贵州省贵阳市耕地土壤硒元素地球化学特征与富硒资源评价

Farmland Soil Element Selenium Geochemical Features and Selenium-rich Resources Assessment in Guiyang City, Guizhou Province

依托第一次贵州省耕地质量地球化学调查评价成果,通过广泛收集相关地质、环境、土壤调查等资料,分析区内1∶5万耕地质量地球化学采集的24 114件表层土壤及668件农产品样品,评价全区硒元素地球化学等级。结果表明:全区耕地土壤硒元素含量总体较高,为0.08~8.96mg/kg,平均含量为0.62 mg/kg,中值为0.54mg/kg,均高于0.4 mg/kg的富Se土壤标准,且含量值受地质背景特征影响较大;全区富硒耕地资源丰富,超300万亩,占总耕地面积80%以上;区内农产品富硒效果较好,以茶叶、油菜籽最优,富硒率超95%;大宗作物水稻富硒效果也较好。发展本土富硒农产品产业前景广阔。

On the basis of the first Guizhou Province farmland quality geochemical investigation assessed results, through extensive collection of corresponding geological, environmental and soil investigation data have analyzed the area’s 1:50,000 farmland qualities geochemical investigation acquired 24,114 topsoil and 668 crops samples, also assessed whole area element selenium geochemical grade. The result has shown that whole area farmland soil selenium content is higher as a whole, between 0.08~8.96 mg/kg, average 0.62 mg/kg, median 0.54 mg/kg, all higher than the selenium-rich soil standard 0.4 mg/kg;the value is largely affected by geological setting features. The area has abundant selenium-rich farmland resources, exceeded 3 million mu(mu, Chinese land area unit, 1 mu equals 666.7 square meters), account for farmland total 80% above. Crops selenium-rich effect is better, especially tea and rapeseed, selenium-rich rate can be above 95%, staple crop paddy rice also better. To develop local selenium-rich crops industry has wide prospects.