Evaluation of ecological restoration effect of steel wire mesh stone cage revetment in middle and lower reaches of the Yangtze River
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Abstract:
In recent years,a series of steel wire mesh stone cage ecological revetment projects are carried out in the middle and lower reaches of the Yangtze River,but there is no follow-up investigation and evaluation on the ecological restoration effect after the completion of these projects. Based on the investigation of vegetation and matrix of six steel wire mesh stone cage revetments before and after the flood season in 2019,we analyze the annual and interannual successions of vegetation. Combined with the hydrologic data,matrix characteristics and field observation,we screen four vegetation characteristic factors and seventeen environmental impact factors for correlation analysis. The results show that after restoration,the relatively single vegetation succession seeded at the completion of the revetment protection area is replaced by a multi-species community dominated by herbage plants,and the ecological restoration effect of the revetment protection site is good. The time of revetment,the percentage of clay,silt and sand in the matrix and the duration of inundation are the main factors affecting the succession of vegetation in the engineering area.