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Microcosm Studies on Anaerobic Phosphate Flux and Mineralization of Lake Sediment Organic Carbon

^a Soil and Environment Bioremediation Research Center, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008, China
^b Agricultural and Environmental Science Department, Queen's University Belfast, Newforge Lane, Belfast BT9 5PX, UK

View larger version (15K): [in a new window]   Fig. 1. Schematic diagram of the microcosm used in the laboratory simulation study. ORP, oxidation–reduction potential; SMS, soil moisture sampler.

View larger version (15K): [in a new window]   Fig. 2. Temporal changes in sediment redox potential (Eh) and pH during anaerobic incubation.

View larger version (16K): [in a new window]   Fig. 3. Temporal changes in soluble phosphorus concentration in overlying water and sediment porewater. Bars indicate ±1 SE (n = 4).

View larger version (17K): [in a new window]   Fig. 4. Temporal changes in dissolved organic carbon (DOC) concentration in overlying water and sediment porewater. Bars indicate ±1 SE (n = 4).

View larger version (17K): [in a new window]   Fig. 5. Total carbon mineralized in West Lake sediment under anaerobic conditions expressed as CH4, CH4 + DOC(OW), or CH4 + DOC(OW) + DOC(SP), where DOC is dissolved organic carbon, OW is overlying water, and SP is sediment porewater. Bars indicate ±1 SE (n = 4).