Research on Comprehensive Evaluation and Utilization of Selenium-rich Land Quality in Tunliu District, Shanxi Province, China

Carrying out land survey and evaluation and developing characteristic industries is an important work to realize rural revitalization and consolidate the results of poverty alleviation. In order to more accurately and effectively guide the regional agricultural production layout and the development of specialty industries, this paper selects the indicators of selenium-rich industry quality, ecological environment and arable land strength to construct a comprehensive quality evaluation system of selenium-enriched land, and carries out selenium-enriched land evaluation in Tunliu District, Changzhi City, Shanxi Province. Fuzzy mathematical method, entropy weight method and comprehensive index method were applied to evaluate and classify the land. The results show that: ①54.47% of high selenium and selenium-suitable soils in Tunliu District are concentrated in the eastern part of the district; the distribution of arable land strength grade is uneven, with the whole being low in the west and high in the east; and the ecological condition of the whole region is clean. ②The area of first-class selenium-rich land in the region is 299.33 square kilometers, accounting for 26.61%, concentrated in the eastern plains. ③Wheat, sharp pepper and green pepper in Tunliu District have reached the standard of selenium enrichment, and the rate of selenium enrichment of sharp pepper is 100%, and the crops are in good clean condition. Based on the evaluation results, combined with the territorial spatial planning of Tunliu District, three types of land are divided: Class A land (selenium-enriched and fertilized and clean) is planned for planting selenium-enriched wheat and green vegetables, and at the same time, developing tourism agriculture; Class B land (selenium-appropriate and clean) is planned for planting selenium-enriched peppers, and at the same time, developing deep-processing of agricultural products; and Class C land (not selenium-enriched and fertilized) is built to create a system of deep-processing of agricultural products, and at the same time, developing agricultural trade and tourism. This paper provides theoretical support and scientific suggestions for the planning of selenium-enriched agriculture industry in Tunliu District as well as regional synergistic development.