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Chemical behavior of Cd in rice rhizosphere.
Chemosphere. 2003 Feb; 50(6):755-61.C

Abstract

Chemical behavior of Cd in rice rhizosphere as affected or not by Pb was investigated. The NH4OAc extractable Cd in the rhizosphere was distinctly lower than that in bulk soil. The depletion of Cd in the rhizosphere could not be simply attributed to Cd uptake by rice. The observed phenomena could be attributed to the decreasing pH in the rhizosphere and the complexing capabilities of soluble exudates for Cd. Extractable Cd increased in both the rhizosphere and bulk soil after the addition of Pb, which might be caused by the replacement of Pb for Cd. The extractable Cd in the non-rhizosphere varied with the distance from the root surface, especially within 0-1 mm, which was greatly affected by the combined effects of mass flow, activation and fixation, and had the lowest extractable Cd. Pb addition affected the distribution of extractable Cd in the non-rhizosphere, implying that the affinity of Pb for organic matter was greater than that of Cd. The difference of Cd species between rhizosphere and bulk soil demonstrated that the transformation of exchangeable Cd (EXC-Cd) to OM-Cd (bound to organic matter) and FMO-Cd (bound to iron and manganese oxide) occurred in the rice rhizosphere due to the exudations from the rice root, the activity of microorganisms on the root surface and the activation of Fe and Mn oxides. The interaction between Pb and Cd resulted in the content of EXC-Cd being higher in the presence of Pb, whereas the OM-Cd content was lower in the presence of Pb.

Authors+Show Affiliations

Lin Q
Department of Environmental Science, Zhejiang University, Huajiachi, Hangzhou 310029, China. linqi@zju.edu.cn
Chen YX
No affiliation info available
Chen HM
No affiliation info available
Yu YL
No affiliation info available
Luo YM
No affiliation info available
Wong MH
No affiliation info available

MeSH

CadmiumCadmium CompoundsHydrogen-Ion ConcentrationIron CompoundsLeadManganese CompoundsOryzaPlant RootsSoil

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

12688487

Citation

Lin, Q, et al. "Chemical Behavior of Cd in Rice Rhizosphere." Chemosphere, vol. 50, no. 6, 2003, pp. 755-61.
Lin Q, Chen YX, Chen HM, et al. Chemical behavior of Cd in rice rhizosphere. Chemosphere. 2003;50(6):755-61.
Lin, Q., Chen, Y. X., Chen, H. M., Yu, Y. L., Luo, Y. M., & Wong, M. H. (2003). Chemical behavior of Cd in rice rhizosphere. Chemosphere, 50(6), 755-61.
Lin Q, et al. Chemical Behavior of Cd in Rice Rhizosphere. Chemosphere. 2003;50(6):755-61. PubMed PMID: 12688487.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Chemical behavior of Cd in rice rhizosphere. AU - Lin,Q, AU - Chen,Y X, AU - Chen,H M, AU - Yu,Y L, AU - Luo,Y M, AU - Wong,M H, PY - 2003/4/12/pubmed PY - 2003/5/21/medline PY - 2003/4/12/entrez SP - 755 EP - 61 JF - Chemosphere JO - Chemosphere VL - 50 IS - 6 N2 - Chemical behavior of Cd in rice rhizosphere as affected or not by Pb was investigated. The NH4OAc extractable Cd in the rhizosphere was distinctly lower than that in bulk soil. The depletion of Cd in the rhizosphere could not be simply attributed to Cd uptake by rice. The observed phenomena could be attributed to the decreasing pH in the rhizosphere and the complexing capabilities of soluble exudates for Cd. Extractable Cd increased in both the rhizosphere and bulk soil after the addition of Pb, which might be caused by the replacement of Pb for Cd. The extractable Cd in the non-rhizosphere varied with the distance from the root surface, especially within 0-1 mm, which was greatly affected by the combined effects of mass flow, activation and fixation, and had the lowest extractable Cd. Pb addition affected the distribution of extractable Cd in the non-rhizosphere, implying that the affinity of Pb for organic matter was greater than that of Cd. The difference of Cd species between rhizosphere and bulk soil demonstrated that the transformation of exchangeable Cd (EXC-Cd) to OM-Cd (bound to organic matter) and FMO-Cd (bound to iron and manganese oxide) occurred in the rice rhizosphere due to the exudations from the rice root, the activity of microorganisms on the root surface and the activation of Fe and Mn oxides. The interaction between Pb and Cd resulted in the content of EXC-Cd being higher in the presence of Pb, whereas the OM-Cd content was lower in the presence of Pb. SN - 0045-6535 UR - https://www.unboundmedicine.com/medline/citation/12688487/Chemical_behavior_of_Cd_in_rice_rhizosphere_ DB - PRIME DP - Unbound Medicine ER -