Pollen distribution in large freshwater lake of arid region: a case study on the surface sediments from Bosten Lake,Xinjiang, China |
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Authors: | Xiaozhong HUANG Gang ZHOU Yanlin MA Qinghai XU Fahu CHEN |
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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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