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首页> 外文期刊>Global and planetary change >Sensitive response of desert vegetation to moisture change based on a near-annual resolution pollen record from Gahai Lake in the Qaidam Basin, northwest China
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Sensitive response of desert vegetation to moisture change based on a near-annual resolution pollen record from Gahai Lake in the Qaidam Basin, northwest China

机译：基于柴达木盆地Ga海的近年分辨率花粉记录，沙漠植被对水分变化的敏感响应

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摘要

We present a 50-year pollen record at near-annual resolution from Gahai Lake in the Qaidam Basin on the northeastern Tibetan Plateau. Chronology of a 22-cm short core was established by ~(210)Pb and ~(137)Cs analysis. The pollen results at 0.5 cm intervals show large changes in Artemisia/Chenopodiaceae (A/C) ratios from <0.2 to 0.95 in the last 50 years. High (low) A/C ratios represent increase (decrease) in steppe pollen production, which correspond to high (low) relative humidity observed at nearby Delingha weather station. On the basis of good correspondence with instrumental records and carbonate content from Gahai Lake, we conclude that A/C ratio is sensitive to moisture change and can be a very useful index in reconstructing paleoclimate of arid regions. Comparison with pollen and snow accumulation data from Dunde ice core suggests that effective moisture at low and high elevations shows the opposite relationship when mountain precipitation was extremely high, possibly due to topography-induced uplifting and subsiding air dynamics.
机译：我们以近年分辨率提出了来自青藏高原东北部柴达木盆地盖海的50年花粉记录。通过〜（210）Pb和〜（137）Cs分析建立了22厘米短芯的年代学。在过去50年中，每0.5厘米间隔一次的花粉结果显示，蒿/藜科（A / C）的比例从<0.2到0.95有很大变化。高（低）A / C比表示草原花粉产量增加（减少），这与在附近的德令哈气象站观察到的高（低）相对湿度相对应。根据与Ga海仪器记录和碳酸盐含量的良好对应关系，我们得出结论，A / C比对水分变化敏感，可以作为重建干旱地区古气候的非常有用的指标。与来自邓德冰芯的花粉和积雪数据的比较表明，当山区降水极高时，低海拔和高海拔的有效水分显示出相反的关系，这可能是由于地形引起的隆升和沉降空气动力学所致。

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