添加改良剂对土壤中硒的生物有效性的影响

Effects of adding amendments on the bioavailability of selenium in soil

国内外大量学者研究了土壤改良剂对重金属的修复效果,获得了许多重要的成果。硒作为分散元素,在全世界范围内都属稀有资源。安康地区作为我国天然富硒区,硒资源丰富,富硒土壤面积巨大,然而土壤偏酸性,土壤中有效硒含量不高。这一方面,国内研究报道较少。文章基于安康西部紫阳、汉阴两县开展的土地质量调查工作,在富硒区紫阳选取酸性富硒土壤,通过添加粉煤灰、生物炭、磷矿粉,改变土壤酸碱度,研究其对土壤中硒的生物有效性的影响。结果表明这3种添加剂均可不同程度提高土壤中硒的生物有效性。

A large number of scholars at home and abroad have studied the remediation effect of soil amendments on heavy metals and have obtained many important achievements.As a dispersing element,selenium is a rare resource all over the world.As a natural area rich in selenium in China,Ankang area is abundant in selenium resources and covers a large area of soil rich in selenium.However,the soil is acidic and the effective selenium content in the soil is not high.In this regard,domestic research reports are rarely seen.Based on the land quality survey work carried out in Ziyang and Hanyin counties located in western Ankang,this paper selects acidic soil rich in selenium in Ziyang,a selenium-rich area,and changes the pH of the soil by adding fly ash,biochar and phosphate rock powder to study their effect on the bioavailability of selenium in the soil.The results show that these three additives can improve the bioavailability of selenium in the soil to different extent.