平原河网区湖滨生态缓冲带划定研究——以元荡为例

Delineation of lakeside ecological buffer zone of plain river network——Taking Yuan Lake as an example

元荡作为长三角绿色一体化示范区的核心且为苏州市和上海市交界湖泊,具有重要的地理战略意义。通过现状调查与资料收集,对元荡八荡河桥断面、元荡湖口出入湖通量及元荡湖口水质进行测量,运用ArcGIS对遥感影像进行遥感解译和空间统计分析,参考《江苏省河湖生态缓冲带划定及综合管控技术指南》,确定基于水体保护目标的生态缓冲带划定方法,对元荡进行生态缓冲带划定并提出修复建议。结果表明:元荡湖岸带总长度为15 315 m,其中30%为生态保护型(植被良好型);70%为生态修复型(农田型、城镇型、村落型及河口型);元荡生态缓冲带宽度范围为7~993 m,面积为1.22 km^(2)。在划定元荡生态缓冲带的基础上,识别其主要修复区域,从5个方面提出具有针对性的生态修复措施,可为该区域生态修复提供技术支撑。

As the core of the Yangtze River Delta Green Integration Demonstration Zone and the junction lake between Suzhou and Shanghai,Yuan Lake has important geographical strategic significance.Through the current situation investigation and data collection,we measured the cross-section of the Badang River bridge,the inlet and outlet fluxes of Yuan Lake and the water quality of Yuan Lake,ArcGIS was used to interpret the remote sensing images and analyze the spatial statistics,and referred to the“Jiangsu Province River and Lake Ecological Buffer Zone Delimitation and Comprehensive Management and Control Technical Guide”,we determine the ecological buffer zone delineation method based on the protection objectives of the water body,delineate the ecological buffer zones of Yuan Lake,and put forward the suggestions of restoration.The results show that the total length of the lakeshore zone in Yuan Lake is 15315 m,of which 30%is ecological protection type(well-vegetated type);70%is ecological restoration type(farmland type,town type,village type and estuary type);The width of the ecological buffer zone in Yuan Lake ranges from 7~993 m,with an area of 1.22 km^(2).On the basis of delineating the ecological buffer zone in Yuan Lake,we identify the main areas for restoration,and put forward the following recommendations in five aspects based on the delineation of the Yuan Lake ecological buffer zone,the main restoration areas were identified,and targeted ecological restoration measures were proposed from five aspects,which can provide technical support for ecological restoration in this area.