Purpose Our aim was to understand the utilization of arable land in the plateau lake basin and to provide a scientific basis for the protection of arable land, the optimization of agricultural structure and the improvement of ecological environment.
Method Based on the methods of spatial analysis and statistical analysis, the spatial distribution characteristics of arable land quality grade in Dianchi Lake, Erhai Lake and Fuxian Lake were studied on different scales.
Result (1) From the perspective of the basin scale, the arable land natural quality grades in Dianchi Lake basin are mainly composed of 7-9 and 13-15, grade is dominated by medium rank; the arable land natural quality grade in Erhai Lake basin is mainly composed of 6-7 and 14-15, low grade, medium grade and high grade distributions are not much different; the arable land natural quality grade in Fuxian Lake basin is mainly composed of 8-9 and 15-16, grade is dominated by medium rank. (2) From the county scale, the arable lands of Dianchi Lake, Erhai Lake and Fuxian Lake basins are mainly distributed in the main city of Kunming, Dali City and Chengjiang County, the highest average grade of the districts and counties are the main city of Kunming (12.6), Binchuan County (15.9) and Jiangchuan County (11.8).
Conclusion The arable land natural quality grades of three lake basins are " double peak” features, peak range mainly in the 6-9, 13-16, valley range is mainly between 10-12, low grade, medium grade and high grade distribution even more uniform in Erhai Lake basin, the other two major lake basins are mainly medium grade; Medium grade and high grade mostly distribute in the gentle slope hills or valley and dam area.
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