Abstract:

It is of great significance for the cultivated land differentiated utilization and agricultural sustainable development to clarify farmland quality grade and obstacle factors. In this paper, the soil of farmland in Arong Banner was the research object, GPS was used for fixed-point information collection, and the weights and membership of each index were calculated by expert scoring and hierarchical analysis. And a soil fertility grade evaluation system with 16 indicators as the core was constructed, which studied cultivated land grade and quantitative obstacle factors, and the land distribution and the main obstacle factors of cultivated land at each grade were analyzed. The results showed that the cultivated land could be divided into eight grades according to the comprehensive index range of cultivated land quality grade (IFI value). The area of first to fourth class cultivated land accounted for 95.70% of the total cultivated land area of Arong Banner. Microbial diversity, irrigation and drainage capacity and forest network were the main obstacles to agricultural production in this region. In order to improve the production capacity of cultivated land in the black soil area of Arong Banner at the southern foot of the Daxing’an Mountains, the protection of cultivated land from grade one to four should be taken into account. The area of fifth to eighth class cultivated land only accounted for 4.30%. Technical modes such as converting farmland to grass or forest or grain and grass rotation could be implemented to restore the ecological environment and improve the fertility of cultivated land in fifth to eighth class cultivated land.

Key words: the southern foot of the Daxing’an Mountains, black soil cultivated land, evaluation index system, cultivated land quality grade, obstacle factors