Vegetation change in the main island of Okinawa, southern Japan from late Pliocene to early Pleistocene
Vegetation change in the main island of Okinawa, southern Japan from late Pliocene to early Pleistocene
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DOI：
10.1016/j.quaint.2007.09.009
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发表时间：
2008-06-01
影响因子：
2.2
通讯作者：
Wawa, Tomowo
中科院分区：
文献类型：
--
作者：
Fujiki, Toshiyuki;Wawa, Tomowo
样品取自冲绳主岛上新世晚期至更新世早期形成的五个露头。这五个地点分别位于Sonan、Yabu、Oyakawa、Akakimata和Goga。Sonan和Yabu的年龄约为1.0-0.8 Ma，Oyakawa的年龄约为1.5 Ma，Akakimata的年龄约为1.7 Ma，Goga的年龄约为1.9 Ma。单木和柳杉，榆属、泽尔科娃属、枫香属和紫薇属落叶阔叶树，以及常绿栎属和山杨属常绿阔叶树。这一花粉剖面与日本大陆上一次间冰期的花粉剖面相似。冷杉、铁杉、松亚属针叶树种。单木属、Keteleeria和Cryptomeria一直存在到上新世晚期。目前这些分类群在琉球群岛上还不存在。上新世末期(1.78 Ma)，冷杉、铁杉和油杉花粉消失。从晚上新世到早更新世，日本主岛和冲绳主岛的气候迅速变冷，许多第三纪植物消失。约1.7 Ma时，紫薇花粉突然增多。构造活动迅速，其他植被物种不能适应。随后，约1.5 Ma，松树亚属。单木、榆属、泽尔科娃和柳杉花粉增加。这一时期与退化联系在一起，气候凉爽潮湿。松属亚属浮游植物和常绿阔叶树的花粉粒增多，约1.0-0.8 Ma，气候温暖。随后，冲绳主岛的气候变得与现在的气候相似。现代常绿阔叶林的形成时间约为0.8 Ma。(C)2007年由爱思唯尔有限公司出版。
Samples were taken from five outcrops that formed from late Pliocene to early Pleistocene oil the main island of Okinawa. The five sites are located in Sonan, Yabu, Oyakawa, Akakimata and Goga. The age of Sonan and Yabu is ca. 1.0-0.8 Ma, that of Oyakawa is ca. 1.5 Ma, that of Akakimata is ca. 1.7 Ma and that of Goga predates ca. 1.9 Ma.Pollen analysis of these sediments revealed the following types occur together: the coniferous trees of Pinus subgen. Haploxylon and Cryptomeria, the deciduous broadleaved trees of Ulmus, Zelkova, Liquidamber and Lagerstroemia, and the evergreen broadleaved trees of Castanopsis and Symplocos. This pollen profile is similar to that of the last interglacial period in the Japanese mainland. The coniferous trees of Abies, Tsuga, Pinus subgen. Haploxylon, Keteleeria and Cryptomeria appear until the late Pliocene. Presently these taxa, are not present on the Ryukyu Islands. Abies, Tsuga and Keteleeria pollen disappeared by the end of the Pliocene (1.78 Ma). The climate became cold rapidly and many Tertiary plants disappeared from late Pliocene to early Pleistocene in the Japanese main islands, as well as on the main island of Okinawa. At ca. 1.7 Ma, Lagerstroemia pollen suddenly increased. Tectonic activity was rapid and the other vegetation species could not adapt. Subsequently, ca. 1.5 Ma, Pinus subgen. Haploxylon, Ulmus, Zelkova and Cryptomeria pollen increased. This period is associated with regression and the climate was cool and wet. Pinus subgen. Diploxylon and evergreen broadleaved tree pollen grains increased, ca. 1.0-0.8 Ma, and the climate was warm. Subsequently, the climate became similar to the present climate in the main island of Okinawa. The formation of the modern evergreen broadleaved forest, dominated by Castanopsis sieboldii, dated from ca. 0.8 Ma. (c) 2007 Published by Elsevier Ltd.