微生物对巢湖沉积物生物可利用磷的稳定性影响

以巢湖沉积物为研究对象,利用化学提取方法对四个采样点表层沉积物进行生物可利用磷(BAP)的测定。并通过沉积物—湖水体系的好氧厌氧模拟实验,研究添加菌剂对磷的释放或积聚的影响。结果表明:BAP含量与水体中的Chl-a、TP及TDP浓度显著相关,说明表层沉积物的生物可利用磷含量能够反映水体富营养化的强度;好氧环境下,微生物作用有助于磷的积聚;而在厌氧环境下,微生物作用强化了磷的释放;在有菌、无菌厌氧释放实验结束后,BAP含量显著减少。表明微生物在磷的循环中起了重要作用,可以直接或间接影响生物可利用磷中各形态磷的迁移转化。

Effect of Microbe on Stability of Bioavailable Phosphorus in Sediment of Chaohu Lake

Microbial effects on phosphorus release were investigated under both aerobic and anaerobic conditions in a simulated sediments-lake water system using sediments from Chaohu lake.Microbial activities enhanced the phosphorus uptake to some extent under the aerobic condition,and significantly activated the phosphorus release under the anaerobic condition.Bioavailable Phosphorus(BAP) in sediments of four sites was analyzed by chemical extraction method.The BAP content was highly correlated to content of Chl-a,TP and TDP and coincided with the corresponding trophic level of overlying water.The BAP content decreased corresponding to microbial and non-microbial system under anaerobic condition in four sites.These data showed microbe be a key factor in circulation of phosphorus and transformation of BAP.