Change monitoring of aquaculture ponds on the west bank of Ha Long Bay based on remote sensing technology and analysis of its impact on production-living-ecological land
CHEN Wangmeng, LI Tong, ZHANG Li, ZHANG Hongri, YAN Min, DU Yuefei
2020, 0(9):
66-71.
doi:10.13474/j.cnki.11-2246.2020.0285
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Ha Long Bay is a large aquaculture area in northern Vietnam. With the expansion of the scale of aquaculture land, the spatial pattern of the surrounding production-living-ecological land (production land, living land, ecological land) is affected. Five coastal areas on the west bank of Ha Long bay are taken as the study area, and four cloud-free Landsat TM/OLI remote sensing data in 1990, 2000, 2010 and 2015 are used to monitor the land use change from 1990 to 2015 by classification and regression tree method. Based on the land use net change amount and the land use dynamic degree model, the spatial-temporal evolution pattern of the aquaculture ponds and its impact on the production-living-ecological land are quantitatively analyzed. The results show that: ① During 25 years, the area of aquaculture ponds showed a “single peak” type of increase and then decrease, with a net increase of 66.65 km2. In 2000, the area is 156.65 km2, an increase of 113% compared with 1990. Compared with 2000, the area is reduced by 11% in 2015. Overall, it has the variation characteristics of the area change of “increasing from north to decreasing in south” in quantity and “slowing from east to west in speed”. ② In the transfer area of the aquaculture ponds, the area transferred from production land to aquaculture ponds accounts for 31%, living land accounts for 4%, and ecological land accounts for 65%. The spatial pattern as a whole is bounded by the Bai Teng River and the central axis of the land, showing the rule of inward and outward movement between the north-south division and the east-west boundary. ③ The aquaculture ponds occupy 7.24 km2 of domestic land, and the two have a positive correlation, R2 is 0.46; the aquaculture ponds occupy production and ecological land areas of 55.14 and 115.14 km2, respectively, and have a negative correlation with the two, R2 is -0.96 and -0.81. The use of remote sensing technology to monitor the temporal and spatial changes of aquaculture ponds is of great significance to the planning and configuration and sustainable development of land resources.
