Abstract
Analyzing the distribution characteristics and influencing factors of cultivated land in complex geomorphic areas is significant in evaluating the agricultural farming environment and formulating cultivated land protection measures. This study extracted cultivated land information based on multi-source remote sensing data, and analyzed the geomorphic differentiation of cultivated land distribution and climate response from 2000 to 2020 using the Gini coefficient, spatial autocorrelation analysis and geographic detector. The results show that cultivated land is mainly distributed in low-altitude hills and low-altitude small undulating mountains, and secondarily in low-altitude alluvial and proluvial plains and platforms. Moreover, from 2000 to 2020, the cultivated land in the high-altitude and high-altitude undulating mountains and medium and high-altitude undulating mountains in the Northwest Plateau of Sichuan showed an upward trend, while the cultivated land in the Sichuan Basin mainly increased from the north and south to the middle of the basin. In addition, the highest temperature has the strongest ability to explain the spatial heterogeneity of cultivated land. From the calculation results of the influence coefficient of a single climatic factor and the combined effect of multiple climatic factors, the main factors that affect the distribution of cultivated land are different in different geomorphological regions. Finally, it is proposed to formulate a long-term strategy for agricultural production to adapt to climate change in complex geomorphic areas in order to reduce the negative impact of environmental change on agricultural production.
Highlights
Cultivated land is one of the most important types of land use and is key to ensuring food security, ecological security, and regional development
In this study, based on the traditional basic geomorphic types of mountains and plains, the landforms are divided into seven categories according to geomorphic morphological characteristics and fluctuation height differences, and divided into 37 geomorphic areas according to five-level altitude
Characteristics of Cultivated Land Geomorphic Differentiation and Temporal and According to the analysis results of cultivated land distribution in the study area, cultivated land is mainly distributed in low-altitude hills, low-altitude small undulating mountains, and low-altitude alluvial, and proluvial plains in the Sichuan Basin
Summary
Cultivated land is one of the most important types of land use and is key to ensuring food security, ecological security, and regional development. Geomorphic characteristics largely determine the conditions of temperature, rainfall and moisture in the local environment, affecting the development, quality and distribution of cultivated land. It is of great theoretical and practical significance to explore the law of cultivated land differentiation at the scale of a geomorphological area, and to further excavate the response of cultivated land geomorphological differentiation to climate factors such as temperature, rainfall, humidity, and wind speed. Researchers have conducted many studies on regional and global cultivated land changes at different spatial and temporal resolutions [1,2]. At the regional and national level, the spatial resolution of the land use map has been improved to analyze cultivated land change. A 30-m resolution land use map was developed to analyze the Usangu basin [6], central and eastern
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