STUDY ON THE CHANGE OF ECOLOGICAL ENVIRONMENT IN ZHENGZHOU BASED ON RSEI.

With the rapid development of urbanization, the urban ecological environment is facing severe challenges. Taking the urban area of Zhengzhou as the study area, the Landsat remote sensing images of 1995, 2000, 2005, 2010, 2015 and 2020 were selected to extract the indexes of humidity, greenness, heat and dryness respectively. The principal component analysis method was used to construct the remote sensing ecological index RSEI (remote sensing ecological index) model to quantitatively evaluate and monitor the ecological environment of Zhengzhou in the past 25 years, and analyze the reasons. The results showed that from 1995 to 2020, the urban ecological environment quality of Zhengzhou decreased slowly in chronological order, and the ecological quality first decreased and increased slightly, then increased slowly, and then tended to be stable after a large decrease. From the perspective of spatial sequence, the ecological deterioration area of Dengfeng City under the jurisdiction of Zhengzhou has been restored in a large area, the ecological environment of the built areas of the central area, Gongyi City and Xinzheng City is still not optimistic, and the eco-environmental quality of other areas is basically stable. By analyzing the relationship between RSEI index and the area of built-up area and the intensity of human activities, it is determined that the decline of urban eco-environmental quality must be related to the increase of built-up area, and the intensity of human activities has a certain impact on the quality of ecological environment. [ABSTRACT FROM AUTHOR]