| Citation: | WANG Daying，CUI Xinyu，CAO Peili，et al. Research on comprehensive evaluation and utilization of selenium-rich land quality in Tunliu District, Shanxi Province, China[J]. Bulletin of Geological Science and Technology，2025，44（0）：1-15 doi: 10.19509/j.cnki.dzkq.tb20230666
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Carrying out land surveys and evaluations and developing special industries is a very important task for China to realize rural revitalization and consolidate the results of poverty alleviation. In order to more accurately and effectively guide regional agricultural production layout and specialty industry development, a selenium-rich land survey and evaluation was conducted in Tunliu District, Changzhi City, Shanxi Province, China.
Therefore, the indicators of selenium-rich industry quality, ecological environment and arable land strength were selected to construct a comprehensive quality evaluation system for selenium-rich land, and then fuzzy mathematical method, entropy weighting method, and composite index method were applied to evaluate and grade the land in the study area, and ArcGIS was used to implement the results.
The results show that: ① the land with soil selenium content grades of high selenium and moderate selenium in Tunliu District accounted for 54.47% of the statistical area, and these soils were concentrated in the eastern part of the district; the distribution of cultivated land strength grades in Tunliu District was uneven, and the overall characteristics showed that it was low in the western part and high in the eastern part; the results of the evaluation of ecological environment grades were clean in the whole district. ② There are 299.33 square kilometers of selenium-enriched land in Tunliu District with comprehensive quality grade of first class, accounting for 26.61% of the statistical area, and concentrating in the plain area in the east. ③ Wheat, sharp peppers and green peppers in Tunliu have reached the standard of selenium enrichment of crops. Among them, the selenium enrichment rate of sharp peppers is 100%. In addition, the results of heavy metal element testing show that the crops in the district are in good clean condition.
Based on the evaluation results of land and crops, and in conjunction with the spatial planning of land in Tunliu District, the land is divided into three types: A, B and C. Among them, type A land is characterized by high soil selenium content, rich nutrients and clean environment, so it is recommended to build selenium-enriched wheat and green vegetable planting bases in the area where this type of land is concentrated and develop tourism agriculture at the same time. Class C land is characterized by low soil selenium and nutrient content, which is unsuitable for planting crops, so it is recommended to build deep-processing factories for agricultural products in the areas where this type of land is concentrated, and to develop agricultural trade and tourism at the same time. It provides theoretical support and scientific suggestions for the planning of selenium-rich agriculture industry in Tunliu District and the synergistic development of the region.
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