广西百色市不同成土母质地区富硒土壤标准探讨

Discussion on the criterion for selenium-rich soil in different soil-forming parent material areas in Baise City of Guangxi

成土母质是土壤形成的基础,是影响土壤硒含量的最重要因素,不同成土母质形成的土壤硒含量有明显差异性,不同成因类型的富硒土壤生产出的农产品富硒程度也不同。依据广西百色市凌云县、田阳区、右江区和德保县的土地质量地球化学评价数据,以评价区不同成土母质类型为切入点,探讨不同成土母质类型下适合百色市发展富硒水稻产业的富硒土壤标准。结果表明:评价区土壤硒含量平均值为0.51 mg/kg,硒资源丰富。通过不同成土母质富硒率对比,发现当碎屑岩地区土壤硒含量达到0.24 mg/kg时,水稻籽实富硒率为72.7%,建议以此作为百色市碎屑岩地区的富硒土壤标准值,为当地土地区划利用、发展富硒水稻产业提供建议。

Soil-forming matrices are the basis of soil formation and the most important factor affecting the selenium content of soils.The selenium content of soils formed by different soil-forming matrices varies significantly,and different genetic types of selenium-rich soils produce different levels of selenium enrichment in agricultural products.Based on the geochemical evaluation data of land quality in Lingyun County,Tianyang District,Youjiang District and Debao County of Baise City,Guangxi,this paper takes the different soil-forming parent material types in the evaluation area as the entry point,and explores for selenium-rich soil standards suitable for the development of selenium-rich rice industry in Baise City under different soil-forming parent material types.The result shows that the average soil selenium content in the evaluation area is 0.51 mg/kg and the selenium resources are abundant.By comparing the selenium enrichment rates of different soil-forming parent materials,it is found that when the soil selenium content in the clastic rock area reaches 0.24 mg/kg,the selenium enrichment rate of rice seeds is 72.7%.It is recommended that this can be used as the standard threshold for selenium-rich soils in the clastic rock areas of Baise City.The scientific suggestion is provided for local land zoning use and the development of a selenium-rich rice industry.