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Spatio-temporal changes and driving factors of environmental and ecological index in Culai-Lianhua area |
Chao MA1,2, Panli CAI1,3 |
1. College of Surveying & Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China 2. Key Laboratory of State Bureau of Surveying and Mapping of Mine Spatial Information Technology, School of Surveying and Mapping Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China 3. College of Resources and Environment, University of Chinese Academy of Science, Beijing 100190, China |
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Abstract The strained human-land relationship in habitats which are isolated like islands inland, is an indicator sensitive to regional environmental changes as well as human activities. Based on image data obtained from Landsat MSS/TM/OLI (1982—2016), average annual precipitation and temperature data derived from meteorological stations (1982—2012), and DEM acquired by ASTER, the authors carried out time series analysis and correlation analysis of climate change factors (annual precipitation and temperature), human activity factors (area of cultivated and construction land) and specific remote sensing indexes including NDVI (normalized difference vegetation index) and NDBI (normalized difference building index) in Culai-Lianhua area. Some conclusions have been reached: The trend of vegetation degradation has been obvious in the past 35 years. It is clear that woodland and shrub have been transformed into grassland and sparse grassland, whereas grassland and sparse grassland have been transformed into bare land. The landscape pattern has changed. Woodland is surrounded by cultivated land and construction land. The woodland has been mixed with cultivated and construction land as well. The construction of the core area has made positive effect. In the core area, the growth rate of NDVI is 0.006 9/10 a and the NDBI has decreased at a rate of 0.014/10 a. On the contrary, around the core area, its NDVI has been speeding down at a rate of 0.018/10 a and the growth rate of NDBI is 0.003 5/10 a. The cultivated land has been greatly reduced, and mostly has been transformed into construction land and woodland. There exists a significant negative correlation between the change of woodland area and the change of cultivated and construction land area. In general, both the ecological structure and the landscape pattern have undergone adverse changes in Culai-Lianhua area.
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Keywords
Culai-Lianhua basin
isolated habitat
land use and land cover change(LUCC)
NDVI
NDBI
ecological pattern
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Issue Date: 03 December 2019
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