广东省高州水库春季蓝藻水华成因初步探讨

高州水库为广东省茂名市重要的饮用水源地,2009年和2010年春季相继出现蓝藻水华,给居民饮水带来安全隐患.对高州水库2009年和2010年春季水华情况进行分析,结果表明:两年浮游藻类细胞密度最高分别达4.08×107 cel1s/L和1.47 x 108cells/L,其中蓝藻所占比例分别为98.2%和98.7%,优...

Preliminary regulating factors of spring cyanobacteria bloom in Gaozhou Reservoir, Guangdong Province

Gaozhou Reservoir is an important drinking water source of Maoming city of Guangdong province.Cyanobacteria blooms, occurring in spring of 2009 and 2010,had brought safe hidden trouble to residents.Based on the data collected from the reservoir in two springs,the highest densities of phytoplankton in the spring of 2009 and 2010 were 4.08×10⁷ cells/L and 1.47×10⁸ cells/L,and cyanobacteria densities accounted for 98.2% and 98.7% of total phytoplankton,respectively.The dominant species were Anabaena spp.and Microcystis aeruginosa in the two springs in the reservoir.The TN/TP ratios ranged from 28 to 64,phosphorus was the limiting factor for phytoplankton development.The chlorophyll-a concentration ranged from 2.5 to 31.6 mg/m³ , and the cor-relation between pH(r=0.753, P<0.01)and DO(r=0.565, P<0.05) was excellent.It can be inferred that the main reasons of spring phytoplankton blooms were the high stability of water, water temperature rising and the nitrogen and phosphorus level close to the threshold value of spring phytoplankton blooms.