Study On Plant Evaluation And Application Strategy Of Riparian Fluctuation Zone For Ecological Revetment Of Binhai River In Tianjin

The water-fluctuation zone is a sensitive and fragile zone of ecological environment because of the complexity and fragility of habitat.In recent years,with the rapid development of the city,the ecological problems caused by channelization and hardening of the river have become increasingly prominent.With the attention paid to the construction of ecological civilization,the ecological restoration of the river has become increasingly important.The river fluctuation zone can play the role of water protection barrier and corridor connecting ecological patches,which has great development value and potential.In Tianjin coastal habitat conditions complicated and influenced by saline land,weathering and other natural conditions optimum plant less,ecological system is fragile,so choose typical river down with Tianjin Binhai new area as study area,study down area plant characteristics,based on recommendations for ecological revetment of different forms to the plant disposition,It is of great significance to the ecological construction of river.In this paper,the watercourse in Tianjin coastal area is taken as the research object,and based on the theories and practices of water-level fluctuation zone ecological restoration in other regions at home and abroad,the plant characteristics of water-level fluctuation zone of different river site conditions are explored,including the differences in plant species,dominant species and combinations,and ecological diversity,and the impact of ecological restoration on them.The plant selection and application strategies were explored according to the site conditions of river channels,providing guidance for the plant restoration of watercourse water-level-fluctuation zone in coastal areas.The results were as follows:(1)Maintenance mode had an effect on the species and number of plants in riparian water level zone,but had little effect on dominant species.Artificial maintenance had more plant species than natural condition,and the degree of maintenance affected the landscape performance of riparian water level zone.Revetments had an effect on dominant plant species in the water-level-fluctuation zone,but had little effect on the total number of species.(2)When the degree of human disturbance was high,the diversity index also increased.Under the influence of different conditions,the artificial maintenance of ecological diversity was higher than that of the natural state,and the artificial bank protection was higher than that of the natural vegetation protection.In the calculation and analysis of habitat similarity,the data showed that the impact of maintenance difference on habitat was greater than that of bank protection difference.Combined with the two types of ecological analysis,it was found that ecological restoration significantly changed the habitat in the water-level fluctuation zone,and the ecological diversity index was higher after artificial restoration.Artificial restoration played an important role in vegetation restoration and habitat improvement in the water-level fluctuation zone.(3)inX~2 correlation calculation,a negative correlation between plant combination more and universal correlation was not significant,Jaccard index test results in about half of plants to negative correlation,smaller values of the JI,the niche breadths vary greatly and the correlation between strength is low,both correlation analysis showed that most down with plants in real habitat has strong independence or compete.At present,most of the plant communities in the water-level-fluctuation zone of Tianjin Coastal River are annual herbaceous plants and pioneer plants in the early stage of succession.The relationship between plant species and species is easily disturbed and changed by external factors,and the plant community is unstable.