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Arid Land Geography ›› 2022, Vol. 45 ›› Issue (5): 1591-1603.doi: 10.12118/j.issn.1000-6060.2022.346

• Regional Development • Previous Articles     Next Articles

Change of ecological environment in Turpan and Hami cities based on remote sensing ecology index

WANG Jinjie1,2,3(),DING Jianli1,2,3(),ZHANG Zipeng1,2,3   

  1. 1. College of Geographical and Remote Sciences, Xinjiang University, Urumqi 830017, Xinjiang, China
    2. Xinjiang Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi 830017, Xinjiang, China
    3. Key Laboratory of Smart City and Environment Modelling of Higher Education Institute, Urumqi 830017, Xinjiang, China
  • Received:2022-07-10 Revised:2022-07-28 Online:2022-09-25 Published:2022-10-20
  • Contact: Jianli DING E-mail:wangjj@xju.edu.cn;watarid@xju.edu.cn

Abstract:

It is important to make an objective and comprehensive evaluation of the quality of the ecological environment for ecological civilization construction. Using four indicators of humidity, dryness, heat, and greenness, the remote sensing ecology index (RSEI) was established and plotted to characterize Turpan and Hami cities of Xinjiang, China in 2000, 2006, 2012, and 2018, based on the multispectral sensor, moderate resolution imaging spectroradiometer. Additionally, the ecological environment quality and land use conversion in the region were quantitatively analyzed. The spatial-temporal variation changes in the ecological environment and land use in Turpan and Hami cities were analyzed and evaluated using the principal component analysis method to construct remote sensing ecological indices and statistical analysis. The results show that in the past 20 years, the greenness index of Turpan and Hami cities has increased by 0.0244 on average, the heat index has decreased by 0.0241 on average, and the overall changes in humidity and dryness index are close to 0. Among them, the heat index has the strongest negative correlation with RSEI. In general, the eco-environmental quality of Turpan and Hami cities showed a slight downward trend from 2000 to 2018. Among them, the change range of RSEI in Shanshan County of Turpan City was the largest, and the environmental quality decreased the most, while the range of the decrease in environmental quality in Barkol Kazak Autonomous County of Hami City was the smallest. Although the grassland area in this area has expanded significantly in the past 20 years, it is still necessary to control grassland reclamation and overgrazing in the future.

Key words: remote sensing ecology index, MODIS data, spatial-temporal variation, Turpan City, Hami City