• 关键词：土壤  汞形态  活性抑制  陆生食物链

• 基金项目：国家教委基金

• 青长乐
• 西南农业大学,重庆 630716

• 牟树森
• 西南农业大学,重庆 630716

• 摘要：土壤对Hg²⁺有自净力,其作用实质是Hg的形态转化。本研究试验了膨润土、腐殖质、碳酸钙对汞形态转化的影响。结果表明,膨润土是使Hg²⁺迅速向残留态转化而降低作物对汞的吸收,其效果在用量为0-450g/kg范围呈线性增长；腐殖质使Hg²⁺迅速向腐殖质态汞转化,且有与矿质粘粒争夺Hg²⁺之势,故最适用量因土壤粘粒含量而异；碳酸钙也使Hg²⁺向残留态转化,对酸性土的最佳用量,以使土壤的钙饱和度达到50%-85%为好。

• Abstract：The influences of bentonite,humus and CaCO₃ on transformation of mercury in soilwere investigated. The results showed that bentonite, humus, and CaCO₃ are able to stimu-late the transformation of Hg from ion to other bonding forms and consequently depress ad-sorption of Hg by plant. Bentonite depressed the Hg adsorption linearly correlated with itscontent within a range of 0-450 g/kg.Humus competed with soil clay for Hg²⁺ and the re-lation of content-response correlated with clay content of the sample. CaCO₃ was effective todepress plant Hg uptake from soil under certain conditions.The mechanism of CaCO₃ issomewhat similar to that of bentonite.

• Key words：soil  Hg activity depress  terrestrial food chain

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