gradsect networks
Authors: 阪口, 翔太  kyouindb  KAKEN_id  orcid (unconfirmed)
藤木, 大介  KAKEN_name
井上, みずき  KAKEN_name
高柳, 敦  KAKEN_name
Author's alias: Sakaguchi, Shota
Fujiki, Daisuke
Inoue, Mizuki
Takayanagi, Atsushi
Keywords: 植物多様性
Plant species diversity
Community structure
Endangered plant
Sika deer
Issue Date: 26-Dec-2008
Publisher: 京都大学フィールド科学教育研究センター森林生物圏部門
Journal title: 森林研究
Volume: 77
Start page: 43
End page: 61
Abstract: 京都大学芦生研究林の北東部に位置する上谷流域の天然林において, 集水域スケールでの植物群集構造と植物多様性, 希少植物の分布状況について調査を行った.その結果, 芦生上谷流域には4つの植物群集単位を認めるのが適当であること, それらの群集が地形要因によって規定され, モザイク状に分布しているというのが本地域の植物群集構造の特徴であることが明らかにされた.植物多様性については, 尾根地形に出現する群集よりも谷地形に出現する群集で種多様性が高く, とくに森林下層空間に生育している草本種やシダ植物種が豊富であることが明らかとなった.また, 着生種を含む24種のレッドデータブック記載種を確認することができた.近年, 芦生研究林ではニホンジカによる下層植生の改変やカシノナガキクイムシによるミズナラ大径木の集団枯損が発生しており, 前者は植物多様性や植物群集組成に対して, また後者は希少着生植物相に負の影響をもたらすことが懸念される.
Plant community structure, species diversity, and existences of endangered species were investigated in the old-growth beech forest in Kamitani area, northern part of Kyoto university forest of Ashiu. Utilizing gradsect networks of total 3390m long, we first clarified that four types of plant communities dominated in the forest and the distribution patterns of these communities were strongly associated with topography. The communities developing in the streamside sites were more species-rich than the ones in the ridge sites. There were considerably higher occurrences of the forest floor plants, such as herb and fern species, in the streamside communities than the ridge communities. This compositional differences in plant life form between the communities can explain the higher internal a diversity in the streamside communities. Total 24 species of red-listed plants including 7 epiphytic species were detected in our survey. In recent years, the overabundance of sika deer and the mass mortality of fagaceous trees caused by the attacks of ambrosia beetles are reported in the study area. Our results suggest these two ecological factors would have negative impacts on plant species diversity and composition in the forest floor and survivals of epiphytic species respectively.
Description: 特集 : ニホンジカの森林生態系へのインパクト: 芦生研究林
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