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Pollen distribution in large freshwater lake
of arid region: a case study on the surface sediments from Bosten
Lake, Xinjiang, China |
| Xiaozhong HUANG1,Gang ZHOU1,Yanlin MA1,Fahu CHEN1,Qinghai XU2, |
| 1.CAEP and Key Laboratory
of Western China’s Environmental System, Ministry of Education,
Lanzhou University, Lanzhou 730000, China; 2.CAEP and Key Laboratory
of Western China’s Environmental System, Ministry of Education,
Lanzhou University, Lanzhou 730000, China；College of Resources
and Enrironment Science, Hebei Normal University, Shijiazhuang 050016,
China; |
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Abstract The interpretation of the pollen records from lake sediments is always hampered by a lack of information relating to different pollen production, transportation, deposition, and preservation. It is important to understand the modern process of pollen sedimentation and its climatic implications. This paper presents results from a palynological study on 61 surface sediments samples from Bosten Lake, the largest inland freshwater lake in China. Our results suggest that Chenopodiaceae and Artemisia dominate the modern pollen assemblages and have stable percentages at most sites of the lake basin except for the estuary area. Pollen Artemisia/Chenopodiaceae ratio is about 0.5, indicating the dry climate of the region. Principle Components Analysis (PCA) of pollen data can identify the pollen samples as several ecological groups from different parts of the lake. Pollen transportation dynamics and the mixing effect of lake currents and waves on pollen deposition have affected the pollen assemblages. The distribution of Typha pollen seems to be affected by the location where the parent plants grow. Picea pollen has higher percentages at estuary area, suggesting fluvial transport. Pollen concentration has high values at the central part of the lake basin due to the sedimentation focusing process effect. Our results suggest that the pollen assemblages of the sediment core from the central part of the lake can potentially record the regional vegetation history.
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| Keywords
Bosten Lake
surface sediments
pollen analysis
sedimentation focusing
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Issue Date: 05 June 2010
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