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首页> 外文期刊>Quaternary International >How did the forest respond to Holocene climate drying at the forest-steppe ecotone in northern China?
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How did the forest respond to Holocene climate drying at the forest-steppe ecotone in northern China?

机译：在中国北方的森林草原过渡带，森林对全新世气候的干燥有何反应？

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摘要

A sediment sequence from Anguli Nuur Lake (41°18'-24'N, 114°20'-27'E) located at the forest-steppe ecotone in the southern Inner Mongolia Plateau of China was selected to reconstruct the Holocene history of vegetation development and to determine the primary driver of forest dynamics. The shifting of vegetation zones was reconstructed by pollen-vegetation zone discriminant functions established by contemporary distribution of surface pollen in a transect along both precipitation and vegetation gradients in northern China. Pollen indicators for human disturbance were selected by comparison with a sediment sequence from West Liao River basin which is also located in the forest-steppe ecotone but is abundant in archeological sites. Changes of coarse sand percentage show great consistency with changes of regional humidity index, suggesting a prominent role of climate in soil erosion. The discriminant functions showed that long-term replacement of the forest zone by steppe zone commenced at 2.1 ka BP. Pollen percentages also show that climate drying since 5.0 ka BP first led to replacement of broadleaf forest by pine forest due to soil coarsening. Further recession of pine forest from this region since 2.1 ka BP was primarily driven by climate deterioration, because no pollen indicator of human disturbance was recognized. The study also suggests an earlier arrival but later recession of pine forest in the study region, implying pine (Pinus tabulaeformis) migrated from the south, and migration of pine forest in the current steppe region was driven by the Pacific monsoon movement.
机译：选取内蒙古高原南部森林草原交错带的安古里努尔湖（41°18'-24'N，114°20'-27'E）的沉积序列重建植被全新世的历史发展并确定森林动力的主要驱动力。植被带的转移是通过花粉-植被带判别函数重建的，而判别函数是当代中国北方样带中沿降水和植被梯度分布的表面花粉分布所建立的。通过与西辽河流域的沉积物序列进行比较，选择了人为干扰的花粉指标，该沉积物序列也位于森林草原过渡带中，但考古遗址中丰富。粗砂含量的变化与区域湿度指数的变化具有很大的一致性，表明气候在土壤侵蚀中具有重要作用。判别函数表明，草原区对森林带的长期替换始于2.1 ka BP。花粉百分比还显示，自5.0 ka BP以来的气候干燥首先由于土壤变粗而导致松林替代阔叶林。自从2.1 ka BP以来，该地区松树林的进一步衰退主要是由于气候恶化所致，因为没有人为干扰的花粉迹象。这项研究还表明，研究区域的松树林较早到达，但随后出现了衰退，这意味着松树（Pinus tabulaeformis）从南方迁移，而当前草原地区的松树林的迁移是由太平洋季风运动驱动的。

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  • 来源
    《Quaternary International》 |2010年第1期|p.46-52|共7页
  • 作者

    Hongyan Liu; Yi Yin; Jiangling Zhu; Fengjun Zhao; Hongya Wang;

  • 作者单位

    College of Urban and Environmental Sciences and MOE Laboratory for Earth Surface Processes, Peking University, Beijing 100871, PR China;

    rnCollege of Urban and Environmental Sciences and MOE Laboratory for Earth Surface Processes, Peking University, Beijing 100871, PR China;

    rnCollege of Urban and Environmental Sciences and MOE Laboratory for Earth Surface Processes, Peking University, Beijing 100871, PR China;

    rnCollege of Urban and Environmental Sciences and MOE Laboratory for Earth Surface Processes, Peking University, Beijing 100871, PR China;

    rnCollege of Urban and Environmental Sciences and MOE Laboratory for Earth Surface Processes, Peking University, Beijing 100871, PR China;

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