Vegetation changes by the glacial-interglacial circle

我已经取得了超过37万至25000年BP的长岩心。来自日本西部京都附近的神代盆地。这个岩芯将提供超过37万年BP的冰川-间冰圈的连续植被历史。这份年表是基于广泛存在的特弗拉，也就是AMS 14C年代。我已经用花粉分析弄清楚了自5e以来的植被历史。在MIS5E期间(末次间冰期)，常绿栎树和柳杉在森林中占主导地位，而紫薇的现代栖息地位于日本东南部岛屿。在MIS5d-5a期间，温带针叶林发育，主要由柳杉、垂柳和柏科乔木组成，主要伴生有寒温带落叶阔叶树。在70~60KYR BP之间，以铁杉、云杉和松亚属单子松为主的松类针叶阔叶林植被占主导地位，相当于同位素阶段4。60KYR BP左右，寒温带落叶阔叶林以铁杉、栎亚属和Ostrya/Carpinus为主。温带针叶林以柏科乔木和落叶栎树为主(MIS3)。从30KYR BP到12KYR BP(管理信息系统2)，针叶林发育，由冷杉、铁杉、云杉、松树和桦树组成。12KYR BP时，Fagus crenata在森林中占优势地位。在公元12KYR BP，以Fagus crenata为主的森林在全新世早期转变为栗林，可能是受到火灾干扰的影响。全新世中期(距今6000年后)以后，柳杉、柏科乔木、常绿栎树和水曲柳在森林中占据主导地位。2500年前日本柳杉为优势种。可能是人类活动引起的火灾导致柳杉森林衰落。在那之后，植被转向落叶林，以松树为主的森林。

I have taken a long core beyond 370,000 to 25,000 yr BP. from Kamiyoshi Basin near Kyoto City in western Japan. This core will provide a continuous vegetation history of the glacial-interglacial circles beyond 370,000 yr BP. The chronology was based on widespread tephra, AMS 14C dates. I have made clear the vegetation history since MIS 5e using pollen analysis. During MIS 5e (the last interglacial), evergreen oaks and Cryptomeria japonica were dominant in forests with Lagerstroemia whose modern habitat is districted in the South Eastern Island of Japan. In the period between MIS 5d and 5a, temperate conifer forests developed, composed of Cryptomeria japonica, Sciadopitys verticillata, and Cupressaceae trees associated mainly with cool-temperate deciduous broad-leaved trees. Pinaceous conifer vegetation dominated by Tsuga, Picea, and Pinus subgenus Haploxylon was dominant between 70 and 60 kyr BP, corresponding to isotope stage 4. Around 60 kyr BP, this was followed by cool-temperate deciduous broad-leaved forests composed mainly of Fagus crenata, Quercus subgenus Lepidobalanus and Ostrya/Carpinus. Temperate conifer forests dominated by Cupressaceae trees with Lepidobalanus (deciduous oaks) occurred in the interstade (MIS 3). From 30 kyr BP to 12 kyr BP (MIS 2), the conifer forests developed, composed of Abies, Tsuga, Picea and Pine with Betula trees. In 12 kyr BP, Fagus crenata became dominant in forests. Forests dominated by Fagus crenata in 12 kyr BP, changed to chestnut forests in the early Holocene, probably affected by fire disturbances. After the middle Holocene (after 6000 yr BP), Cryptomeria japonica, Cupressaceae trees, evergreen oaks and Fagus crenata became dominant in forests. Cryptomeria japonica was predominant in 2500 yrBP. Fires probably caused by human activities made the Cryptomeria forests decline. After that, the vegetation shifted to deciduouse and pine dominated forests.