【摘要】 在不同初始pH值条件下培养蓝藻水华优势种铜绿微囊藻（Microcystis aerugmosa）,研究其生长过程对培养液的pH值和氮转化的影响.结果表明,处于延迟期和对数生长期的铜绿微囊藻使培养液的pH值上升,pH从初始的7.2、8.0和8.8分别上升到最大值10.02、10.34和10.94;稳定期和衰亡期的微囊藻使培养液pH值降低.初始pH值为8.8时,最终pH降至8.66.在微囊藻生长过程中,培养液中NO₃^-含量逐渐降低,NO₂^-含量先升高再降低,分别在60d和67d后降至零.试验结束时,不同pH值培养液中总氮含量比起始时分别下降了25.97%、27.52%和28.16%,说明化合态无机氮可以经过反硝化作用生成氮气而溢出培养液,因此,较大密度水华水体中存在反硝化的脱氮过程.更多还原

【Abstract】 Microcystis aeruginosa,dominance specie in the cyanobacterial bloom,was cultured under the different initial pH values in order to study the effect of the growth of M.aeruginosa on the pH value and the nitrogen transformation in the medium.The results showed that the pH value rose in the lag phase and exponential phase of M.aeruginosa,and the maximum pH values rose from 7.2,8.0 and 8.8 to 10.02,10.34 and 10.94 respectively,then decreased in the stationary phase and the decline phase of M. aeruginosa.While initial pH value was 8.8,it decreased to 8.66 at the end of the experiment.NO3-concentration decreased and NO₂^- concentration rose earlier then decreased later in the medium during the growth period of/14 aeruginosa.Both the concentrations of NO₃^-and NO₂^-decreased next to zero in the 60th and the 67th days,respectively.Compared with the initial total nitrogen content,the final total nitrogen contents decreased 25.97%,27.52% and 28.16% under different initial pH values,respectively.The nitrogenous compound was transformed to N₂ through denitrification.Thus,there is distinct decrease of nitrogenous compound by denitrification in M.aeruginosa bloom.更多还原