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中国农学通报 ›› 2020, Vol. 36 ›› Issue (32): 88-94.doi: 10.11924/j.issn.1000-6850.casb20191000755

• 资源·环境·生态·土壤·气象 • 上一篇    下一篇

有机质对土壤中氯吡脲吸附-解吸行为的影响

裴广鹏1,2(), 朱宇恩1, 李华1()   

  1. 1山西大学环境与资源学院,太原 030006
    2山西大学资源与环境工程研究所,太原 030006
  • 收稿日期:2019-10-24 修回日期:2020-04-22 出版日期:2020-11-15 发布日期:2020-11-19
  • 通讯作者: 李华
  • 作者简介:裴广鹏,男,1989年出生,山西浑源人,在读博士,研究方向:环境污染修复与治理。通信地址:030006 山西省太原市小店区坞城路92号 山西大学环境与资源学院,Tel:0351-7018784,E-mail: peiguangpeng@163.com
  • 基金资助:
    山西省重点研发计划重点项目“基于生态庄园经济模式的有机农业产业技术体系研究与示范”(201703D211014);山西省研究生教育创新项目“还原性醋糟基制剂防控番茄土传枯萎病的作用效果及其机理研究”(2018BY011);黄土高原生态恢复山西省重点实验室;国家科技惠民计划项目“资源枯竭型矿区塌陷地生态产业技术与示范”(2013GS140202)

Effect of Soil Organic Matter on Adsorption and Desorption of Forchlorfenuron in Soil

Pei Guangpeng1,2(), Zhu Yuen1, Li Hua1()   

  1. 1School of Environment Science and Resources, Shanxi University, Taiyuan 030006
    2Institute of Resources and Environment Engineering, Shanxi University, Taiyuan 030006
  • Received:2019-10-24 Revised:2020-04-22 Online:2020-11-15 Published:2020-11-19
  • Contact: Li Hua

摘要:

为了明确氯吡脲在土壤中的迁移转化行为及有机质对该过程的影响,采用振荡平衡法研究氯吡脲在有机质含量不同的2种土壤中的吸附-解吸行为。结果表明:拟二级动力学能够最好地拟合吸附动力学过程,且R2为0.9999。在2种土壤中氯吡脲的吸附解吸等温线均呈非线性,Freundlich方程可以对吸附解吸数据有着较好的拟合,且高有机质土壤的吸附容量远大于低有机质土壤,但解吸过程中存在迟滞现象。通过比较表明,有机质存在时以有机质吸附为主,无机矿物吸附很弱,且有机质能够显著增加氯吡脲的吸附容量。同时,高有机质土壤解吸过程存在显著的迟滞行为,平均为0.6273,而在低有机质土壤中迟滞系数存在负值,表明有机质能够加强对氯吡脲的固定,降低其继续迁移转化的风险。

关键词: 氯吡脲, 吸附, 解吸, 有机质, 土壤, 迁移转化

Abstract:

To explore the migration and transformation of forchlorfenuron in soil and the effect of organic matter on the process, the batch equilibrium experiments were used to investigate the adsorption and desorption of forchlorfenuron in two soils with different organic matter contents. The results showed that the adsorption kinetics could be well described by the pseudo-second order kinetics model, and the R2reached 0.9999. All adsorption and desorption isotherms were of deviation from the linear model, and all experimental data could be best described by the Freundlich model. Meanwhile, adsorption capacity in soil with high organic matter content was higher than that in soil with low organic matter content, but there was hysteresis in the desorption process. All the results showed that the adsorption of forchlorfenuron by organic matter was mainly in the presence of organic matter, while the adsorption of inorganic minerals was very weak. And organic matter could significantly increase the adsorption capacity of forchlorfenuron. However, the desorption process of forchlorfenuron in soil with high organic matter content had significant hysteresis behavior with hysteresis index of 0.6273, while the hysteresis index in soil with low organic matter had a negative value, which indicated that organic matter can enhance the immobilization of forchlorfenuron and reduce the risk of its migration and transformation.

Key words: forchlorfenuron, adsorption, desorption, organic matter, soil, migration and transformation

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