欢迎访问《中国农学通报》,

中国农学通报 ›› 2017, Vol. 33 ›› Issue (30): 97-102.doi: 10.11924/j.issn.1000-6850.casb16120051

所属专题: 水稻

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

酸碱度调节剂对稻田土壤中有效态镉的影响研究

曹胜   

  1. 湖南农业大学资源环境学院
  • 收稿日期:2016-12-11 修回日期:2017-02-14 接受日期:2017-02-22 出版日期:2017-10-31 发布日期:2017-10-31
  • 通讯作者: 曹胜
  • 基金资助:
    湖南省农业厅项目“湖南重金属污染耕地修复及农作物种植结构调整试点项目”(NC201538MZ01)。

Effect of pH Adjustor on Available Cadmium in Paddy Soils

曹胜   

  • Received:2016-12-11 Revised:2017-02-14 Accepted:2017-02-22 Online:2017-10-31 Published:2017-10-31

摘要: 为弄清不同酸碱度调节剂对稻田土壤中有效态Cd的动态影响差异,采用室内培养试验,通过对1、5、10、20 mg/kg 外源Cd浓度污染麻砂泥土壤添加4 种酸碱度调节剂处理,探讨在第15 天和45 天其对Cd的有效性影响。结果表明:与不施加酸碱度调节剂的对照对比,添加SH1.5、SH3、GG1.5 和GG3 调节剂可在一定程度增加土壤pH,从而降低土壤中Cd 的有效态含量。4 种外源Cd 浓度污染土壤中,用TCLP和CaCl2提取的有效态镉含量与土壤pH均成负相关关系。培养过程中,TCLP提取态和CaCl2交换态Cd 含量分别下降17.41%~48.02%、30.95%~87.89%,同时SH3 修复效果表现突出。研究结果可为Cd超标稻田的安全生产及阻控提供科学指导。

关键词: 纳他霉素, 纳他霉素, 纳塔尔链霉菌, 发酵, 单因素, 条件优化

Abstract: To clarify the dynamic effects of different pH adjustors on available Cd in paddy soil, four kinds of pH adjustor were added to Mashani soils with 1, 5, 10 and 20 mg/kg exogenous Cd, and the adjustors’effect on Cd effectiveness on the 15th and 45th day was studied by indoor culture experiment. The results showed that compared with CK the addition of SH1.5, SH3, GG1.5 and GG3 adjustors could increase soil pH value to a certain extent, thus to reduce the available content of Cd in soil. The contents of available cadmium in Cd contaminated soil with the four concentrations extracted by TCLP and CaCl2 were negatively correlated with soil pH value. The Cd contents of TCLP extract state and CaCl2 exchange state decreased by 17.41%~48.02% and 30.95%~87.89%, and the remediation effect of SH3 was outstanding. The results could provide scientific guidance for safe production and resistance control in Cd over-standard paddy field.