摘要
为了解常用调理剂对中性土壤中Cd的钝化效果,从浙江省污染农田中选取了4种含Cd量不同的中性土壤(pH 6.5～7.5),采用室内培养与盆栽种植水稻的方法研究了4类调理剂对土壤Cd形态组成、有效态Cd含量和水稻中Cd积累的影响。结果表明:4类调理剂对土壤生物有效性较高的水溶性Cd和交换态Cd含量的影响最为显著,其影响程度随土壤全Cd含量的增加而增加,且在砂壤土中的影响高于在粘壤土中的;石灰石粉、钙镁磷肥和生物质炭的施用效果高于蒙脱石的;4类调理剂对土壤有效Cd含量和糙米中Cd积累的影响与对土壤中水溶性Cd含量的影响基本相似。
In order to understand the inactivation effect of common amendments on Cd in neutral soils, four kinds of neutral soils(pH 6.5～7.5) with different Cd contents were collected from polluted farmlands in Zhejiang Province. The effects of four kinds of amendments on soil Cd chemical forms, soil bio-available Cd content, and Cd accumulation in brown rice were studied by means of indoor pot cultivation of rice. The results showed that the amendments had the most significant effects on both water-soluble Cd and exchangeable Cd with higher soil bioavailability, and their effects increased with the increase in soil total Cd content, which were higher in sandy loam than those in clay loam. The effects of limestone, calcium magnesium phosphate, and biochar were higher than those of montmorillonite. The effects of four types of amendments on soil available Cd content, and Cd accumulation in brown rice were similar to those on water-soluble Cd.
引文
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