磷限制下光照和温度对水华鱼腥藻生长动力学的影响

Effect of Light and Temperature on Growth Kinetics of Anabaena flosaquae Under Phosphorus Limitation

磷、光照和温度是淡水水体藻类生长的关键环境因素,但磷限制下光照、温度交互对藻类生长动力学的影响鲜有报道.以水华鱼腥藻(Anabaena flosaquae)为研究对象,通过机制实验与模拟分析,发现光照条件恒定,磷限制下水华鱼腥藻的最适生长温度为20℃;温度条件恒定,磷限制下水华鱼腥藻的最适生长光照度为3 000 lx;但光照度过高,超过水华鱼腥藻光饱和点会抑制鱼腥藻的生长,生物积累量显著减少.通过拟合模型可知光热交互作用下水华鱼腥藻最适温度、光照度分别为21.03℃±1.55℃、2 675.12 lx±262.93 lx,该参数值接近春末夏初水体实际的光热条件.模型将为进一步预测水华鱼腥藻水华提供重要基础.

Phosphorus,light and temperature are the key environmental factors leading to algae growth. But the effects of interaction between light and temperature on the growth of Anabaena flosaquae under phosphorus limitation were not well documented in literature.Anabaena flosaquae was selected for the study and lab-scale experiment and simulation were carried out. The results showed that the optimal temperature of Anabaena flosaquae was 20℃ under phosphorus limitation when the light intensity was constant,and the optimal light intensity( illuminance) of Anabaena flosaquae was 3 000 lx under phosphorus limitation when the temperature was constant.Based on model fitting and parameter calibration,the optimal temperature and light intensity of Anabaena flosaquae were 21. 03℃ ±1. 55℃ and 2 675. 12 lx ± 262. 93 lx,respectively. These data were close to the actual water environmental condition at the end of spring. Results of this study will provide important foundation for prediction of Anabaena blooms.