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。
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 be- tween 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.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
2013年第2期277-282,共6页
Oceanologia Et Limnologia Sinica
基金
国家水体污染控制与治理科技重大专项
2011ZX07101-012-008号
国家自然科学基金项目
31070451号
浙江省重大科技专项
2010C02001号
浙江省自然科学基金项目
Y5110067号