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首页> 美国卫生研究院文献>other >Pollen-based reconstruction of vegetational and climatic change over the past ~30 ka at Shudu Lake in the Hengduan Mountains of Yunnan southwestern China
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Pollen-based reconstruction of vegetational and climatic change over the past ~30 ka at Shudu Lake in the Hengduan Mountains of Yunnan southwestern China

机译：中国西南地区云南横断山蜀渡湖过去30ka以来基于花粉的植被和气候变化重建

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The Hengduan Mountains, with a distinct altitudinal differentiation and strong vertical vegetation zonation, occupy an important position in southwestern China as a global hotspot of biodiversity. Pollen analysis of lake sediments sampled along an altitudinal gradient in this region helps us to understand how this vegetation zonation arose and how it has responded to climate change and human impacts through time. Here we present a ~30-ka pollen record and interpret it in terms of vegetational and climatic change from a 310 cm-long core from Shudu Lake, located in the Hengduan Mountains region. Our results suggest that from 30 to 22 cal. ka BP, the vegetation was dominated by steppe/grassland (comprising mainly Artemisia, Poaceae and Polygonaceae) and broad-leaved forest (primarily Quercus, Betula and Castanopsis) in the lake catchment, reflecting a relatively warm, wet climate early in this phase and slightly warmer, drier conditions late in the phase. The period between 22 and 13.9 cal. ka BP was marked by a large expansion of needle- and broad-leaved mixed forest (Pinus, Abies and Quercus) and a decline in the extent of steppe/grassland, indicating warming, drying climatic conditions followed by a cold, wet period. Between 13.9 and 3 cal. ka BP, steppe/grassland expanded and the area covered by needle- and broad-leaved mixed forest reduced, implying a fluctuating climate dominated by warm and humid conditions. After 3 cal. ka BP, the vegetation was characterized by an increase in needle-leaved forest and reduction in steppe/grassland, suggesting warming and drying climate. A synthesis of palynological investigations from this and other sites suggests that the vegetation succession patterns seen along an altitudinal gradient in northwestern Yunnan since the Late Pleistocene are comparable, but that each site has its own characteristics probably due to the influences of altitude, topography, microclimate and human impact.
机译：横断山脉海拔高度明显不同，垂直植被带强烈，在西南地区作为全球生物多样性热点地区占有重要地位。对沿该地区的海拔梯度采样的湖泊沉积物进行花粉分析有助于我们了解这种植被带的产生方式以及它如何对气候变化和人类影响产生长期影响。在这里，我们介绍了一个约30-ka的花粉记录，并根据横断山脉地区舒杜湖310厘米长的岩心对植被和气候变化的解释。我们的结果表明，从30到22 cal。 ka BP，植被主要由湖泊流域的草原/草地（主要包括蒿，禾本科和Poly科）和阔叶林（主要是栎属，桦属和Cast属）组成，这反映了该阶段初期的相对温暖湿润的气候，以及在该阶段后期，天气略温暖，干燥。 22至13.9 cal之间的时间段。 ka BP的特征是针叶和阔叶混交林（松，冷杉和栎）的大面积扩张和草原/草原的减少，这表明气候变暖，干燥，气候条件潮湿。在13.9至3卡之间。 ka BP，草原/草原扩大，针叶和阔叶混交林覆盖的面积减少，这意味着以温暖和潮湿为主的气候波动。 3卡路里后。 ka BP，植被的特征是针叶林的增加和草原/草地的减少，表明气候变暖和干燥。从该地点和其他地点进行的孢粉学调查的综合结果表明，自晚更新世以来沿云南西北部的海拔梯度观察到的植被演替模式具有可比性，但是每个地点都有其自身的特征，这可能是由于海拔，地形和微气候的影响和人类的影响。

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