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MODIS-based comprehensive assessment and spatial-temporal change monitoring of ecological quality in Beijing-Tianjin-Hebei region |
ZUO Lu1,2( ), SUN Leigang1,2,3( ), LU Junjing1,2, XU Quanhong1,2, LIU Jianfeng1,2, MA Xiaoqian1,2 |
1. Institute of Geographical Sciences, Hebei Academy of Sciences, Shijiazhuang 050021, China 2. Hebei Engineering Research Center for Geographic Information Application, Shijiazhuang 050021, China 3. Julu Institute of Applied Technology, Xingtai 055250, China |
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Abstract Ecological quality assessment is an important prerequisite for guaranteeing the harmony and stability of the production and life of human beings and the ecological environment and for achieving the sustainable development of regional social economy. It has become a new trend to quickly, accurately, and objectively assess the regional ecological quality using use remote sensing technology. This study used the MODIS data of the Beijing-Tianjin-Hebei region in 2001, 2010, and 2019 to extract four important indices, namely, NDVI (greenness), LSM (humidity), NDBSI (dryness), and LST (heat). Then, this study obtained the MODIS remote sensing ecological index (RSEIM) using the principal component analysis method to conduct a comprehensive assessment and change monitoring of the ecological quality in the Beijing-Tianjin-Hebei region over the past 20 years. The results are as follows. ① The ecological quality of the Beijing-Tianjin-Hebei region shows distinct regional differences. The Yanshan Mountain in the north and the Taihang Mountain in the west have high ecological quality, while the Zhangjiakou area in the northwestern part of Hebei Province and the urban center in the southeastern part of Hebei Province suffer low ecological quality. ② In 2001, 2010, and 2019, the average RSEIM of the Beijing-Tianjin-Hebei region was 0.556, 0.583, and 0.527, respectively, with the overall ecological quality showing a downward trend. ③ From 2001 to 2019, the area with improved and degraded ecological quality in the Beijing-Tianjin-Hebei region accounted for 20.18% and 35.69% respectively, and the ecological quality in this region showed a pattern of improvement in the northwest and degradation in the southeast. The main reasons for the ecological improvement in the northwestern part of the region are the changes in water and heat conditions, such as an increase in precipitation and temperature, and a series of man-made protection measures. The reasons for ecological degradation in the southeastern part of the Beijing-Tianjin-Hebei region mainly include the rapid advancement of urbanization and the enhancement of social and economic activities. The comprehensive assessment of regional ecological quality can be effectively achieved based on MODIS data, thus providing a reference for the green and high-quality development of regional social economy.
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Keywords
ecological quality
comprehensive evaluation
remote sensing monitoring
MODIS
spatial-temporal changes
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Corresponding Authors:
SUN Leigang
E-mail: zuol.14b@igsnrr.ac.cn;sunleigang3s@163.com
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Issue Date: 20 June 2022
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