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

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

[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%。

[Objective]The objective 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 p H,while overdose of attapulgite（ ≥2. 0%（ m/m）） could lead to the decline of soil available nutrients. Application of attapulgite showed significant effect on remediation of Cd contaminated soil,which could reduce the content of available Cd in soil and the absorption of Cd in Chinese cabbage. [Conclusion]Recommended adding proportion of attapulgite was 1. 0 %（ m/m） in this article.