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《Acta Sedimentologica Sinica》 2001-02
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Effects of Depositional Environment on Pollen Assemblages —A case study in the Shiyang River Basin

ZHU Yan 1,2 CHEN Fa hu 2 ZHANG Jia wu 2 AN Cheng bang 2 1(Northwest Normal University,Department of Geography,Lanzhou 730070) 2(Lanzhou University,Resources and Environment School,Lanzhou 730000)  
The differences of the pollen assemblages of three sites in Shiyang River basin,an internal river system in the arid area of Northwest China,are so sharp that they can't be explained by climatic change.The early to mid Holocene pollen assemblage of Sanjiaocheng section located at the end of Shiyang River basin is dominated by the conifer.The surface samples of a site closed by the Sanjiaocheng Section has over 90% of xeromophte in the pollen assemblages.The pollen in the lower part of Hongshui River Secton is mainly xeric herb.In the upper part of the same section,however,conifer is dominant.Based on the analyses of sedimentary facies,depositional environments and the transportion characteristics of modern pollen,we proposed that the obvious difference of pollen assemblages in the catchment are caused by the differences of depositional environments.As the Sanjiaocheng Section is near to the inlet of Shiyang River to the paleo lake with a semi enclosed environment,the sediments including pollen transported by water from the upper reaches would settle down there.The pollen assemblage,therefore,represents the vegetation of the upper reaches of the drainage.the Hongshui River Section is located near the end of the Hongshui River,a tributary of Shiyang River.The lower part of the section is alluvial sediments indicating an open flowing environment where only a small portion of the pollen carried by water can be kept in the sediments.There is no environmental significance in this pollen assemblage and it can't be used to explain the vegetation.The upper part of the section is lacustrine sediments suggesting an enclosed environment similar to that in Sanjiaocheng Section.The pollen assemblage also reflects the vegetation in the uplands.The prevailing xeromophte in the surface sample near the Sanjiaocheng section implies the local desert vegetation because there is no water to the lowest reaches of the Shiyang River as several reservoirs were built for irrigation in the upper and middle reaches.We have to be very careful when reconstructing or explaining palaeoenvironment with pollen assemblages only.Sedimentary facies and environment should also be given enough consideration as it is useful in judging the origin of pollen in the sediments.
【Fund】: 国家自然科学基金重点项目!(批准号 :49731 0 1 0 );; “973”国家重点基础研究发展规划项目!(G1 990 4 350 1 )资助
【CateGory Index】: Q913.84
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