Multiple Effects of Environmental Factors on Algal Growth and Nutrient Thresholds for Harmful Algal Blooms: Application of Response Surface Methodology

摘要: Systematic understanding of the co-effects environmental factors on phytoplankton proliferation can enable more effective control harmful algal blooms in eutrophic lakes and reservoirs. A batch statistically designed experiments using response surface methodology was recently conducted mixed algae samples collected from Changtan Reservoir. The central composite model established to evaluate multiple effects various physical chemical (total nitrogen, total phosphorus, temperature, light intensity) density chlorophyll a content. Analysis variance indicated an excellent correlation between modeling results experimental responses. Among selected variables, promotion interactive nitrogen phosphorus together with optimum nitrogen/phosphorus mass ratio (between 7.9 10.1) determined be most significant stimulating parameter associated blooming development dominated by non-nitrogen-fixing species. favorable strong illumination were shown greater than those high temperature. border values concentrations leading critical value under different water temperatures intensities could predicted as nutrient loading thresholds for our second-order polynomial regression model.