Based on geochemical study of soil, the authors discovered a new type of selenium-rich soil in northern plain of Zhejiang,which occurs discontinuously around the Taihu Lake. The content of selenium in soil is from 0.084 × 10 -6 to 1. 296 x 10 -6, with the average value being 0. 399 × 10 -6, the standard deviation being 0. 094, and the variation coefficient being 0. 037. Studies show that the soil organic matter is closely related to selenium, but not related to soil pH. Under the conditions of rich organic matter and oxidation, content of selenium in such agricultural products as rice, com, leafy vegetables, and beans is high. Further studies show that the source of selenium-rich soil is related to lake facies. On such a basis, a new type of selenium-rich soil is put forward.%通过对浙北平原土壤调查与研究,发现一种新类型富硒土壤,其特征为环太湖周边断续出现.土壤硒全量为(0.084～1.296)x 10(-6),平均值为0.399 x 10(-6),标准离差为0.037,变异系数为0.094;土壤有效硒与有机质关系密切,与土壤pH不相关;在土壤有机质丰富和氧化条件下,稻米、玉米、豆类和叶菜类等农产品富硒效果较好.进一步研究表明,该富硒土壤的形成与湖沼相沉积有关,据此提出湖沼相富硒土壤新类型.
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