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首页> 外文期刊>The holocene >Vegetation history and dynamics in the middle reach of the Yangtze River during the last 1500 years revealed by sedimentary records from Taibai Lake, China
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Vegetation history and dynamics in the middle reach of the Yangtze River during the last 1500 years revealed by sedimentary records from Taibai Lake, China

机译：中国太白湖的沉积记录揭示了长江中游近1500年的植被历史和动力学

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摘要

Pollen and charcoal records of a 150 cm long lake sediment core from Taibai Lake in the middle reach of the Yangtze River reveal seven major changes in regional vegetation over the last 1500 years. During the period C. ad 480-710, evergreen broadleaved forest dominated by CastanopsislLithocarpus and evergreen oaks occurred in the Taibai Lake catchment. From C. ad 710 to 1050, the vegetation shifted to a mixed conifer and broadleaved forest, with Pinus expanding at the expense of Castanopsis/Lithocarpus. Between C. ad 1050 and 1320, evergreen broadleaved forest reoccupied the studied area. From C. ad 1320 to 1650, the area of primary forest decreased markedly with synchronous reduction in broadleaved trees and Pinus. Between C. ad 1650 and 1740, the biomass declined rapidly, while secondary Pinus forest began to expand. During C. ad 1740-1950, forest extent increased slightly compared with the previous stage, but the landscape was still secondary forest with the minimum proportion of broadleaved trees. After C. ad 1950, the biomass in the surrounding area was very low, with vegetation types similar to that at present (secondary Pinus forest and mixed conifer and broadleaved forest). A detrended correspondence analysis (DCA) with 125 samples and 34 main pollen types is used to separate human and climatic impacts on vegetation. Then, the pollen assemblage, DCA, charcoal record, and magnetic susceptibility are combined to discuss the key factors inducing these vegetation changes. The vegetation changes were mainly controlled by the climatic changes, with the weak impacts of human activities before C. ad 1320. Since then, the intensity of human influences on vegetation increased gradually, entering a transitional period of main controlling factors of vegetation changes from nature to human activities. After C. ad 1740, the vegetation changes were chiefly controlled by human activities, and the climatic signal was weak.
机译：长江中游太白湖150厘米长的湖泊沉积物芯的花粉和木炭记录揭示了过去1500年中区域植被的七个主要变化。在公元480年至710年期间，太白湖流域发生了以CastanopsislLithocarpus和常绿橡树为主的常绿阔叶林。从C. ad 710到1050，植被转变为针叶树和阔叶混交林，而Pinus则以Castanopsis / Lithocarpus为代价进行扩张。在公元1050年至1320年之间，常绿阔叶林重新占据了研究区域。从公元1320年到1650年，原始森林的面积显着减少，而阔叶树和松树的同步减少。在公元1650年至1740年之间，生物量迅速下降，而次生松林开始扩张。在公元1740-1950年期间，森林面积与上一阶段相比略有增加，但景观仍是次生林，阔叶树的比例最小。 1950年后，周围地区的生物量非常低，植被类型与目前相似（次生松林，针叶树和阔叶混交林）。用125种样本和34种主要花粉类型进行去趋势对应分析（DCA），以区分人类和气候对植被的影响。然后，将花粉组合，DCA，木炭记录和磁化率结合起来，讨论引起这些植被变化的关键因素。植被的变化主要受气候变化的控制，在C. ad 1320之前人类活动的影响较弱。此后，人类对植被的影响强度逐渐增加，进入了植被变化的主要控制因素从自然过渡的过渡时期。人类活动。公元1740年后，植被变化主要受人类活动控制，气候信号微弱。

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  • 来源
    《The holocene》 |2013年第1期|57-67|共11页
  • 作者

    Xiayun Xiao; Xiangdong Yang; Ji Shen; Sumin Wang; Bin Xue; Xiufang Tong;

  • 作者单位

    State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences (NIGLAS), 73 East Beijing Road, Nanjing 210008, P.R. China;

    State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences (NIGLAS),China;

    State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences (NIGLAS),China;

    State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences (NIGLAS),China;

    State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences (NIGLAS),China;

    State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences (NIGLAS),China;

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  • 正文语种 eng
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  • 关键词

    charcoal; climate change; human impact; late Holocene; pollen; Taibai Lake;

    机译：木炭;气候变化;人为影响;全新世晚期花粉;太白湖;

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