南槽航道治理一期工程对长江口九段沙湿地生态变化的影响

Impact of Nancao channel regulation phase I project on ecological change of Jiuduansha wetland in the Yangtze Estuary

为探究南槽航道治理一期工程对长江口九段沙湿地生态变化的影响,于2017、2019、2020年对九段沙湿地附近水域的非生物因子和生物因子进行调查。通过对比施工前后九段沙湿地区域水动力条件、水质、沉积物的监测数据,研究工程对非生物环境的影响,并采用生物多样性分析、遥感解译等手段分析工程对生物因子的影响。结果表明,区域水动力条件、水质和沉积物因子在施工前后存在一定波动,但无显著变化;浮游、底栖生物多样性有所增加,植被面积呈逐年扩增趋势,说明南槽航道一期工程的实施不会对九段沙湿地生态现状产生显著的不利影响,且对湿地多样性的增加起到一定的积极作用。

In order to explore the impact of the Nancao channel regulation phase I project on the ecological change of Jiuduansha wetland in the Yangtze Estuary,we investigate the abiotic and biological factors in the waters near the wetland in 2017,2019,2020,compare the monitoring data of hydrodynamic conditions,water quality and sediments in the wetland before and after the construction,analyze the impact of the project on the abiotic environment,use the biodiversity analysis,remote sensing interpretation and other methods to analyze the impact of project on the biological factors.The results show that the regional hydrodynamic conditions,water quality and sediment factors fluctuate before and after construction,but there is no significant change.The diversity of planktonic and benthic organisms increase,and the vegetation area expands year by year,the implementation of Nancao channel phase I project does not have a significant adverse impact on the ecological status of Jiuduansha wetland,and the project also plays a positive role in the increase of wetland diversity.