CAJ | 학술논문

通过室内模拟实验,研究了好氧条件下MCLR在太湖沉积物-水体系中的生物降解过程,着重探讨了外加碳源、不同形态的氮源和磷源对该过程的影响.结果表明,好氧条件下沉积物中MCLR经过8 d明显的迟滞期,于第16 d降解到检测限以下,说明太湖沉积物中的土著微牛物具有降解MCLR的能力.外加氨氮、硝氮和碳源对MCLR的降解速率均没有显著影响(P≥0.05),而外加溶解性磷源可显著促进MCLR的降解(P<0.01),说明在天然水体沉积物中,磷可能是MCLR好氧降解过程的限制性营养元素.这一结果对于正确评价水体中MC的微生物降解能力以及准确预测MC的浓度变化趋势具有指导意义.
통과실내모의실험,연구료호양조건하MCLR재태호침적물-수체계중적생물강해과정,착중탐토료외가탄원、불동형태적담원화린원대해과정적영향.결과표명,호양조건하침적물중MCLR경과8 d명현적지체기,우제16 d강해도검측한이하,설명태호침적물중적토저미우물구유강해MCLR적능력.외가안담、초담화탄원대MCLR적강해속솔균몰유현저영향(P≥0.05),이외가용해성린원가현저촉진MCLR적강해(P<0.01),설명재천연수체침적물중,린가능시MCLR호양강해과정적한제성영양원소.저일결과대우정학평개수체중MC적미생물강해능력이급준학예측MC적농도변화추세구유지도의의.
The aerobic biodegradation process of microcystin LR( MCLR) in the sediment-water system was investigated through a series of well-controlled microcosm experiments using sediments from Taihu Lake as inocula. The effects of the additions of nutrient elements(carbon, nitrogen and phosphorus) on the degradation process were assessed. The results showed that MCLR was degraded to below the detection limit at the 16th day with a lag period of 8 days, indicating that indigenous microorganisms in the sediment of Taihu Lake were capable of degrading microcystin under aerobic conditions. The addition of glucose or nitrogen (NH_4-N and NO_3-N) had no obvious effect on the biodegradation of MCLR( P≥0.05), whereas the addition of phosphorus could significantly promote the biodegradation of MCLR( P<0.01). These results suggest that phosphorus might be the limited nutrient for aerobic biodegradation of MCLR in natural sediment. These findings are helpful for evaluating the biodegradability of MC and predicting the tendency of MC pollution in eutrophic water bodies.