贵州省土壤硒含量背景值研究

以贵州省耕地表层土壤（0～20 cm）为研究对象，系统采集了454 431件土壤样品，分析测试了土壤硒含量，讨论了贵州省耕地表层土壤硒含量及其分布特征，以及不同土壤类型、不同酸碱度、不同地类土壤的硒含量背景值。结果表明，贵州省耕地土壤硒含量背景值为0.482 mg/kg，变化范围为0.179～1.295 mg/kg。与中国农耕区表层土壤硒含量平均值（0.217 mg/kg）相比，贵州省耕地土壤硒含量处于较高水平，为发展富硒农业产业提供了有力支撑。不同土壤类型中棕壤土的硒含量背景值最高（0.591 mg/kg），紫色土的硒含量背景值最低（0.363 mg/kg）。不同酸碱度土壤中，强酸性土壤硒含量背景值最高（0.562 mg/kg），强碱性土壤硒含量背景值最低（0.246 mg/kg）。不同地类土壤中，茶园土壤硒含量背景值最高（0.554 mg/kg），水田土壤硒含量背景值最低（0.414 mg/kg）。

Study on the Background Value of Soil Se Content in Guizhou Province

Taking the surface soil (0-20 cm) of cultivated land in Guizhou Province as the research object, 454 431 soil samples were collected systematically and been tested for the content of selenium (Se), in addition, the distribution characteristics of Se content, and its background value in different soil types, its dependence on soil pH and land types were also explored. The results show that the geometric mean of Se content in soil samples in Guizhou province is 0.482 mg/kg, and the range is 0.179-1.295 mg/kg. Compared with the average surface Se content in Chinese farming areas (0.217 mg/kg), the Se content in cultivated land in Guizhou Province is at a higher level, which provides a strong support for the development of Se-rich agriculture in this province. Among different soil types, brown soil has the highest background value of Se content (0.591 mg/kg), and purple soil has the lowest background value of Se content (0.363 mg/kg). Among soils with different pH levels, the background value of Se content in strongly acidic soil is the highest (0.562 mg/kg), and the background value of Se content in strongly alkaline soil is the lowest (0.246 mg/kg). Among different types of soil, the background value of Se content in tea garden soil is the highest (0.554 mg/kg), and the background value of Se content in paddy soil is the lowest (0.414 mg/kg).