农产品硒含量及与土壤硒的关系

植物硒是人类硒的主要来源。分析不同类型气候和土壤条件下，主要农产品的硒含量和富集能力，对于发展富硒农产品具有重要实践价值。本研究选择中国南方丰城和北方博山两类不同硒含量地区，对土壤和当地所生产的农作物产品进行采样分析。结果表明，土壤硒含量整体较高，是造成丰城地区同类农产品硒含量高于博山地区的主要原因，但并不是所有农产品硒含量与土壤硒呈正相关关系。丰城和博山地区的各类农产品中，韭菜硒含量最高，高于十字花科的小白菜和白萝卜，以及禾本科的玉米、小麦和水稻，后两类作物硒含量高于花生和大豆，辣椒和甘薯最低。博山地区中性和碱性土壤中，作物硒富集系数普遍高于丰城地区酸性土壤所生产的作物。区域富硒农业发展过程中，应针对性选择合适的作物品种，并根据当地的自然和土壤硒水平，制定相应的发展方案。

Selenium Content in Agricultural Products and Its Relationship with Soil Selenium

Selenium (Se) in plants is an important source of human Se. The analysis of Se content and enrich?ment ability in major agricultural products under different weather patterns and soil conditions has practical value for the development of selenium-rich agricultural products. The authors analyzed the Se content of soil and agricultural products in two regions with different Se levels, i.e., Fengcheng in southern China and Boshan in northern China. The results showed that: Se content of agricultural products in Fengcheng tended to be high?er than that in Boshan, which could be attributed to the higher soil Se content in Fengcheng; but the relation?ships between Se content of products and soil Se were not always significantly positive among various kinds of crops; the Se content of agricultural products in the two regions showed to be Chinese chive>pakchoi and dai?kon>maize, wheat and rice>peanut and soybean>chili and sweetpotato. Se enrichment factor of agricultural products exhibited to be higher in neutral and alkaline soils than in acidic soils. Crop species and background soil Se level should be fully considered in the process of regional Se-rich agriculture development.