珠江三角洲台山地区富硒土壤资源评价

Resource evaluation of selenium-rich soils in Taishan region of the Pearl River Delta

系统采集珠江三角洲台山地区表层土壤和农作物样品,测定了Se、Cd、Hg等20项指标含量,研究该地区土壤富硒特征。结果表明,台山地区土壤Se含量丰富,均值达0.56mg/kg,建立了适合当地的富硒土壤分级标准:<0.2mg/kg为低硒区,0.2~0.6mg/kg为硒正常含量范围,0.6~3.0mg/kg为富硒区,>3.0mg/kg则为硒过剩。在此基础上,选取土壤Se含量、土壤环境健康元素和土壤养分作为评价指标,辅以农作物的生物效应检验,开展台山地区富硒土壤资源评价区划,共圈定富硒土壤资源区7处,面积165.2km2,可作为该区今后硒土壤资源开发利用的依据。

By systematically sampling surface soil and its crops,the paper determined 20 elements content including Se, Cd, Hg, to analyze the characteristics of selenium in the study area. The result shows that the Taishan region is rich in selenium, whose average value is 0.56 mg/kg. The study established selenium-rich soils grading scales： 0.2 mg/kg is the boundary value of low selenium; 0.2-0.6 mg/kg is normal selenium content; 0.6-3.0 mg/kg is rich selenium; over 3.0 mg/kg is excessive selenium. Besides, considering the evaluating factors such as selenium content in soil, soil environment, soil nutrition and agricultural product bioeffect test, this study carried out resource evaluation and regionalization of the selenium-rich soils of Taishan area, and delineated 7 areas of selenium-rich soils, covering a area of 165.2 km^2. The results will be of good reference for selenium soil exploitation.