In order to scientifically evaluate the ecological quality of the land and effectively identify the main controlling factors of the land ecology, the authors established a remote sensing evaluation model based on ideal points in Guang’an which served as a research area, evaluated the ecological quality of the land in Guang’an in 2000, 2005, 2010 and 2015, and analyzed the main controlling factors. A kilometer grid was used as the evaluation unit. The evaluation index system was constructed based on the fourteen evaluation criteria in the four criterion layers, i.e., ecological background, ecological structure, ecological benefits and ecological stress. The evaluation index system was constructed by applying Delphi method and entropy weight method. The weight value of each evaluation index and the ideal point values were calculated by using the ideal point model, and the ideal point level was divided. The principal factor analysis method was used to obtain the main control factors of each year, and then the relationship between the spatial distribution of the ideal point level and the environmental impact factor was performed. Through research, the authors obtained the overall upward trend of land ecological quality in Guang’an City. It is shown that the proportion of land ecological quality at various levels of area and spatial distribution and the proportion of forest land area and temperature factor are the most important main control factors, and the proportion of woodland and the temperature are positively related to the land ecological quality. After analysis, the suggestions on land ecological quality supervision in Guang’an City are put forward. which can provide references for land ecological quality supervision in other areas.
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2021, Vol. 33 
), 夏学齐, 陈建平
