结合遥感与地理信息系统技术,采用多时相遥感卫星影像提取广西廉州湾1990、1998、2004、2008和2015年红树林空间分布信息,并从整体景观尺度(面积变化)、像元尺度(多时相信息二进制编码)以及斑块尺度(景观指数与景观分布质心)定量分析红树林的时空变异特征。结果表明,1990－2015年红树林面积呈“增长—下降—增长”特征,2015年达到734.36 hm2；1998－2015年红树林呈消长分布,时空变异程度大；近25 a来红树林斑块数不断增加,平均斑块面积减少,景观破碎化加剧,景观分布质心向研究区东南部偏移。基于多时相遥感影像能快速获取红树林的时空变异特征,有助于红树林调查的科学安排及其保护与管理。%With remote sensing and geographical information system techniques, multi￣temporal remote sensing images were employed to extract the spatial distribution of mangrove in Lianzhou Gulf, Guangxi in 1990, 1998, 2004, 2008 and 2015. The temporal and spatial variations of mangrove were quantitatively analyzed at the scales of landscape ( area change ) , pixel ( multi￣temporal binary coding method ) and patch ( landscape indices and center￣of￣mass coordinate of landscape ) . The results showed that the area of mangrove tended to“increase￣decline￣increase” from 1990 to 2015, and the area was 734.36 hm2 in 2015. The spatial distribution of mangrove expanded and shrank over 1998-2015 with fluctuant temporal and spatial variations. During 1990-2015, the total patches of mangrove tended to increase, the average patch area declined, the landscape fragmentation intensified, and the center￣of￣mass of mangrove landscape tended to shift to the southeast of Lianzhou Gulf. The temporal and spatial variation of mangrove can be quickly acquired with multi￣temporal remote sensing images, facilitating the scientific arrangement of mangrove investigation as well as protection and management of mangrove.
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