对格尔木河流域进行了植被样方调查及表土、河流冲积物表层花粉分析,结果显示该流域表土花粉能较好地反映样方植被群落特征,河流冲积物样点中,上游段花粉组合以藜科、麻黄科、蒿属为主,反映了该段植被带的整体面貌;中下游段样点花粉组合中禾本科、莎草科占绝对优势,反映河道周围湿生草地植被带特征.主成分分析(PCA)显示,前两个因子轴能很好地区分高寒灌丛草甸带、矮半灌木荒漠带和湿生草地样点.%This study explored the relationship between pollen and vegetation in the Golmud River drainage, an internal river system in Qaidam basin,Northeastern Tibetan Plateau. Modern surface samples were collected from Golmud River drainage, vegetation survey were conducted simultaneously where pollen samples were collected. Alluvial pollen samples were collected from fresh sediments in the riverbed. Our result shows that the major vegetation communities occurring today in Golmud River drainage can be well differentiated by their surface pollen assemblages. We found that pollen assemblages from alluvial deposits of the up reaches identified as Chenopodiaceae + Ephedra + Artemisia, and it were reflected the characteristic of whole vegetation zones. Pollen assemblages of the middle and lower reaches were identified as Poaeceae + Cyperaceae, and it were reflected the wetland vegetation of river basin, Principal Component Analysis( PCA) indicate that the first two axes captured 73. 8% of the total variance,tile first two principal component separates the samples from meadow steppe,semi-shrub deserts and wetland.
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