摘要:水生植物是维持湖泊生态系统健康发展的重要基础与支撑。与陆地植物相比，水生植物稳定碳同位素（δ¹³C）的分馏过程较复杂，为系统的了解水生植物δ¹³C的分馏过程及其在湖泊现代生态系统和古环境研究中的应用，调研了国内外相关研究进展。总结已有研究表明，水生植物的δ¹³C主要与其吸收利用的碳源和水体环境要素等密切相关，影响因素较复杂，而且目前在利用水生植物的δ¹³C研究不同时间尺度上湖泊环境变化时所选用的载体存在差异。植物不同组分样品的选择对解释水生植物δ¹³C与环境之间的关系至关重要。因此，以太湖典型水生植物为研究实例，探讨了水生植物不同组分稳定碳同位素的分布特征及其对环境因子的响应差异，结果显示水生植物不同组分的δ¹³C存在一定的差异，而且对环境的响应也不同，未来在利用水生植物δ¹³C研究湖泊环境变化时对于水生植物样品组分的选择应谨慎考虑。



Abstract:Aquatic plants are essential for maintaining the diversity and stability of the lake ecosystem. Compared with terrestrial plants, the processes of carbon isotopes (δ¹³C) chemical fractionation in aquatic plants are more complicated. In order to get a comprehensive and systematic understanding of the processes of carbon isotopic fractionation in aquatic plants and its applications in environmental study, the relevant studies were reviewed. This paper introduced the mechanisms of carbon isotope fractionation and its influencing factors. Besides, the application of aquatic plants carbon isotope in lake ecosystems and palaeoenvironments was also summarized. Previous studies indicated that carbon sources utilization and water parameters are key factors affecting the δ¹³C of aquatic plants. And, there are differences in selecting of organic components of plants when using δ¹³C of aquatic plants to study lake environmental changes at different time-space scale. The selection of proper component is crucial for interpreting the relationship between δ¹³C in the aquatic plants and environmental changes. Taking the typical macrophytes in Taihu Lake as an example, we analyzed the values of δ¹³C in different components of macrophytes and its response to environmental changes. The results showed that there was significant difference of δ¹³C among different components of aquatic plants and their response to environmental factors. Therefore, it is necessary to select proper components of aquatic plants for analyzing δ¹³C to study the environment changes in lakes.





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