摘要
基于1988、1995、2001和2007年的四期TM数据,应用GIS/RS技术与景观格局分析软件FRAGSTATS,定量分析大辽河口地区湿地景观格局的动态变化。结果表明,自1988年以来,大辽河口地区的湿地面积逐年增加,湿地景观多样性指数和均匀度指数呈现先降后升的趋势,景观破碎化程度增强。湿地类型变化主要表现在大量的自然湿地转化为人工湿地或人工景观,具体表现在转化为建筑用地、水稻田、养殖区。1988～1995年期间,大辽河口地区的环境质量下降,该地区生物生活环境的多样性降低,造成了一些物种种群数量的减少甚至消失;但是自1995年以后,该地区的景观多样性和均匀性升高,抗干扰能力增强,环境质量有所提高。研究区湿地景观格局的动态变化主要是受自然条件和人为活动干扰共同作用的结果。
The historic data sets are derived from 1988,1995,2001 and 2007 Landsat TM images after supervised classification and visual interpretion.Using the technology of GIS /RS and FRAGSTATS,the processess of wetland changes in Liaohe between the year of 1988,1995,2001 and 2007 are analyzed,the characteristics of wetland quantity change and wetland landscape pattern’s dynamics and driving forces are also discussed.The results indicated that： Since the year of 1988,the area of wetland in Liaohe has being increasing.The landscape diversity index and evenness index tended to decrease firstly and then increase.The landscape fragmentation strengthened.The changes of wetland types mainly reflected in a large number of natural wetland into artificial wetland or artificial landscape,which specifically reflected in building land,rice fields and aquculture area.Between 1988 and 1995,the quality of the environment declined in Liaohe.The biological diversity of the living environment in this area reduced,which caused a reduction of populations of some species even disappeared.But since 1995,landscape diversity and evenness increased,anti-jamming capability enhanced and the environmental quality improved.In a word,the impacts of human activity combining with natural conditions are the leading factors that induce dynamic change of the landscape pattern.
出处
《中国环境监测》
CAS
CSCD
北大核心
2011年第3期4-8,共5页
Environmental Monitoring in China
基金
国家水体污染控制与治理科技重大专项(2008ZX07526-001-02)
辽河河口区大型湿地生态修复关键技术与示范研究(2008ZX07208-009)
关键词
湿地
景观格局
景观指数
景观变化
大辽河口
Wetland
Landscape pattern
Landscape index
Landscape change
Liaohe
