实验室水生微宇宙的组建和基本生态学过程

SYNTHESIS AND FUNDAMENTAL ECOLOGICAL PROCESS OF AN AQUATIC MICROCOSM IN LABORATORY

An aquatic microcosm was synthesized in the laboratory by using pure cul- tured organisms,artificial medium and standard sediment.The artificial biotic assembly in- cluded eighr species of algae,two species of protozoa and one species of crustacean as well as the natural microbial community existing in the laboratory.The test duration lasted 28-31 days,during which the growth-decline relationship between algal community and Daphnia population,and the variations of gross primary productivity(P),total respiration (R)and P/R ratio were investigated.The results showed that the synthesized aquatic microcosm displayed the fundamental function and ecological process occurring in natural aquatic ecosystems.The biotic components and metabolism tended to be stable through the succession of microcosm,and the results were repeatable.The microcosm technique prom- ised to be a multispecies testing system in the risk assessment of chemicals on levels of popu- lation,community and ecosystem.