湖泊科学2012，Vol.24Issue(5)：755-764,10.
光照强度对铜绿微囊藻(Microcystis aeruginosa)和斜生栅藻(Scenedesmus obliqnus)生长及吸收特性的影响
Effects of different irradiation intensity on the growth and absorption properties of Microcystis aeruginosa and Scenedesmus obliqnus
摘要
Abstract
Cell number, cell size, chlorophyll-a (Chi.a) concentration, absorption and specific absorption coefficients of Microcys-tis aeruginosa and Scenedesmus obliqnus were determined in the different culture times at three different irradiation intensities. Oneway analysis of variance showed that irradiation intensity had great significant effects on cell number, Chl.a concentration and phy-toplankton absorption coefficients at 440 nm a ^ ( 440 ) , 675 am a h ( 675) in the entire experimental period. The largest values of these parameters were recorded in the light condition with 50 (jimol/(m2 · s). Phytoplankton needs optimal growth irradiation intensity because over-low or high light density could have negative effects on the growth rate of phytoplankton. Correlation analysis showed that there were significant positive correlations between a h (440) , ap^ (675) and Chl.a concentration under three different irradiation intensities for M. aeruginosa and S. obliqnus. Power correlation could be best used to describe the correlations between aph(440) , a h(675) and Chl.a concentration, while the linear correlation could be used to explain the relationships between a h (440 ) , a h (675) and cell number. Meanwhile the specific absorption coefficients of M. aeruginosa and S. obliqnus fluctuatedwithin small range in different irradiation intensities at different experimental periods, and increased with increasing irradiation intensity. A significant negative relationship was found between M. aeruginosa specific absorption coefficients at 440 nm, 675 nm and Chi.a concentration. However, the specific absorption coefficients of S. obliqnus had no relationship with Chi.a concentration mainly due to the composition and proportion of pigments and package effects. The average specific absorption coefficient integrated over the range of PAR (400-700 nm) of M. aeruginosa and S. obliqnus at three irradiation intensities of 5, 50, 100 u,mol/( m2 · s) are 0. 0144 , 0. 0134 , 0. 0160 and 0. 0086, 0. 0088 , 0. 0105 m2/( mg Chl.a) , respectively. The specific absorption coefficients of M. aeruginosa were significantly higher than those of 5. obliqnus mainly due to the algae cell size of M. aeruginosa, 3. 14 ±0.43 |xm, twice smaller than that of S. obliqnus, 7.24 ±0.79 u,m.关键词
铜绿微囊藻/斜生栅藻/吸收系数/比吸收系数/光照强度Key words
Microcystis aeruginosa/ Scenedesmus obliqnus/ phytoplankton absorption coefficient/ specific absorption coefficient/ irradiation intensity引用本文复制引用
殷燕,张运林,王明珠,刘笑菡,时志强..光照强度对铜绿微囊藻(Microcystis aeruginosa)和斜生栅藻(Scenedesmus obliqnus)生长及吸收特性的影响[J].湖泊科学,2012,24(5):755-764,10.基金项目
中国科学院知识创新工程项目(KZCX2-YW-QN312)、国家自然科学基金项目(40971252,40825004)、江苏省自然科学基金项目(BK2009336)和国家水体污染控制与治理科技重大专项项目(2009ZX07101-013)联合资助 （KZCX2-YW-QN312）
