【摘要】 采用水质监测方法对2008—2010年南太湖水域三个入湖口(小梅港、新塘港、大钱港)水体中蓝藻生物量、CODMn和DO的时空变化特征进行了监测和调查,并通过SPSS10.0软件对蓝藻生物量与CODMn和DO的相关性进行了分析。结果表明:(1)3年内南太湖入湖口蓝藻颗粒数在1.0×106个/L以上范围的频率每年超过50%,最高在3.0×107个/L左右;(2)南太湖入湖口CODMn指标大部分处于较高的污染水平,最高有6.5mg/L,最低约3.0mg/L;(3)蓝藻生物量与CODMn的相关性系数r介于0.3—0.7之间,呈现中低度正相关;(4)3年内蓝藻生物量与DO的相关性系数r介于0.30—0.50,呈现低度正相关,DO浓度有70%以上的频率大于6.0mg/L。结果表明,3个入湖口溶解氧指标能达Ⅱ—Ⅲ类地表水水质标准,但有机物污染已经不容忽视,并且与蓝藻暴发呈一定的相关性。更多还原

【Abstract】 Annual variations in blue algae biomass, CODMn and DO level in Xiaomei, Xintang, and Daqian inlet areas of south Taihu Lake during 2008—2010 were determined by water quality monitoring methods, and the correlations between the blue algae biomass and CODMn /DO were analyzed with SPSS 10.0. The results show that: (1) The days with blue algae biomass above 1.0×106/L amounted more than half a year during 2008—2010, and the highest biomass was around 3.0×107/L. (2) The CODMn concentration in inlet areas of south Taihu Lake was often in high pollution level (3.0—6.5mg/L). (3) The correlation coefficient (r) between blue algae biomass and CODMn level ranged 0.3—0.7, indicating low/moderate positive correlation. (4) The r value between blue algae biomass and DO level during 2008—2010 was 0.30 to 0.50, showing low-positive correlation, and the frequency of DO concentration above 6.0mg/L was more than 70%. All the results demonstrate that DO value in south Taihu Lake inlet met the Class Ⅱ—Ⅲ of surface water quality in national standards. Organic nutrient pollution should not be ignored because it correlated with the outbreaks of blue algae bloom.更多还原