滇池水环境中微囊藻毒素的生物降解

Biodegradation of microcystin in Dianchi Lake aquatic environment.

利用从滇池蓝藻水华生物量中提取的微囊藻毒素试验溶液,接种滇池沉积物的微生物,研究其在有氧条件下的生物降解过程.结果表明,水体中的微囊藻毒素易被生物降解,其降解反应服从方程C=A/(1+Be-Ct).当温度在12~25℃,加入的沉积物量为1~10g时,藻毒素粗提液的平均降解反应速率为3.18(1.13d-1,平均半衰期t1/2为2.66(1.27d,且藻毒素的生物降解速度随反应温度和沉积物量的增加而提高.研究结果还表明,生物降解是去除滇池水环境中微囊藻毒素的一个重要机制.

Test solution of the microcystin extracted from the microbial community was used to inoculate the microbe from the sediment of Dianchi Lake; and the biodegradation of microcystin under oxygin-containing acrial condition was studied. Results revealled that microcystin in waters is fragile to biodegradation and the process can be described as the equation: C=A/(1+Be-Ct). The degradation rate of microcystin increases with the temperature and amounts of sediment. at 12~25℃ and added sediment of 1~10g, the average half-life of microcystin is 2.661.27 days and its average reaction rate is 3.181.13d-1. The results indicate that the biodegradation of microcystin is an important mechanism of its natural removal in Dianchi Lake aquatic environment.