The sampling surveys were conducted on benthic animals in Lianhua Island port in October 2019,November 2020,and October 2021 to understand the conservation effect of the ecological conservation area of Lianhua Island port on the Dongshui River.The differences in community structure of benthic animals between different regions were analyzed,and short-term changes of benthic animals in different conservation and non engineering areas were further compared.The results showed that at the overall level,the species of benthic ani-mals were increasing year by year,and the density,biomass,richness index(D),diversity index(H'),and evenness index(J)of benthic animals are showing an increasing trend year by year.From different regions,the number of benthic animal species in the improved area S2 increased,while the number of species in the en-hanced area S1 decreased first and then stabilized.The number of species in other areas showed a trend of de-creasing first and then increasing;The density and biomass of S1 and S2 benthic animals in the improved area and the biomass in other areas showed an increasing trend year by year.The average density of benthic animals in different areas decreased in 2020 and increased to 21.33 ind/m2 in 2021.The abundance index(D),diversi-ty index(H'),and evenness index(J)of benthic animals in fish nesting areas and other areas showed an in-creasing trend year by year.The richness index of S2 in the improved area increased from 0.74 in 2019 to 1.30 in 2020 and1.14 in2021.The diversity index(H')and evenness index(J)showed an increasing trend year by year.The research results indicated that permeable frameworks and fish nests create suitable water flow condi-tions for the survival of benthic animals,which is beneficial for their survival.The ecological conservation effect of the porous framework area is better than that of the fish nest discharge area.The water environment created by ecological conservation areas promotes the survival and reproduction of benthic animals,and with the in-crease of project implementation years,the number,density,biomass,and diversity change index of benthic animals show an increasing trend year by year.
Lianhua Island portecological conservation areastructural changes of benthos
NETL
NSTL
维普
万方数据
