蔬菜种植前施用石灰对土壤中有效态重金属含量的影响

采用盆栽的方式研究了蔬菜种植前施用石灰对南方强酸性土壤中有效态重金属含量的影响.结果表明:随着石灰施用量的增加及处理时间的延长,有效态铅、镉含量逐渐降低;有效态铜、铬、汞含量则逐渐增加;有效态锌、砷含量则表现为石灰用量低时比未加石灰处理低,石灰用量高时则比未加石灰处理高;此外,土壤中的有效态重金属含量在不同处理时间、不同石灰用量条件下存在一定差异.

Effect of limestone application on the content of available heavy meatal in soil before planting vegetables

Culture pot experiment was used to study the effects of limestone on the content of soil available heavy meatal before planting vegetables in acid soil . The results showed that with the increase of limestone used and as times went on, the content of available Pb,Cd became less and less the content of available Cu,Cr, Hg became more and more, the content of available Zn, and As decreased when the limestone dosage was low and increased when the limestone dosage was high. The changes of the content of available heavy meatal were different in different time and different dosage of limestone.