摘要：Inland, in particular incity lake ecosystems have long been affected by numerous types of human interventions that have a negative impact on their water quality and ecological state. Thus, restoration of the lake ecosystems is a preliminary process. Integrated ecological engineering for restoration (IEER) was conducted in two gulfs (total 6.01 km~2) of Lake Dianchi containing hypereutrophic water of frequent cyanobacterial blooms for four years. This technology consists of two main processes: (1) specially-designed equipment and filterfeeding fish to remove the cyanobacterial biomass, (2) re-plantation of macrophytes to restore aquatic ecological system. The biodiversity indices (Simpson-Wiener and Shannon) of the zooplankton and zoobenthos and the trophic state index (TSI) were used to assess the outcome of IEER. The results showed that the biodiversity index of zooplankton and zoobenthos have increased significantly in response to the improved growth conditions. The TSI values showed that the eutrophic level of the gulfs was not reduced, indicating that the IEER did not improve the water quality of the ecosystem. Failure of the IEER in improving water quality may partly resulted from the frequent cyanobacterial blooms. In future efforts should be made to consider species distribution, community structure, species interactions in addition to the biodiversity index and trophic state index.
关键词：Integrated ecological engineering for restoration (IEER);cyanobacteria;biodiversity index;trophic state index;Lake Dianchi
