Abstract
Carbon (C) and silicon (Si) are essential lake ecosystem components, impacting both phytoplankton growth and other available elements and nutrients. In this study, we selected a typical floodplain-lake system to explore the seasonal role of coupled C and Si as matter is imported and exported through lotic water processes. Results showed considerably higher dissolved inorganic carbon (DIC), dissolved organic carbon (DOC), and dissolved total carbon (DTC) concentrations during the transitional stage between the dry and wet season (here referred to as TDW) compared to the other seasonal stages (5.81 mg/L–28.80 mg/L), indicating that imported runoff significantly effects the transport of C and Si. Rock weathering was the main source of dissolved silicon (DSi). The dilution effect and water temperature may also impact DIC, DOC, and DTC concentrations. Except for the wet season, Bacillariophyta was the dominant phytoplankton taxon, and diatom growth as well as the growth of other algae taxon may influence DSi and DTC concentrations through several biochemical processes. This study describes effects of coupled C and Si and highlights variation in environmental variables driven by the resident phytoplankton communities in a lake ecosystem.
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