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The role of pores in micro-zone distribution of Cd in a tropical paddy soil: Results from X-ray computed tomography combined energy dispersive spectroscopy analysis

文献类型： 外文期刊

作者： Wei, Chaoxian 1 ; Lin, Bigui 1 ; Liu, Beibei 1 ; He, Zhenli 6 ; Li, Qinfen 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Haikou 571101, Peoples R China

2.Minist Agr & Rural Affairs, Key Lab Low Carbon Green Agr Trop reg China, Haikou 571101, Peoples R China

3.Natl Long Term Expt Stn Agr Green Dev, Danzhou 571737, Hainan, Peoples R China

4.Natl Agr Expt Stn Agr Environm, Danzhou 571737, Hainan, Peoples R China

5.Hainan Key Lab Trop Ecocircular Agr, Haikou 571101, Hainan, Peoples R China

6.Univ Florida, Inst Food & Agr Sci, Indian River Res & Educ Ctr, Dept Soil & Water Sci, Ft Pierce, FL USA

关键词： Cadmium; Undisturbed tropical soil; Micro -zone distribution; Air space pores; Water -holding pores

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：13.6； 五年影响因子：12.7 ）

ISSN： 0304-3894

年卷期： 2023 年 457 卷

页码：

收录情况： SCI

摘要： Accurate description of Cd micro-zone distribution and accumulation is the prerequisite for revealing Cd transfer and transformation processes. However, to date, the role of soil pores in the Cd micro-zone distribution char-acteristics in undisturbed soil is still unclear. In this study, the obvious heterogeneous distribution of Cd in and around the soil pores at the cross-sectional surface of the tropical undisturbed topsoil was visualized by the combination of X-ray micro-computed tomography and scanning electron microscope-energy dispersive spec-troscopy. For both the air space and water-holding pores, the micro-zone distribution characteristics of Cd around the pores were dominated by pore sizes. For macropores and mesopores, Cd preferred to distribute in the micro-zone within 167.5-335 & mu;m from pores. But for micropores, the highest content percentage of Cd was exhibited in the micro-zone within 67-167.5 & mu;m from pores. The random forest model revealed that the occurrence of Fe (13.83%) and P (13.59%) contributed most to Cd micro-zone distribution around air space pores. While for water-holding pores, Fe occurrence (18.30%) contributed more significantly than P (11.92%) to Cd micro-zone distribution. Our study provided new insights into Cd retention mechanism, which is help for accessing Cd migration and transformation.

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