通过对深圳河河口地区6个时相卫星遥感图像的分析,得到了该地区10多年来红树林湿地面积的变化.通过对多时相红树林分布信息进行二进制编码,分析了不同时期红树林在空间上的消长,通过计算和对比各个时相红树林覆盖区域的植被指数,间接反映了红树林的生长状况的空间分布特征,并结合成像时刻的潮位数据进行了分析.结果表明:从1989年到1996年,深圳河河口红树林湿地面积总体上呈增长趋势,在1996年以后面积变化不明显而在空间分布上有变化.植被指数大的区域主要分布在多年被红树林占据的部位,深圳福田一侧的红树林空间消长化不显著,而主要的变化部分集中于香港米埔红树林保护区靠近深圳河河口的南侧.

With six phase of remote sensing images covering Shenzhen river estuary, this paper obtained the mangrove changes in the area over some 10 years. Coupled analysis of the image interpretation results and tidal data revealed that the mangrove increased in area from 1989 to 1996, and changed little from 1996 to 2000 in area but changed in spatial distribution. Binary coding was applied to the images for the distribution of mangrove at each phase, and the coded image revealed that the changes are mainly located at the Mipu mangrove conservation region that lies to south side of Shenzhen river mouth and is under Hongkong administration. Since the image in 1994 had best quality, the other 5 phase of images were recalibrated to that of 1994 with linear regressive method, and the normalize vegetation index was calculated for each phase. Though the results of NDVI can not compared because of different image acquisition time, all the six NDVI images showed that the NDVI values became large from the edge to center of the mangrove covered area.