Microcosms,generally including mesocosms,are small experimental ecosystems or model e- cosystems.In recent years,microcosms have been widely used in ecological field.“Biosphere2”,a huge microcosm even including human within,was constructed in 1 986 in USA for study of the Earth ecosys- tem.Microcosms have played an important role in protecting the Earth eco- environment.Microcosms are also useful methods in ecotoxicological research because they provide a possibility to study the effects of pollutants ...