J Integr Plant Biol. ›› 2002, Vol. 44 ›› Issue (3): 367-372.

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Pollen Assemblage Features of Modern Water Samples from the Shiyang River Drainage, Arid Region of China

ZHU Yan   

Abstract:

Pollen analysis of 30 modern water samples from the Shiyang River, aninternal river system located between the Tengger and Badain Jaran deserts, Northwest China was carried out to examine the river's capacity to carry pollen and spores, and to assess the contribution of the water borne pollen to pollen assemblages in lake sediments at the end of the river system. Results indicate the pollen assemblages in water samples consist of both local and upland pollen. Percentages of upland pollen reach 30%-60%, and pollen assemblages in water samples do not indicate the nature of local vegetation at the sampling sites. Fluvial currents have the capacity to transport large quantities of pollen long distances, and the contribution of this fluvial transported pollen is relatively high. For example, percentages of Picea Dietr. pollen in water samples at sampling sites 130 km and 145 km away from Picea forests reach 16.5% and 7.7%, respectively. Fluvial pollen transport occurs primarily during flood periods, and pollen concentrations from the flood samples are 17.1-12.5 times those from normal fluvial flow. Reservoirs affect pollen transportation since pollen is deposited at reservoir inlets and pollen concentrations are much reduced at reservoir outlets. Human activity can thus change natural features of pollen transportation and deposition. The main factors influencing pollen concentrations and assemblages are sampling time, sampling location, and rainfall intensity.

干旱区石羊河流域河水孢粉组合特征

朱艳1,2  陈发虎1,3  程波1  张家武1  David B MADSEN1,4

(1.兰州大学西部环境教育部重点实验室,兰州,7300002.西北师范大学地理与环境科学学院,兰州,7300703.兰州大学干旱农业国家重点实验室,兰州,730000; 4. Uath,Geological,Survey,Salt,Lake,City,Uath,84114,USA)

摘要:石羊河流域初春和仲夏两季不同地点,洪水期、平水期30个河水样孢粉分析显示, 没有人类影响的情况下,河水样孢粉组合是由河流上游径流区的植物孢粉和采样点附近植被孢粉组成的,前者在孢粉组合中至少占30%60%.河水搬运孢粉的能力非常强,可长距离、大量地搬运孢粉.孢粉组合中河水贡献孢粉的含量较高,:云杉属(Picea Dietr.)花粉河水的贡献率在中下游可达16.5%7.7%.采样时间、地点影响河水的孢粉组合和浓度,洪水期是孢粉搬运的主要时期.河水经过水库后,其中孢粉绝大多数沉积在水库中.

关键词 孢粉分析 现代河水 石羊河 干旱区

 

Key words: pollen analysis, modern river water, Shiyang River, arid region of China

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