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Connecting sources, fractions and algal availability of sediment phosphorus in shallow lakes:An approach to the criteria for sediment phosphorus concentrations

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Journal of Environmental Sciences 2023年第3期125卷 798-810页

作者： Jin Zhang Shijiao Buyang Qitao Yi peiyao Deng Wei Huang Cheng Chen Wenqing Shi School of Civil Engineering Yantai UniversityYantai 264005China School of Earth and Environment Anhui University of Science and TechnologyHuainan 232001China Nanjing Institute of Geography&Limnology Chinese Academy of SciencesNanjing 210008China Center for Eco-Environmental Research Nanjing Hydraulic Research InstituteNanjing 210098China School of Environmental Science and Engineering Nanjing University of Information Science&TechnologyNanjing 210044China

Although point and nonpoint sources contribute roughly equal nutrient loads to lakes,their relative role in supporting algae growth has not been clarified. In this research, we have established a quantitative relationship between algae-available phosphorus(p) and p chemical fractions in sediments;the latter indicates the relative contribution of point versus nonpoint sources. Surface sediments from three large shallow lakes in eastern China, namely, the Chaohu, Taihu and Hongzehu Lakes, were sampled to assess their algaeavailable p and chemically extracted p fractions. The algae-available p primarily comes from iron/aluminium(hydr)oxide-bound p(Fe/Al-bound p), 45% of which is algae-available p. The ratio of Fe/Al-bound p to calcium compound-bound p(Ca-bound p) indicated the relative contribution of point to nonpoint sources, with the point sources contributing the majority of increased Fe/Al-bound p in sediments. Therefore, the reduction of point sources from urbanized areas, rather than nonpoint sources from agricultural areas that primarily contribute to the Ca-bound p fraction, should be prioritized to alleviate cyanobacterial algal blooms(CyanoHABs) in shallow lakes with sediment p as a potential source to support algae growth. With these important results, we proposed a conceptual model for “p-pumping suction” from sediments to algae to aid in the development of the criteria for sediment p concentrations in shallow lakes.

关键词： Algae-available phosphorus Bioassay phosphorous fractionation Eutrophication criteria for sediment p concentrations

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