魏海成, 马海州, 郑卓, 潘安定, 黄康有, 王志英, 翟俊. 青藏高原东北部表土花粉组合与植被和气候的关系[J]. 海洋地质与第四纪地质, 2010, 30(4): 187-192. DOI: 10.3724/SP.J.1140.2010.04187
引用本文: 魏海成, 马海州, 郑卓, 潘安定, 黄康有, 王志英, 翟俊. 青藏高原东北部表土花粉组合与植被和气候的关系[J]. 海洋地质与第四纪地质, 2010, 30(4): 187-192. DOI: 10.3724/SP.J.1140.2010.04187
WEI Haicheng, MA Haizhou, ZHENG Zhuo, PAN Anding, HUANG Kangyou, WANG Zhiying, ZHAI Jun. CHARACTERISTICS OF POLLEN ASSEMBLAGES OF SURFACE SAMPLES FROM THE NORTH-EASTERN TIBETAN PLATEAU AND THEIR IMPLICATIONS FOR VEGETATION AND CLIMATE[J]. Marine Geology & Quaternary Geology, 2010, 30(4): 187-192. DOI: 10.3724/SP.J.1140.2010.04187
Citation: WEI Haicheng, MA Haizhou, ZHENG Zhuo, PAN Anding, HUANG Kangyou, WANG Zhiying, ZHAI Jun. CHARACTERISTICS OF POLLEN ASSEMBLAGES OF SURFACE SAMPLES FROM THE NORTH-EASTERN TIBETAN PLATEAU AND THEIR IMPLICATIONS FOR VEGETATION AND CLIMATE[J]. Marine Geology & Quaternary Geology, 2010, 30(4): 187-192. DOI: 10.3724/SP.J.1140.2010.04187

青藏高原东北部表土花粉组合与植被和气候的关系

CHARACTERISTICS OF POLLEN ASSEMBLAGES OF SURFACE SAMPLES FROM THE NORTH-EASTERN TIBETAN PLATEAU AND THEIR IMPLICATIONS FOR VEGETATION AND CLIMATE

  • 摘要: 对青藏高原东北部地区65样点进行了植被调查与表土花粉分析,样品取自于6种类型的植被带内,包括森林、高山灌丛、高山草甸、温带草原、荒漠草原、灌木半灌木荒漠。结果显示:青藏高原东北部地区花粉组合能较好地反映主要的植被群落特征。蒿藜比值(A/C)对该区域多年平均降水量(MAP)十分敏感,A/C值从高山灌丛草甸、温带草原到荒漠灌丛带呈逐渐降低趋势。DCA排序分析结果显示:该地区表土花粉能很好地反映相应植被群落特征,表土花粉分布与多年平均降水量(MAP)呈显著相关,与7月平均温度呈负相关关系。该研究为青海湖及柴达木盆地湖泊沉积物花粉分析定量重建古气候、古环境提供了很好的理论基础。

     

    Abstract: 65 soil samples from north-eastern Tibetan Plateau, northwest China (94.17°E~102.37°E,35.72 °N~38.05°N), were analyzed for pollen content. The pollen belong to six main vegetation types:forest, alpine shrubs, alpine meadows, temperate steppes, steppe deserts, shrub and semi-shrub deserts. The aim of this study is to provide new data on the modern pollen rain in the semi-arid to arid areas of northwest China.These data were interpreted by using diagrams of pollen percentages and numerical analyses. Our result shows that the present major vegetation communities in Qinghai area can be well defined by their pollen assemblages.Artemisia/Chenopodiaceae(A/C)ratio is sensitive to mean annual precipitation (MAP).It decreases from the alpine shrub and alpine meadow zone, through the temperate steppe, to the shrub and semi-shrub desert zone. Detrended correspondence analyses indicate that pollen assemblages have obvious relationship with the mean annual precipitation (MAP) and the July mean annual temperature (July Temp). This study also provides the theoretical basis for quantitative reconstructions of palaeoclimate and palaeovegetation based on fossil pollen spectra from the lacustrine sediments of the Qinghai Lake and Qaidam basin.

     

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