洞庭湖生态经济区典型城市生态空间识别研究

Study on the Identification of Typical Urban Ecological Space in Dongting Lake Ecological Economic Zone

洞庭湖生态经济区受围湖造田、三峡水库运行以及高强度经济活动等影响,其生态环境状况不容乐观。以其益阳市为研究区域,依托GIS平台开展生态系统服务功能重要性和生态环境敏感性评估,并识别其生态空间。结果表明:(1)益阳市生态服务功能重要性以洪水调蓄和水源涵养为主,其次为生物多样性和水土保持,其极重要区和重要区面积占总面积的14.81%,主要分布在研究区南部、西南部,洞庭湖、大通湖流域及资江沿岸;(2)益阳市生态敏感性以石漠化为主,其次为地质灾害和水土流失,其极重要区和重要区面积占总面积的53.42%,呈片状分布在中西部山地丘岗区,如安化县全境、桃江西南及赫山区中部,零星分布于东北平原地区。(3)益阳市生态空间面积6297.09 km^(2),占土地总面积51.06%,涵盖益阳市主要的生态功能区和生态敏感区。

The eco-economic zone of Dongting Lake is affected by reclaim land from lakes,the operation of the Three Gorges Reservoir and the high-intensity economic activities,so its ecological environment condition is not optimistic.Taking Yiyang city as the research area and relying on the GIS platform,this thesis trends to carry out the ecosystem service function importance and ecological environment sensitivity evaluation,and to identify its ecological space.The results show that the main ecosystem service functions were flood regulation and water conservation function,followed by biodiversity maintenance and soil and water conservation function.The extremely important and the important region account for 14.81%of the studied area,which were mainly distributed in the south and southwest of the city area,Dongting lake,Datong lake basin and Zijiang river.The main ecological sensitivity was stony desertification,followed by geological hazards and soil and water erosion.The extremely important and the important region account for 53.42%of the studied area.These areas were flaky distributed in the mountainous and hilly areas of the central and western regions,including Anhua county,the southwest of Taojiang and the central part of Heshan district,sporadic distribution in the northeast plain area.The preliminary delineation of ecological space in the studied area was about 6297.09 km^(2),accounting for 51.06%of the studied area and covering the main ecological functional areas and ecological fragile areas in Yiyang city.