摘要
长江干流广布的季节性淹水造成的江心洲岛湿地,具有保护生物多样性、净化环境等重要生态作用,是长江流域生态安全保障的重要物质基础。长江流域湿地的分布、动态及其生态意义受到广泛关注,而其重要组成部分之一的长江干流江心洲岛湿地研究报道相对较少。利用Google Earth高清遥感影像目视解译提取江心洲岛湿地,采取GIS方法提取河道形态指标,采用相关分析及有序逻辑回归分析,揭示了长江干流江心洲岛湿地分布格局,探讨了河道形态要素对其影响。结果表明:长江干流江心洲岛湿地空间上呈现四段式分布,即宜宾-忠县河段,仅有中小型江心洲岛湿地分布;忠县-宜昌河段,完全没有江心洲岛湿地分布;宜昌-九江河段,以中小型江心洲岛湿地为主;九江-长江口河段,各面积水平江心洲岛湿地广泛发育,中小型江心洲岛湿地比上游更密集而大型江心洲岛湿地无明显差异。长江干流小型江心洲岛湿地数量多,大型江心洲岛湿地数量少。大型江心洲岛湿地比小型的对河道形态更为敏感。江心洲岛湿地面积与河宽、河宽差有显著正关系,与两岸差有显著负关系;宽阔的、顺直对称的河道平面形态更有利于大型江心洲岛湿地的演化。
Widespread in the Yangtze River mainstream,wetlands of mid⁃channel bars and islands caused by seasonal inundation have important ecological effects such as protecting biodiversity and purifying the environment.These wetlands are regarded as important material basis for ensuring ecological security in the Yangtze River basin.The distribution and dynamics of wetlands in the Yangtze River basin and their ecological significance have received a lot of attention,while the wetlands of mid⁃channel bars and islands in the Yangtze River mainstream,an important component of Yangtae River basin wetland,has been less studied and reported.In this study,Google Earth high⁃resolution remote sensing images were used to visually interpret and extract the wetlands of mid⁃channel bars and islands,GIS methods were adopted to extract channel morphological parameters and correlation analysis as well as ordered logistic regression analysis were used to reveal the distribution of these wetlands.Also,the influence of channel morphology on the distribution of the wetlands was explored.The results were as follows.The spatial distribution of the wetlands demonstrated four sections,namely,Yibin⁃Zhongxian section,where only small and medium⁃sized wetlands were distributed;Zhongxian⁃Yichang section,where no wetlands were distributed;Yichang⁃Jiujiang section,where small and medium⁃sized wetlands dominated;and Jiujiang⁃Yangtze River Estuary section,where wetlands of all area level were widely developed.In the last section,the small and medium⁃sized wetlands were denser than in the immediately upstream Yichang-Jiujiang section,while the large⁃sized wetlands were almost the same as in the Yichang⁃Jiujiang section.The number of small⁃sized wetlands in the study area was larger than that of large⁃sized wetlands.Small⁃sized wetlands were less sensitive to channel morphology than the large⁃sized wetlands.The area of the wetlands had a significant positive relationship with channel width and the difference in channel wi
作者
秦风约
段学军
邹辉
王君櫹
郭宇菲
王晓龙
QIN Feng-yue;DUAN Xue-jun;ZOU Hui;WANG Jun-xiao;GUO Yu-fei;WANG Xiao-long(Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;University of Chinese Academy of Sciences,Beijing 100049,China;University of Chinese Academy of Sciences,Nangjing College,Nanjing 211135,China;School of Public Administration,Nanjing University of Finance and Economics,Nanjing 210023,China)
出处
《长江流域资源与环境》
CAS
CSCD
北大核心
2024年第1期66-77,共12页
Resources and Environment in the Yangtze Basin
基金
国家重点研发项目(2022YFC3204104)
国家自然科学基金联合基金项目(U2240219)。
关键词
湿地
江心洲岛
长江
空间分布
河道形态
wetland
mid⁃channel bars and islands
Yangtze River
spatial distribution
channel morphology
