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Spatiotemporal variations of internal P-loading and the related mechanisms in the large shallow Lake Chaohu

Science China Earth Sciences 2006年第z1期49卷 72-81页

作者： ZHANG Min XIE Ping XU Jun LIU Bingqin YANG Hong Donghu Ecosystem Experimental Station of Lake Ecosystems State Key Laboratory of Freshwater Ecology and Biotechnology of ChinaInstitute of HydrobiologyChinese Academy of SciencesWuhan 430072China

Spatiotemporal variations of P species and adsorption behavior in water column,interstitial water,and sediments were investigated in the large shallow eutrophic Lake ***(Ortho-P)and total phosphorus(TP)concentrations were significantly higher in the western part than in the eastern part of the lake,due to different nutrient inputs from the surrounding ***,particulate phosphorus(PP)concentration was in a similar spatial pattern to Ortho-P and TP concentrations,and also showed significantly positive correlation with the biomass of Microcystis,indicating more uptake and store of phosphorus by Microcystis than by other *** of pH and intensive utilization of P by phytoplankton were the main factors promoting P(especially Fe-P)release from the sediment to interstitial water during the cyanobacterial blooms.in Lake *** dynamics in TP concentration,P species and adsorption behavior of the sediment,coupled with the statistical analyses,suggested that the spatial heterogeneity of P contents in the sediment was influenced by various factors,*** activities,soil geochemistry and mineral *** spite of similar TP contents in the sediments,increase in proportion of Fe-P concentration in the sediment may result in a high risk of P release.

关键词： eutrophication water column sediment phosphorus species sorption and release Lake Chaohu cyanobacterial blooms.

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