【6巻2号】1999

植生史研究 第6巻第2号（1999年4月発行）

[巻頭写真]
赤石山脈北西部，疋女淵山のヤツガタケトウヒ・ヒメバラモミ優占林
野手啓行・百原新・沖津進, PDF

秋田県大館市池内における十和田八戸テフラに埋積した森林植生と年輪年代学の適用
寺田和雄・辻誠一郎, p39-47, PDF

大館市池内(いけない)の十和田八戸テフラ下の埋没林(約13,000年前)において，その森林植生の復元と年輪年代学的研究を行った。この埋没林は十和田火山東方に位置しているため,十和田八戸テフラの下部の降下テフラ（To-HP）は堆積せず，上部の火砕流堆積物（To-H）のみにおおわれていた。埋没林の木材化石の樹種同定の結果，トウヒ属が90%，モミ属10%であったことから，トウヒ属の優占する植生であったと考えられた。トウヒ属5個体の円盤を採集し、その年輪幅を測定し，クロスデイティングを行った。その結果，それらはクロスデイティングが成立し，3個体の最終形成年輪の形成年が一致した。さらに，以前の研究で十和田火山東方の同じ八戸テフラ下の埋没林で作製したトウヒ属の標準年輪指数と照合したところ，クロスデイティングが可能となり，十和田火山東方の埋没林と同じ年に死滅したことが明らかになった。また，最終形成年輪の年輪構造の観察から，その年の晩材形成がすでに終了しており，この埋没林は，ある年の秋から次の春までの間に死滅したことがわかった。この結果は十和田火山東方の埋没林の結果と一致し，同時に起きた十和田火山の噴火により，短時間のあいだに埋積され，死滅したこと が明らかになった。

Habitat of Plants in the Late Pliocene Sedimentary Basin on Awaji Island, Central Japan
Arata Momohara・Kiyohide Mizuno, p49-62, PDF

Late Pliocene plant macrofossil assemblages on Awaji Island, central Japan, were studied to reconstruct the habitat of plants and to complement the upper Pliocene biostratigraphy of the Osaka Group. The Lower part of the Atago Formation yeilds many plants extinct from Japan and includes Choerospondias axillaris and Reevesia sp. that characterize the basal part of the Osaka Group in the Sennan area. Stratigraphic occurrence of plant fossils in the upper Pliocence on Awaji Island is very similar to that in the Sennan area. Sedimentary facies of fossil bearing beds were classified into three types, i.e., peat, massive silt, and stratified sand, and occurrence of plant taxa was compared between these types to reconstruct their habitat. Glyptostrobus pensilis, Trapa and Nymphaeaceae inculuded in peat were growing in backmarshes in an alluvial plain. Plants common in massive silt, such as Metasequoia glyptostroboides, Stewartia monadepha, Sequoia sp., and Pseudolarix amabilis, composed forests in wetlands and on sandbanks in an alluvial plain. Plants common in stratified sand, such as Picea sect. Picea, Buxus microphylla, and Fagus microcarpa, grew on fans and mountain slopes around a sedimentary basin.

Species Selection for Wooden Artefacts at the Yoshinogari Site, Saga Prefecture, Japan
Shuichi Noshiro・Mitsuo Suzuki・Sei-ichiro Tsuji, p63-78, PDF

The Yoshinogari Site in northern Kyushu was one of the nuclear sites of the Yayoi Period and continued up to the Middle Age. Wooden artefacts recovered at this site, mainly of the Middle and Late Yayoi and Nara Periods, included ca. 50 taxa. Species selection for 660 wooden artefacts shows that as many as 44 taxa were selected more or less equally during the Yayoi Period, whereas Abies was used among 28 taxa, for half of the artefacts in the Nara Period. For building and construction timber, Castanea crenata was preferred for foundation timber and posts but with 18 other taxa during the Yayoi Period, whereas Abies was used nearly exclusively for well members and flat grain boards and Castanea crenata for posts together with eight other taxa in the Nara Period. For other artefacts, Quercus subgen. Cyclobalanopsis for cultivation and manufacturing tools of both periods and Abies for magemono containers of the Nara Period are conspicuous. Usage of Aphananthe aspera, Celtis, and Morus during the Yayoi Period and their obscurity in the Nara Period in spite of continued usage of evergreen laurel elements agree with vegetation changes reconstructed from pollen and plant macrofossil assemblages at this site.

大阪狭山市狭山池堆積物から検出されたワタ（Gossypium indicum Lam.）花粉
松下まり子・金子雅一, PDF

古代の仏像の樹種はカヤであるのか??
鈴木三男, PDF

[書評]
日本木材学会組織と材質研究会(日本語版監修).広葉樹材の識別.IAWA による光学顕微鏡的特徴リスト
IAWA委員会(編集)
図説日本列島植生史
安田喜憲,三好教夫編.1998, PDF