本文应用遥感、GIS技术和景观指数方法，对广州市天河区水域景观动态演化进行了研究.得出：①近20年来，广州市天河区水域景观斑块数量(NP)、总面积(TA)、平均斑块面积等数量特征参数均减小，表明水域景观呈现退化趋势；②广州市天河区水域景观内部结构中，斑块密度(NP)和平均斑块最近距离(MNN)增加、斑块聚合度(AI)减小，表明水域景观由团聚分布转向分散分布，斑块破碎化程度增大；③平均斑块形状指数(SHAPE_MN)、平均斑块分维数(FRAC_MN)降低、最大斑块指数(LPI)增大，表明水域景观斑块形状由不规则转向规则，人类活动影响频率加强.④引起天河区水域景观变化的原因既有自然因子，也有人为因子，其中人为因子为主要因素.根据研究结果进一步提出了相关建议和对策，为广州市建设生态城市，保障城市生态安全的管理决策提供参考.% Regional ecological security is the foundation for sustainable development, and the waterscape are of vital importance for maintaining regional ecological security. By using the technology of GIS/RS、and FRAGSTAT, the dynamic evolution of the waterscape in TianHe is analyzed. The results are as follows:(1) In the past two decades, the characteristic values, such as the total, average、maximum and minimum areas of the waterscapes in TianHe are in a gradual reduction trend;(2) Some characteristic indexes (NP AI MNN) indicting internal structure of waterscape in 2008 are all smaller than 1988's, which show the pattern of waterscape change from aggregation to scatter, and the extent of waterscape fragmentation turns increased; (3) another indexes such as SHAPE_MN, FRAC_MN decreased, meantime, LPI increased, which demonstrating the shape of waterscape get regular for more and frequent human activities' interference;(4) the driving force resulting in the dynamic evolution of the waterscapes include both natural and artificial factors, but the artificial factors are the main thrust. According to the conclusions, some sugges-tions are put forward in order to construct ecological city, making sure the maintenance of the ecological security in Tianhe of Guangzhou.
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