Middle-and late-Holocene environments and vegetation history of Kunashir Island, Kurile Islands, northwestern Pacific
Middle-and late-Holocene environments and vegetation history of Kunashir Island, Kurile Islands, northwestern Pacific
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DOI：
10.1191/095968300667552216
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发表时间：
2000-04
期刊：
影响因子：
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通讯作者：
A. Korotky;N. Razjigaeva;T. Grebennikova;L. Ganzey;L. Mokhova;V. Bazarova;L. Sulerzhitsky;K. Lutaenko
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文献类型：
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作者：
A. Korotky;N. Razjigaeva;T. Grebennikova;L. Ganzey;L. Mokhova;V. Bazarova;L. Sulerzhitsky;K. Lutaenko
国后岛全新世中晚期自然环境演变反映了全球气候变化和冷暖气流的迁移。干凉气候向暖湿气候转变的时间约为7000-6500 BP，晚于北海道岛。此时黑潮系统变得更加活跃。在国后岛桦树组合所取代的冷温带阔叶林在南部和混合针叶林/阔叶林在北部。最高海平面在6500-6300 BP左右达到PSL以上2.5-3 m。4700-4500 BP的降温使岛屿植被变化微弱，这与暖流的影响有关.这一时期的大规模海退导致了广泛的沿海沙丘的形成。晚全新世开始时的变暖与全新世最佳期的变暖几乎相似。在4010-3400和2950-2620 BP记录了两次小的海侵。碎屑物质主动进入海岸带，导致堆积地貌的增长。晚全新世后半期植被变化和气候恶化。针叶林和针阔叶混交林向南转移，占据了该岛的大部分地区。在1700-1300 BP的冷却过程中，地峡面积增加，形成了湖泊和海岸沙丘的海岸湿地，并发展了草原和沼泽景观。晚全新世的变暖并不强烈。活跃的风成堆积发生在“小冰期”的冷却和海退过程中。
Natural middle-and late-Holocene environmental development of Kunashiri Island reflects global climatic changes and the migration of warm and cold currents. Dry and cool climate changed to warm and moist about 7000–6500 BP, later than on Hokkaido Island. At this time Kuroshio Current system became more active. On Kunashir Island birch assemblages were replaced by cool-temperate broadleaf forests in the south and mixed coniferous/broadleaf forests in the north. The highest sea-level position reached 2.5–3 m above PSL about 6500–6300 BP. Cooling about 4700–4500 BP island vegetation weakly changed that connected with warm current influence. Major regression at this period led to formation of extensive coastal dunefields. The warming at the beginning of the late Holocene was almost similar to the Holocene Optimum. Two minor transgressions are recorded about 4010–3400 and 2950–2620 BP. Active entrance of detrital material to the coastal zone resulted in growth of accumulative landforms. Vegetation changes and climatic deterioration took place in the second half of the late Holocene. Coniferous and mixed coniferous/broadleaf forests shifted southward and occupied a large part of the island. During cooling at 1700–1300 BP the isthmus area increased, coastal wetlands with lakes and coastal dunes were formed, and grassland and swamp landscapes developed. Late-Holocene warming was not intensive. Active aeolian accumulation took place during the ‘Little Ice Age’ cooling and regression.