胶体的来源和胶体有机碳浓度对其自身菌群生长的影响

Effects of colloid sources and concentrations of colloidal organic carbon on the growth of colloids' own nature bacteria community

利用错流超滤技术分离厦门湾东南部海域、九龙江河口及九龙江水体中的胶体,并利用实验室模拟培养实验研究了胶体的来源和胶体有机碳(COC)浓度对其自身菌群生长的影响.结果表明,不同来源的3种胶体对自身菌群均有不同程度的促进作用,而且其依序为海洋胶体>河口胶体>河流胶体.海洋胶体和河口胶体中自身菌群的相对增长率的平均值Y1、Y2与CCOC之间呈正相关关系;而河流胶体中自身菌群的平均相对增长率Y3与CCOC却呈负相关关系.

Colloids were abstracted by cross-flow uhrafiltration technique from Xiamen Bay,Jiulongjiang Estuary and Jiulongjiang River,respectively. The effects of colloids with different sources and different concentrations of colloidal organic carbon（COC） on the growth of colloids＇ own nature bacteria community were studies. The results showed that the relative increasing rate （Y） of colloids＇ own nature bacteria community were 44.9% - 133.0% ,101.1% - 210.9% and 47.5% - 98.5%, respectively. The average relative increasing rate （Y） were 91.6%, 150.9% and 72.8%, respectively. The maximum growth stimulations of colloids＇ own nature bacteria community for 3 colloids were riverine colloids, marine colloids and estuarine colloids in descending order. The results show that there were positive correlations between the average relative increasing rate （Y） and the concentrations of colloidal organic carbon （COC） for estuarine colloids＇ own nature bacteria community and for marine colloids＇ own nature bacteria community. However, the average of relative increasing rate （Y） of the riverine colloids＇ own nature bacteria community was negatively correlated with the concentrations of colloidal organic carbon （COC）.