Abstract
The grain size of lake sediments has been widely used to reconstruct environmental processes. However, the various components of lake sediments are influenced by different factors, and therefore the environmental significance of grain-size variations may be complex. For example, in situ authigenic biological siliceous components cannot be used to indicate variations in hydrodynamic conditions. Here we present a case study of the effects of diatoms on the grain size of the sediments of Lake Kanas in NW China. The analyses consist of measurements of bulk sediment grain size and biogenic silica, together with microscope observations. Based on both light and scanning electronic microscope observations, two large diatom species, Campylodiscus hibernicus Ehrenberg and Ellerbeckia arenaria (Moore) Crawford, were found to be abundant in sediment samples with a large bulk-sediment grain size, and they contributed substantially to the biogenic silica content and the measured bulk sediment grain size of the core. A quantitative assessment of the effects on grain size was made, and the study has a broad significance for evaluating the effects of diatoms on sediment grain-size distributions in other lakes. Because diatoms may deposit in situ or could be transported differently from other clastic material, the explanation of hydrodynamics could be misled if the influence of diatom has not been excluded. Therefore, we suggest BSi content should be tested to assess the diatom effect prior to grain-size analysis of lake sediments, together with microscope check of diatoms if BSi content is higher than 10%.
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Acknowledgements
This study was funded by the National Key Research and Development Program of China (Awards 2017YFA0603402 and 2017YFA0603403) and the National Natural Science Foundation of China (Award 41571182). We thank Prof. Thomas J. Whitmore, Prof. Irene Gregory-Eaves and two anonymous reviewers for their helpful suggestions for improving the paper. We also thank W. Peng for help with fieldwork; Dr. Selvaraj Kandasamy for providing guidance in the laboratory; and L. Wang, Z.Q. Wang, Q.Q. Liu and H.W. Wang for their assistance with the biogenic silica measurements.
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Huang, X., Sun, M., Xiang, L. et al. The effect of diatoms on the grain size of lake sediments: a case study of the sediments of Lake Kanas. J Paleolimnol 63, 101–111 (2020). https://doi.org/10.1007/s10933-019-00104-1
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DOI: https://doi.org/10.1007/s10933-019-00104-1