淹水条件下有机物料对潮土外源镉形态及化学性质的影响

在室内淹水培养条件下,运用连续提取法研究稻草、紫云英和猪粪对潮土中外源镉的形态及土壤化学性质的影响。结果表明,有机物料显著增加了土壤有机碳,pH,活性氧化物的含量。有机碳的增加显著地增加紧有机结合态镉含量,而显著地降低了交换态镉的含量。并随着时间的增长,影响更显著。交换态镉的含量与Eh值呈显著的正相关,而紧有机结合态镉与Eh值呈显著的负相关。

Effects of organic materials on forms and chemical properties of added exogenous cadmium in submerged fluvo-aquic soil

Effect of three organic materials (rice straw, Chinese milk vetch and pig manure) on the forms of cadmium (Cd) added and soil properties in fluvo aquic soil was studied using submerged incubation and sequential extraction. The results showed that the added organic materials increased remarkably soil solid carbon, pH value, the concentration of oxides. Accumulated SOC caused the remarkable increase of Cd bound to organic matter and the remarkable decrease of exchangeable Cd. The concentration of exchangeable Cd correlated positively with Eh, and the concentration of tightly bound organic Cd correlated negatively with Eh.