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Geoscience ›› 2020, Vol. 34 ›› Issue (06): 1318-1332.DOI: 10.19657/j.geoscience.1000-8527.2020.06.19

• Geochemistry • Previous Articles     Next Articles

Research of 1∶50,000 Land Quality Geochemical Assessment at Yanjin County in Yunnan Province

YANG Fan1,2,3(), ZHANG Shunyao1,2,3(), SONG Yuntao1,2,3, WANG Huiyan1,2,3, HAN Wei1,2,3, GUO Zhijuan1,2,3, PENG Min1,2,3, WANG Chengwen1,2,3, CHEN Ziwan4, BAI Bing4   

  1. 1. Research Center of Geochemical Survey and Assessment on Land Quality,China Geological Survey, Langfang, Hebei 065000, China
    2. Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth’s Critical Zone,Chinese Academy of Geological Sciences, Langfang, Hebei 065000, China
    3. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang, Hebei 065000, China
    4. Yunnan Institute of Geological Survey, Kunming, Yunnan 650216,China
  • Received:2020-02-05 Revised:2020-08-13 Online:2020-12-22 Published:2020-12-22
  • Contact: ZHANG Shunyao

Abstract:

Controlling the quality and quantity of land resources, development and utilization of special land resources, farmland protection and the management of ecological protection are very important in the construction of ecological civilization. A research on the assessment methods of 1∶50,000 land quality geochemical survey at Xinglong, Luoyan and Niuzhai of Yanjin county in Yunnan province was carried out. The soil samples were collected at a density of 9.17 samples/km2. The distribution of nutritive elements and heavy metal elements, and the comprehensive quality of soil in the study area were studied. For delineating special land resources, the national standard of green food-environmental quality for production area and pollution-free agricultural products-environmental quality for production area were tentatively applied in this study. Research on farmland protection planning was carried out, according to the soil pollution controlling action program enacted by State Council of the People’s Republic of China. Results show that 72.88 percent of the study area and 69.17 percent of the cultivated land area are assessed above three-class as shown in the national standard of specification of land quality geochemical assessment. Selenium-enriched land with area of 191.73 km2, that is accounting for 75.53 percent of the total study area,is discovered. Selenium-enriched farmland and garden plot with area of 66.84 km2 are discovered, accounting for 70.92 percent of the total cultivated land and garden plot area in the study area. The farmland and garden plot that meet requirements of production area of the green food and pollution-free agricultural products are distinguished, and the area are 11.60 km2 and 11.76 km2, respectively. The farmland and garden plot are marked out as priority reserve area, security utilization area and strict control area, with the area of 65.57 km2, 21.67 km2, 7.00 km2, and accounting for 69.59, 22.98 and 7.43 percent of the total farmland and garden plot area in the study area, respectively. These results could be used to the land resource management, agricultural structure adjustment, soil environmental protection and po-verty overcoming for the local government. It also could be used as a reference for improving the utilization degree and achievement transformation of land quality geochemical assessment results. It is of great significance to enrich and perfect the system of land quality geochemical assessment.

Key words: geochemical assessment of land quality, selenium-enriched land, green food, nuisance free agricultural product, cultivated land

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