Study on the Land Use/Cover Changes of Mangrove Reserve of Shenzhen Bay Based on Remote Sensing Date

Abstract

This study used the remote sensing data of the mangrove reserve of Shenzhen bay in five different times (including 1986, 1993, 2000, 2008 and 2012), extracted the characteristics of land use/cover and got the area data of different land use types. Comprehensive data analysis showed that: in the past 30 years the total area of the mangrove reserve of Shenzhen bay did not change, but the area of different land use types have been changing, where mangroves and terrestrial vegetation expanded year by year, increased by 37.49 hm2and 34.59 hm2respectively; waters and surrounded ponds shrinked by 35.33 hm2and 35.80 hm2, respectively; buildings and bare land changed little. The single speeds of five land types (mangrove, waters, surrounded ponds, terrestrial vegetation and buildings and bare land) is 2.7%, -0.63%, -1.72%, 10.47% and 0.75%, respectively; The comprehensive land use change in four time periods (1986-1993, 1993-2000, 2000-2008 and 2008-2012) were 1.59%, 0.53%, 0.71% and 0.57%, respectively, and the comprehensive index of land use degree in these five times were 2.53, 2.61, 2.62, 2.71 and 2.73, respectively, which showed a slow growth trend in 1986-2012. There has been an obvious mutual conversion between different land use/cover types, i.e., the increased area of mangrove mainly came from the waters and surrounded ponds, the reduced area of waters almost turned into artificial mangrove, and the reduced area of surrounded ponds mainly turned into terrestrial vegetation. However, the buildings and land area had no obvious mutual conversion relations with the other four land use types.