Preliminary Evaluation On Ecological Restoration Effect Of Artificial Reefs In Danglong Island,Changdao Island

In recent years,artificial reefs have been widely implemented in coastal provinces and cities in China as an important means of improving marine ecological environment and proliferating fishery resources.In this paper,the artificial reef area of the island of Danglang Island is taken as the research object.The tracking investigation before and after the reef-return was carried out,and two contrast surveys of the radiation area and the control area were set up,and the ecological restoration effect of the artificial reef in the sea area was preliminarily evaluated.Based on the results of the 5 voyage surveys from 2013 to 2015,this study compared the seawater,sedimentary environment and phytoplankton,zooplankton,benthic organisms and fishery organisms before and after the retesting of the three control sea areas,and analyzed the artificial reefs in ecological restoration.The effect of the above,and the fuzzy comprehensive evaluation method was used to construct an evaluation model of ecosystem health to evaluate the ecological health of artificial reefs in the Danglang Island.The main results are as follows:From 2013 to 2015,the survey results of water quality and sediments in the artificial reef area,radiation area and control area of the Langlang Island showed that all water quality indicators met the seawater quality standards of the “Sea Water Quality Standards” and the sediment index content reached “ A class of sediment quality standards in Marine Sediment Quality.The fish reef area,the radiation area and the control area have a seasonal trend.The overall effect of the reef area is better than that of the radiation area and the control area,indicating that the artificial reef has a certain effect but it is not particularly obvious,which may be related to the whole There is still a need for continuous monitoring related to changes in the marine environment.The species of phytoplankton are mainly diatoms and dinoflagellates,and the main dominant species are diatoms;the species and main dominant species of zooplankton are mainly arthropods;the species and main dominant species of benthic organisms are polychaetes and soft bodies.The main species;the species and main dominant species of benthic animals are mainly fish and shrimp.After reefs,the species,density or biomass of phytoplankton,zooplankton,benthic organisms and fishery increased,and the community structure also stabilized.The diversity,richness and evenness of the community were all after the reef construction.It has gained varying degrees of growth,especially in the reef area.The ecological health index of the three is reef area(0.783)>radiation area(0.646)> control area(0.594).Compared with non-reefing,the ecosystems of the reef and radiant areas are all separated from the sub-health state and gradually improved,however,the control area is still in a sub-health state and the development is unstable.Therefore,a conclusion can be drawn that the ecosystem of artificial reef area of Danglang Island is more stable than control area,and it also improve the ecosystem health of radiation area,which indicate that the artificial reefs in Danglang Island has exerted certain effects in the restoration of ecological environment and the conservation of marine fishery resources.Researching reef ecosystem health and scientifically assessing artificial reef ecological effects are significant for the construction of reef projects,environment protection,stock enhancement,efficient administration,and sustainable development of fisheries.