Abstract:

The temporal and spatial characteristics of the dominant transformation of cultivated land use in Danjiangkou City were studied to provide scientific basis for sustainable development and rational development of county cultivated land. Based on the land change survey data of four periods from 2009 to 2021, land use transition matrix, contribution rate, amplitude and velocity models of cultivated land change were constructed to reveal qualitative and quantitative spatio temporal change characteristics of cultivated land quantity form and spatial form from the dominant perspective. The results showed: From 2009 to 2021, the amount and form of cultivated land use transformation in Danjiangkou City changed greatly, with a net decrease of 10 900.73 hm² (30.16%). In terms of time segments, the conversion area of cultivated land in Danjiangkou City during 2017-2021 was the largest, which was as high as 10 323.43 hm². In Danjiangkou, the change amplitude and speed of cultivated land morphology were significantly different in space, and the change amplitude was concentrated in the villages and towns around the western part of Danjiangkou, while the areas with large change velocity were mainly distributed in the eastern and northern parts of Danjiangkou. The spatio temporal characteristics of the dominant transformation of cultivated land use in Danjiangkou City from 2009 to 2021 have some regular differences, which is of great significance for the identification of the transformation of cultivated land use in counties and the appropriate adjustment of cultivated land use.

Key words: cultivated land, dominant transformation, contribution rate, Danjiangkou City