九龙江口湿地景观格局变化遥感监测与分析

An analysis on change of wetland landscape in Jiulong river estuary based on multi-temporal remote sensing images under background of urbanization

选择九龙江口地区为研究区,以1988、1998、2009年三个时期的TM和ALOS多源多时相遥感影像为主要数据源,结合其他辅助资料,提取了三个时期的湿地景观格局及变化信息,分析城市化背景下九龙江口湿地景观格局的演变特点和驱动力.研究表明:九龙江口湿地面积在近二十年内下降趋势明显,湿地总面积从1988年的34 784.7 hm2下降到2009年的20 775.6 hm2,主要体现在天然湿地的萎缩和向人工湿地的转化.具体表现在水稻田逐渐被养殖场以及建筑用地所取代.快速城市化使得九龙江口湿地景观破碎度和斑块密度增大,湿地生态脆弱性趋势明显.

This paper took Jiulong river estuary as an example,using multi-temporal and multi-source remote sensing data from Landsat TM and ALOS and other auxiliary data.In this study,a decision tree based classification method is used to extract wetland landscape pattern and change information from multisource and multitemporal remote sensing images during three times.The pattern of wetland landscape and its driving force in the Jiulong river estuary from the urbanization was analyzed.The result shows that wetland area in Jiulong river estuary declined significantly in the past twenty years.The total area of wetland decreased from 34 784.78 hm2 in 1988 down to 20 775.69 hm2 in 2009,the changement resulted mainly from rice fields,which have been gradually replaced by farms and building-up under rapid urbanization,making the Jiulong river estuary landscape fragmentation and patch density increases.