Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (20): 71-76.doi: 10.11924/j.issn.1000-6850.casb2021-0288

Special Issue: 资源与环境

Previous Articles     Next Articles

Effects of Heat Modified Kaoline on Soil Cadmium Form and Cadmium Uptake by Pepper

Yang Jiaojiao1(), Chai Guanqun2(), Liu Guihua2, Wang Ying2, Qin Song2, Fan Chengwu2   

  1. 1College of Agriculture, Guizhou University, Guiyang 550025
    2Institute of Soil Fertilizer, Guizhou Academy ofAgricultural Sciences, Guiyang 550006
    3Agriculture and Rural Bureau of Bozhou District, Zunyi Guizhou 563100
  • Received:2021-03-19 Revised:2021-05-27 Online:2021-07-15 Published:2021-08-06
  • Contact: Chai Guanqun E-mail:1422929102@qq.com;chaiguanqun@163.com

Abstract:

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 by 1.82%-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.

Key words: thermal modification, Cd form, kaoline, accumulation, pepper

CLC Number: