两个分离菌株对2，4-D降解效率的微生态系统模拟

在微生态系统模拟条件下，２个分离菌株Ｓｐｈｉｎｇｏｍｏｎａｓ ｐａｕｃｉｍｏｂｉｌｉｓ ９２５６，Ｒａｌｓｔｏｎｉａ ｅｕ－ｔｒｏｐｈｕｓ ＪＭＰ表现出对除草剂２，４－Ｋ的高效降解性能。但Ｒ．ｅｕｔｒｏｐｈｕｓ ＪＭＰ能在更多的模拟条件下成为优势种群。对２个菌株的种肖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２４ｈ的时滞；种群的增长量不完全受底物２，４－Ｄ消耗的多少

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

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.