不同土壤钝化剂对土壤镉生物有效性的影响  

Effects of Different Passivators on Bio-availability of Cd in Soil

作　　者：李婧[1] 陈森[1] 周艳文[1] 高小杰[1] 

机构地区：[1]南京市环境保护科学研究院,江苏南京210013

出　　处：《安徽农业科学》2017年第36期94-97,共4页Journal of Anhui Agricultural Sciences

基　　金：南京市环境保护局2013年度环保课题计划(201306)

摘　　要：[目的]寻找有效控制Cd污染土壤上小白菜对重金属Cd吸收的技术方法。[方法]2015年进行小白菜盆栽试验,选取生物质炭、凹凸棒石、石灰石作为土壤Cd钝化剂。于小白菜收获时,取样分析小白菜产量、株高,以及小白菜和土壤中Cd含量。[结果]施用3种钝化剂均增加土壤速效钾含量,提高土壤pH,促进小白菜生长;施用3种钝化剂可显著增加土壤对Cd的吸持固定,降低土壤生物有效性Cd含量,显著降低小白菜地上部Cd含量和小白菜对Cd的富集系数;3种钝化剂对Cd污染土壤的治理效果表现为:石灰石>凹凸棒石>生物质炭。[结论]该研究可为污染土壤上农作物的安全生产提供参考。[ Objective]To find an effective technical method to control the absorbtion of Cd in soil by Chinese cabbage. [Method] A pot experi-ment was carried out,in which biochar,attapulgite and limestone was used as passivators of Cd in soil. The output,plant height of Chinese cab-bage, and Cd content in plant and soil were analyzed. [Result] All of the three passivators increased the available potassium content, the cadmium content and pH in soil,and promoted the growth of Chinese cabbage; while reduced the bio-available C d content in soil,the C d content in over-ground part of Chinese cabbage and the enrichment factor of Cd by Chinese cabbage. The governance effects of three passivators in this experiment showed limestone 〉 attapulgite 〉 biochar. [ Conclusion] The research can provide reference for crop producing safely in polluted soil.

关 键 词：CD污染 生物有效性Cd 钝化剂 小白菜 

分 类 号：S157.9[农业科学—土壤学] X53[农业科学—农业基础科学]