This paper is the result of agricultural geological survey engineering.[Objective]The study aims to delineate the distribution characteristics and geological origins of selenium in the soil of the Chengde area,providing a scientific foundation for the exploration and effective utilization of selenium in the region's soils.[Methods]Geological surveys were conducted to identify the types of soil parent materials in the area.The content of selenium and multiple elements in 553 soil samples and 66 rock/ore samples were determined using X-ray fluorescence spectrometry,inductively coupled plasma emission spectrometry,and the Kjeldahl nitrogen method.Data analysis was performed using SPSS software,with geological genesis being interpreted in conjunction with geological processes.[Results]The soil parent materials in the Chengde area are categorized into nine distinct groups.The selenium content in surface soils ranges from a minimum of 0.016 mg/kg to a maximum of 0.743 mg/kg,with an average value of 0.17 mg/kg.This average selenium content is half of the national average,indicating a state of deficiency.The average selenium content in iron ore,gold ore,and lead-zinc ore are 0.860 mg/kg,1.233 mg/kg,and 3.365 mg/kg,respectively,significantly higher than those in the tailings and wall rocks associated with various ores.[Conclusions]The overall selenium content in the soils of Chengde is very low,primarily determined by the soil parent materials,with distribution patterns influenced by geological formations.Selenium-rich soil areas are notably concentrated in the south of Longhua County(Area A),the southern parts of Chengde City(Area B)including Shuangluan and Shuangqiao districts,and the eastern part of Kuancheng County(Area C).Area C is characterized as"rock weathering type",associated with the presence of selenium-enriched primary carbonate rocks and carbonaceous mudstones.Area B is classified as"mineralization associated type",linked to the symbiotic relationship between selenium and metal sulfides during lead-zinc mineralization,as well as the substitution relationship between selenium and sulfur.Area A is defined as"river sedimentary type",relating to the dynamics of river and lake sedimentation and the adsorption by organic matter.The selenium-rich region in southern Chengde possesses a natural advantage for developing a forest and fruit economy.Weichang County,situated in a low selenium environment,is identified as a contributing factor in the prevalence of Keshan disease and other endemic conditions.
关键词
土壤硒/分布特征/相关性分析/地质成因/农业地质调查工程/承德市/河北省
Key words
soil selenium/distribution characteristics/correlation analysis/geological genesis/agricultural geological survey engineering/Chengde/Hebei Province
维普
万方数据