The Impact of Connected Dams on the Community Structure of Benthic Animals in Mountainous River Channels During the Autumn Flood Season
In order to explore the impact mechanism of dams with temporal connectivity on water ecology of moun-tainous streams,six mountainous streams with different barrier coefficients in Lishui City were monitored and the impact of river barrier coefficient on benthic animal communities is analyzed in September and October 2022,during which time the methods of combination of field sampling,field measurement and indoor identification were adopted,and macroinver-tebrate benthos were used as indicator organisms of water ecology.The results show that in terms of the overall river course,the construction of dams with temporal connectivity has little impact on the species diversity of the benthic fauna community,but has a strong correlation with the density of molluscs,and the barrier coefficient of dams with temporal connectivity is negatively correlated with mollusc density;As for the variation of a single channel along the river,with the increase of barrier coefficient,the benthic density of the river develops from the trend of step reduction to the trend of u-niformity.At present,there is a lack of effective evaluation indexes for the impact of dam construction on river benthic organisms.The barrier coefficient can be used as an indicator to evaluate the impact of dam construction on benthic organ-isms of river temporarily.
river connectivitybenthonic animalwater weirbarrier coefficientimpact
万方数据
维普
