Abstract：Algae-inhibiting effects of 13 allelochemicals on Microcystis aeruginosa were evaluated in terms of efficiency, dosage, efficient time, duration and cost. Alkaloids were the category of allelochemicals that showed maximum growth inhibition (>80%) on M. aeruginosa, being 4~52 times higher than those of phenolic acids, fatty acids and esters. Alkaloids also showed longer inhibitory duration on M. aeruginosa than other allelochemicals. Among alkaloids, sanguinarine was the one that showed maximum total inhibitory efficiency (>90%) but lowest specific inhibitory efficiency[11%/(mg/L)] which was only 16%, 49% and 63% of that of chelerythrine, gramine and berberine. Chelerythrine was the alkaloid that is most sensitive for inhibiting M. aeruginosa, with the efficient dosage being 0.2mg/L, the efficient time being 0.4d, and the duration longer than 7d (under 2mg/L). The evaluation of cost-efficiency for alkaloids demonstrated that sanguinarine and chelerythrine were less cost-efficient with the cost being 800 times higher than those of gramine and berberine. A comprehensive comparison demonstrated that the allelochemicals followed an order of chelerythrine, berberine, sanguinarine and gramine based on the inhibitory properties, and followed an order of nonanoic acid, gramine, berberine and PHBA based on the cost-efficiency.
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