石灰对土壤吸附镉行为及有效性的影响  

Cadium Adsorption and Availability as Affected by Soil Liming

作　　者：熊礼明[1] 

机构地区：[1]中国科学院南京土壤研究所

出　　处：《环境科学研究》1994年第1期35-38,共4页Research of Environmental Sciences

摘　　要：酸性红壤上添加石灰显著增加土壤对镉的吸附量并降低吸附态镉的解吸量。但石灰用量较低时，镉的解吸率反而比未施石灰时增加。盆栽试验亦表明，在石灰用量较低时，土壤ｐＨ虽有所升高，但小麦和黑麦草植株镉含量降低不明显甚至有所升高；只有较高的石灰用量使土壤ｐＨ得以明显升高，植株吸镉量才能明显降低。对这一现象的原因进行了讨论。Liming an acidic red earth increased significantly the cadmium adsorptiion in soil anddecreased its desorption. However compared with unlimed control treatment,the desorption of Cdincreased at lower liming level. Pot culture with winter wheat and ryegrass also indicated thatplant accumulation of Cd did not significantly decrease or even increased somewhat at lower limedose;whereas an obvious decrease in Cd uptake by plants was noted at higher liming level.It issuggested that higher amount of lime should be applied to increase the soil pH significantly in order to control plant accumulation of cadmium. The role of calcium in regulating the liming effectwas discussed in light of its influence on Cd adsorption and desorption in soil.

关 键 词：镉 石灰 吸附 土壤 植物 吸收 

分 类 号：X530.5[环境科学与工程—环境工程]