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Silica in Lakes: Nutrient Competition, Equilibrium Reactions in Sediment Pore Waters, and Role in Metal Cycling

机译:湖泊中的二氧化硅:营养竞争,沉积物孔隙水中的平衡反应以及金属循环中的作用

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The nutrient uptake and growth kinetics of a freshwater diatom (Asterionella formosa) and the blue-green alga (Microcystis aeruginosa) under P or Si limitation were determined in batch culture at 20 C. Asterionella had a higher maximum growth rate and a lower half saturation constant for growth than Microcystis under P limitation. The maximum uptake velocity for P was higher for Asterionella than for Microcystis while the half-saturation constants for P uptake were similar for the two species. Concentrations of dissolved silicon, iron and aluminum were measured in the hypolimnetic and sediment pore waters of several Wisconsin lakes representing a range from high to low silicon concentration. Corresponding measurements of pH and temperature were also made. Equilibrium expressions were developed for various Al-Si, Fe-Si, and Fe-Al-Si phases.

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