...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Asian earth sciences >Vegetation history and environment changes since MIS 5 recorded by pollen assemblages in sediments from the western Bohai Sea, Northern China
【24h】

Vegetation history and environment changes since MIS 5 recorded by pollen assemblages in sediments from the western Bohai Sea, Northern China

机译：自MIS 5以来渤海西部沉积物中花粉组合记录的植被历史和环境变化。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Due to the lack of well-constrained chronology, the history of climate and vegetation associated with sea level changes during the late Quaternary has been poorly understood in the Bohai sea area. In this study, the upper 56.0 m-long sediment of the TJC-1 core in the western Bohai Sea was investigated using pollen and spore analyses, together with OSL, AMS C-14 dating, grain size, and foraminifera data. The chronologically well-constrained core records show that varying pollen and spore assemblages reflect changes in vegetation on the adjacent land, climate and sediment settings since MIS 5 stage. Arboreal pollen dominated by Pinus and Quercus generally prevailed during the warm periods (MIS 5a, 5c, 5e, MIS 3 and MIS 1), corresponding to the sea level highstands, while dominance of terrestrial herbs such as Artemisia and Chenopodiaceae indicate presence of grasslands during cold periods such as MIS 4, MIS 5b and 5d when sea level dropped significantly. During the stadial periods such as MIS 5b and MIS 5d, herbaceous assemblages predominated in relatively cold conditions, in response to fluvial and coastal high energy sedimentary environments. The dominance of herbs especially Chenopodiaceae in the early-middle of MIS 5 and early Holocene was probably associated with huge amounts of sandy sediments input from the Yellow River caused by strong rainfall. Furthermore, pollen concentration is closely related to sediment grain size, arboreal pollen and fern spores are especially deposited in the fine sediment while herbaceous pollen dominates in coarser sediment.
机译：由于缺乏严格的时间顺序，渤海地区对第四纪晚期与海平面变化有关的气候和植被的历史了解甚少。在这项研究中，使用花粉和孢子分析，以及OSL，AMS C-14年代，晶粒大小和有孔虫数据，调查了渤海西部TJC-1岩心上部56.0 m长的沉积物。按时间顺序排列的核心记录表明，自MIS 5阶段以来，不同的花粉和孢子组合反映了邻近土地，气候和沉积物设置下的植被变化。在温暖的时期（MIS 5a，5c，5e，MIS 3和MIS 1），普遍存在着以松属和栎属为主的乔木花粉，对应于海平面高点，而蒿类和藜科等陆生草本植物的优势表明在此期间存在草场。海平面明显下降时的寒冷时期，例如MIS 4，MIS 5b和5d。在诸如MIS 5b和MIS 5d之类的静止时期，响应于河流和沿海高能沉积环境，草本组合在相对寒冷的条件下占主导地位。 MIS 5中早期和全新世初期，草药尤其是藜科的优势可能与大量降雨导致黄河输入大量沙质沉积物有关。此外，花粉浓度与沉积物粒径密切相关，乔木花粉和蕨类孢子尤其沉积在精细沉积物中，而草本花粉在较粗的沉积物中占主导。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号