凹凸棒石施用对镉污染土壤理化性质及小白菜生长的影响

[目的]明确凹凸棒石对重金属污染土壤中镉的治理效果。[方法]以小白菜为试验材料,开展小白菜盆栽试验,分析施用凹凸棒石后小白菜的长势、土壤养分和土壤重金属镉含量。[结果]适量添加凹凸棒石可有效增加小白菜的产量,提高酸性土壤的p H,但过量[≥2.0%(m/m)]添加会导致土壤速效养分降低;施用凹凸棒石对镉污染土壤的修复具有显著效果,可有效降低土壤有效镉含量和小白菜对镉的吸收。[结论]试验推荐凹凸棒石添加比例为1.0%。

Effects of Attapulgite Application on Cd Contaminated Soil' s Physical and Chemical Properties and Chinese Cabbage' s Growth

[Objective]TheObjective was to pinpoint the harness effect of Cd in soil by attapulgite .[Method]Using Chinese cabbage as test material, pot experiment was carried out.Growth vigor of Chinese cabbage and nutrient and heavy metal Cd content in soil were analyzed. [Result] Moderate addition of attapulgite could enhance the output of Chinese cabbage effectively, as well as soil pH ,while overdose of at-tapulgite (≥2.0%(m/m))could lead to the decline of soil available nutrients.Application of attapulgite showed significant effect on remedi-ation of Cd contaminated soil, which could reduce the content of available Cd in soil and the absorption of Cd in Chinese cabbage .[ Conclu-sion]Recommended adding proportion of attapulgite was 1.0 %( m/m) in this article.