Quantitative reconstruction of historical aquatic plant evolution based on multi-proxy analysis on lake sediment
Dong Xuhui1, Zhang Qinghui2, Yao Min3, Ge Yawen2, Zhang Yongdong2, Yang Xiangdong2
1. School of Geographical Sciences, Guangzhou University, Guangzhou 510006, Guangdong;
2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, Jiangsu;
3. School of Environment and Planning, Liaocheng University, Liaocheng 252059, Shandong
Aquatic plants are one of the most important components in lake ecosystems. The information on their structure and evolution is essential for understanding lake ecosystems, as well as for their restoration and management. Except for those lakes with instrumental records, it is a great challenge to reconstruct the long-term pattern of aquatic plants in global environmental research. With an overall review on the current progress and approaches in reconstructing aquatic plants history, this paper focuses on a multi-proxy approach based on analysis of lake sediments, including pollen, aquatic plant remain, biomarker and diatom. Taking the Lake Liangzi(30°05'~30°18'N, 114°21'~114°39'E, Hubei Province, China) as an example, we took a 31-cm-long sediment core and examined the sedimentary proxies including 210Pb chronology, diatom and aquatic plant remains. The record on periphytic diatoms and aquatic plant remains were used for evaluating the pros and cons of those proxies in deciphering long-term evolution of aquatic plants, with validation from existing monitoring records on historical aquatic plants. We found that the major species including Potamogeton, Ceratophyllum demersum, Myriophyllum spicatum and Hydrilla verticillata can reflected by both periphytic diatoms and aquatic macrofossils. We thus concluded that aquatic plant remains analysis may be very usefully employed to determine the dominant taxa in past aquatic plant communities of shallow lakes and that the addition of diatom, pollen analysis provides further information on former species richness. For future research, we propose a research scheme including the representativity/autoecology of key species, the combination of neo-and paleo-limnology/ecology and the reconstruction validation by complement of multi-proxies from lake sediment.
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