摘要
湿地是地球上重要的生态系统之一,有"地球之肾"的美誉。三江平原是我国最大的淡水沼泽湿地集中分布区,是重要的商品粮产地,其湿地生态环境健康与否,与粮食安全息息相关。应用遥感及GIS手段,利用TM,ETM,CBERS三期遥感影像,计算研究时段内的动态度、转移矩阵,定量反映各类湿地的变化、不同湿地类型间的转移情况及空间分布规律,进而分析湿地的变化原因。研究结果表明:近20年来,三江平原湿地湖泊及河流湿地趋于稳定,沼泽湿地大面积减少,人工湿地大幅度增加。沼泽湿地,人工湿地与非湿地间的转化显著。
Wetland is one of the most important ecological systems on the earth with high biology-function. Sanjiang Plain is not only the largest concentrated distribution area of freshwater swamp in China, but also the most significant commodity grain production area. Whether the wetland environment healthy or not will have a great impact on food supply security. By use of RS and GIS technology TM, ETM, and CBERS data, author interpreted wetland on the RS data, calculated dynamic degree and transfer matrix of wetland, determined the distribution and transfer status of different wetland subtypes, then analyzed the mechanism of wetland changes. The research result shows that the variety of lake and river is less, swamp area reduces significantly, and constructed wet- land area increases seriously. The changes among swamp, constructed wetland and non-wetland are significantly.
出处
《生态环境学报》
CSCD
北大核心
2009年第4期1374-1378,共5页
Ecology and Environmental Sciences
基金
中国地质调查局项目(1212010510613)
关键词
三江平原
湿地
遥感
动态度
转移矩阵
Sanjiang Plain
wetland
remote sensing
dynamic degree
transfer matrix
