Abstract:

Dike-pond land as a featured ecological farmland is widely-spreading in the Pearl River Delta, but shows big changes both in quantity and spatial distribution in recent 20 years. Using of RS and GIS can monitor effectively the changes of dike-pond land in the Pearl River Delta. This paper, based on RS data in 1990, 2000 and 2008, applies object-oriented classification method, integrating spectrum, spatial relation and shapes to extract information of dike-pond land, with results indicating a rising trend during 1990 to 2000 but a sharp decrease during 2000 to 2008. From 1990 to 2008, the centrobaric of dike-pond migrated to NW. The added dike-pond land is most derived from farmland and grass-forest land, while the disappeared dike-pond land has been turned into urban construction land, vegetation land and farmland. This study shows a dynamic process in dike-pond land change. This paper presents a strategy for the sustainable development of dikepond land use, which provide references for comprehensive development and sustainable development of ecological agriculture in dike-pond land in Pearl River Delta.

Key words: RS, GIS, objectoriented, dikepond land, spatialtemporal change, Nanhai district

摘要：

基塘地是珠三角地区特有的一种生态农业用地类型，在珠三角地区广泛分布，近20年来基塘地在数量和空间分布上发生了较大的变化。利用遥感(RS)和地理信息系统(GIS)技术能有效监测珠三角地区基塘地的变化。本文应用1990年、2000年、2008年3个时相的遥感数据，采用面向对象的方法，综合光谱、空间关系和形状等特征信息对研究区的基塘地进行提取，结果表明，1990—2000年研究区的基塘地面积呈增长趋势，2000—2008年该地区的基塘地面积锐减。对研究区的基塘地重心变化进行分析，结果表明，1990—2008年基塘地呈现向西北方向迁移的趋势。观测期内研究区增加的基塘地主要来源于耕地和林草地，而减少的基塘地主要转化为城镇建设用地、植被和耕地。本研究客观、准确地反演了研究区基塘用地的动态变化过程，并提出了基于可持续发展理论指导下的基塘地发展策略，对珠三角的基塘地综合开发管理和生态农业可持续发展具有一定的理论和现实意义。

关键词: 遥感, 地理信息系统, 面向对象, 基塘用地, 时空变化, 南海区