两个分离菌株对2,4-D降解效率的微生态系统模拟  

Simulation of Microcosms of Two Strains Isolated from Contaminated Soil by 2,4-D for Population Dynamics and Substrate Degradation

作　　者：夏北成[1] 李婉华 David S.Treves James M.Tiedje 

机构地区：[1]中山大学环境科学研究所,广东广州5102752 [2]广州污水处理总厂 [3]Center for Microbial Ecology,Michigan State University

出　　处：《中山大学学报（自然科学版）》2000年第3期111-115,共5页Acta Scientiarum Naturalium Universitatis Sunyatseni

摘　　要：在微生态系统模拟条件下 ,2个分离菌株Sphingomonaspaucimobilis 92 56 ,Ralstoniaeu trophusJMP表现出对除草剂 2 ,4 D的高效降解性能 .但R eutrophusJMP能在更多的模拟条件下成为优势种群 .对 2个菌株的种群消长影响最大的生态因子是湿度和 2 ,4 D的浓度 .种群增长与 2 ,4 D降解有约 2 4h的时滞 ;种群的增长量不完全受底物 2 ,4 D消耗的多少制约 .多个生态因子的综合作用说明模拟的微生态系统离自然系统还有较大的差别 .Two strains, Sphingomonas paucimobilis 9256 and Ralstonia eutrophus JMP, isolated from contaminated soil, can effectively degrade 2,4 dichlorophenoxyacetic acid (2,4 D) in simulative microcosm system. In most situations strain Ralstonia eutrophus JMP was dominant population. The most important ecological factors affecting two strain population dynamics were microcosm moisture and substrate (2,4 D) concentration. There was a 24 hour time lag between population growth and 2,4 D degradation. Total population growth was not directly relative to quantity of substrate degraded by the strains. Multiple factors affect microcosm situation together. Some combined results revealed that the simulative microcosms are not very closed to the natural environment system.

关 键 词：生物降解 二氯苯氧基乙酸 微生态系统模拟 菌株 

分 类 号：X172[环境科学与工程—环境科学] X703