Effects of nutrients on Microcystis growth more easily forming bloom

Abstract： Different nutrient media experimentally were N, P and Fe-limited conditions and a serial of diluted BG11 media. The cell change of morphology and life history, cell number, cell color and cell area of Microcystis were analyzed quantitatively. First, the effects of nitrogen, phosphorus and iron depletion were distinctively different. Phosphorus and iron depletion caused more special division cells, slowly growth increasing, the easier change of bigger cell area. Second, the nitrogen and iron depletion could make the color of alga from green to brown. Finally, according to the resource competition and Monod equation, Microcystis kinetics of phosphorus and iron were also examined. Ks and μmax of phosphorus absorption were 0.0352 μmol/L, 0.493 d-1 respectively; iron absorption: 0.00323 μmol/L, 0.483 d-1. In a word, some evidences of the Microcystis bloom privilege in certain nutrient conditions were indicated in the experiments. The privileges were determined as the reviving under the adverse circumstances through the special division, the various nitrogen resources, and the lower kinetics of phosphorus and iron than that of most of other algae. The conclusions provided the scientific basis for preventing and managing Microcystis bloom in freshwater. 作 者： OU Ming-ming    ZHOU Bao-xue    XIE Wei-jie    JIANG Ju-hui    CAI Wei-min   作者單位： Department of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China  期 刊： 環(huán)境科學學報（英文版）  ISTICSCI   Journal： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2004, 16(6)  分類號： X172  Keywords： Microcystis    diluted BG11 media    nitrogen,phosphorus    iron    depletion    dynamics   

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