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The environmental signal of an early Holocene pollen record from the Shiyang River basin lake sediments, NW china

Chinese Science Bulletin 2002年第4期47卷 267-273页

作者： zhu yan, chen fahu & madsen davidcollege of geography and environment, northwest normal university, lanzhou 730070, china National Key Laboratory of West environmental System, lanzhou university, lanzhou 730000, china Utah Geological Surv College of geography and environment Northwest Normal University Lanzhou China National Key Laboratory of West environmental System Lanzhou University Lanzhou China Utah Geological Survey Utah USA

Pollen analyses of 85 samples from the San-jiaocheng section well along the margin of a palaeolake at the end of the Shiyang River, NW china, show that Picea and Sabina dominate the pollen assemblage. Together they reach as high as 40%-60%, with the percentage of Picea varying inversely with that of Sabina. Similar results were obtained from another section in the Shiyang River drainage. Using modern ecological habitat relationship analogues, pol-len transport characteristics, and the overall pollen assem-blage, we propose that both Picea and Sabina pollen were transported by the river from the mountains at the upper reaches of the Shiyang River, and that the assemblage is more indicative of changes in upland vegetation than of local conditions near the section. This interpretation is supported by pollen data derived from surface samples, water samples, and riverbed samples. Using a moisture indicator (the Picea to Sabina ratio) and calculated pollen concentrations, we identify a series of

关键词： NW china The environmental signal of an early Holocene pollen record from the Shiyang River basin lake sediments

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