四川省屏山县土壤硒地球化学特征及影响因素

Geochemical characteristics and influencing factors of soil selenium in pingshan of Sichuan Province

通过对屏山县土壤、岩石和水稻样品的系统采集,测定了它们的硒含量,研究该地区硒的地球化学特征,探讨土壤富硒来源和影响因素,查明当地富硒水稻的开发利用前景.结果表明,表层土壤总硒量范围为0.046—1.270 mg·kg^(-1),平均含量为0.240 mg·kg^(-1).研究区为富硒和足硒土壤分别占总面积的15.95%和52.96%,主要分布在三叠系和侏罗系地层.垂向剖面上,土壤硒表层富集.成土母质、土壤p H值、有机质和Fe、Mn的含量对Se的地球化学行为有重要影响.超过51%的水稻硒含量已达到现有的富硒农产品含量标准要求,具有广阔的开发富硒农产品前景.

Through systematic sampling of different types of soils,rocks and rice and selenium analysis,geochemical characteristic of selenium,source of selenium in soils,influencing factors,and prospects of selenium-enriched rice in this area were investigated. The results show that the content of selenium in surface soil was from 0. 046 to 1. 270 mg·kg（-1）,with an average value of0.240 mg·kg（-1）. The selenium-full and selenium-rich soil occupies about 15.95% and 52.96% of the study area,respectively and mainly distributed in the stratum of Triassic and Jurassic. The selenium was concentrated at the surface of these ten soil profiles. Soil parent rock,p H,organic matter,the contents of Fe and Mn played important roles in the geochemical behaviors of selenium. The selenium content in more than 51% rice samples reached the required standard for selenium-riched agricultural product,indicating an alluring prospect for the development of selenium-enriched agricultural products in this region.