摘要
为了探明热改性高岭土对土壤-辣椒体系中Cd迁移的影响,研究2个温度(300、500℃)对高岭土进行热改性,采用盆栽的方式探究高岭土及热改性高岭土对于Cd污染土壤中Cd的形态分布以及对辣椒体内重金属积累的影响。结果表明:在Cd污染土壤上,施用高岭土及热改性高岭土提高土壤pH,但处理间差异不显著;与CK相比,添加300℃热改性高岭土(TK)与500℃热改性高岭土(FK)土壤可还原态Cd含量分别降低1.82%~33.94%、11.76%~26.67%,残渣态Cd含量分别提高46.63%~64.58%、45.96%~1.14%;各处理辣椒的根、茎、叶、果实的干重均高于CK,辣椒果实干重增产31.00%~49.28%,辣椒植株Cd富集依次为根部>叶片>茎>果实。得出结论:施用高岭土及热改性高岭土可提高土壤pH,降低土壤弱酸提取态、还原态Cd含量,减轻Cd对辣椒的协迫,3种材料修复效果为TK>FK>K。
To investigate the effect of heat modified kaoline on Cd migration in soil-pepper system,heat modified kaoline at 2 temperatures(300 and 500℃)was studied,the effects of kaoline and heat modified kaoline on the morphological distribution of Cd in Cd contaminated soil and the accumulation of heavy metals in pepper were investigated by pot culture.The results showed that in Cd contaminated soil,the application of kaoline and heat modified kaoline improved soil pH,but the difference between the treatments was not significant;compared with that of CK,the reducible Cd content in 300℃and 500℃treatment was reduced by1.82%-33.94%and 11.76%-26.67%,respectively,the residue Cd content was increased by 46.63%~64.58%and 45.96%-1.14%,respectively;dry weight of the roots,stems,leaves and fruits of pepper in each treatment were higher than those of CK,capsicum fruit dry weight was increased by 31.00%-49.28%,the enrichment of Cd in pepper plants was roots>leaves>stems>fruits.In conclusion,the application of kaoline and heat modified kaoline could improve soil pH,decrease the content of soil weak acid extraction state and reducible Cd,ease Cd pressure on chili pepper,and the remediation effect is TK>FK>K.
作者
杨娇娇
柴冠群
刘桂华
王莹
秦松
范成五
无
Yang Jiaojiao;Chai Guanqun;Liu Guihua;Wang Ying;Qin Song;Fan Chengwu;无(College of Agriculture,Guizhou University,Guiyang 550025;Institute of Soil Fertilizer,Guizhou Academy of Agricultural Sciences,Guiyang 550006;Agriculture and Rural Bureau of Bozhou District,Zunvi Guizhou 563100)
出处
《中国农学通报》
2021年第20期71-76,共6页
Chinese Agricultural Science Bulletin
基金
黔科合支撑“合肥辣椒产地重金属调查及安全生产关键技术研究与示范”([2018]2338)。
关键词
热改性
CD形态
高岭土
累积
辣椒
thermal modification
Cd form
kaoline
accumulation
pepper
