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Abstract The deterioration of habitats caused by urbanization is an important reason for biodiversity loss. Based on Landsat TM/OLI images, DEM, digital maps and local climatic data from 1995 to 2015, the authors constructed the image interpretation system of Dongting Lake area, which was based on CART acquisition rules. According to the LUCC data obtained, the authors analyzed the spatio-temporal difference and correction of urbanization and avian habitat in Dongting Lake area, with the support of the software such as ENVI, ArcGIS, and MaxEnt. The results show that the classification method based on the CART algorithm for acquisition rule gained a higher precision than the ordinary classification method. The construction land in lake area increased by 808.61 km 2 in 20 years, the high-intensity expansion area was spread from the urban center to the county-level city, and the expansion rate gradually decreased after 2005. In the past 20 years, the suitable habitat area of waterfowls has decreased by 195.19 km 2, and the overall suitability of this area has been declined. However, the situation has gradually improved since 2000 with the government’s efforts to rectify the environment. The results of polynomial fitting and spatial comparison indicate that rapid and disorderly expansion of township construction land has reduced the suitability of avian habitats in lake area, and that, to protect avian habitats, people should take effective measures to protect the ecological land around there and rationally plan and control the expansion of construction land in towns and village areas.
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Keywords
Dongting Lake
CART decision tree
urbanization
avian habitat
spatio-temporal difference
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Corresponding Authors:
QI Zengxiang
E-mail: 1341438323@qq.com;qizengxiang@126.com
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Issue Date: 09 October 2020
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