Root-induced changes to cadmium speciation in the rhizosphere of two rice (Oryza sativa L.) genotypes

被引:55
作者
Hu, Linfei [1 ,2 ,3 ]
McBride, Murray B. [3 ]
Cheng, Hao [1 ,2 ]
Wu, Jianjun [1 ,2 ,4 ]
Shi, Jiachun [1 ,2 ,4 ]
Xu, Jianming [1 ,2 ,4 ]
Wu, Laosheng [1 ,2 ,4 ]
机构
[1] Zhejiang Univ, Inst Soil & Water Resources & Environm Sci, Hangzhou 310029, Zhejiang, Peoples R China
[2] Zhejiang Univ, Zhejiang Prov Key Lab Subtrop Soil & Plant Nutr, Hangzhou 310029, Zhejiang, Peoples R China
[3] Cornell Univ, Dept Crop & Soil Sci, Ithaca, NY 14853 USA
[4] Minist Agr Key Lab Nonpoint Source Pollut Control, Hangzhou 310029, Zhejiang, Peoples R China
关键词
Rice; Cadmium speciation; Exchangeable Cd; Rhizosphere; Root exudates; SEQUENTIAL EXTRACTION PROCEDURE; HEAVY-METALS; ACCUMULATION; SOILS; TRACE; BIOAVAILABILITY; FRACTIONATION; VARIETIES; CULTIVARS; ELEMENTS;
D O I
10.1016/j.envres.2011.01.012
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Our aim was to investigate rhizosphere effects on the chemical behavior of Cd. This was done in a glasshouse experiment, where two rice cultivars (Zhenong54 and Sixizhan) were grown in soil spiked with cadmium (Cd) at two levels, 3.9 +/- 0.5 and 8.3 +/- 0.5 mg kg(-1) soil, placed in a rhizobox until ripening stage. Chemical forms of cadmium near the root surface were then assessed using a sequential extraction procedure (SEP). There were significant differences in Cd species, especially exchangeable Cd (EXC-Cd) between the two rice cultivars as affected by rice roots. The lowest EXC-Cd with Zhenong54 appeared in the near-rhizosphere area with little difference between tillering stage and ripening stage while Sixizhan had its lowest EXC-Cd concentration in the root compartment. Both cultivars had slight changes in the Fe/Mn oxide-bound fraction of Cd (FMO-Cd) at the grain ripening stage while the control treatments without plants had a significant increase in FMO-Cd at the same time, indicating a transformation from a less bioavailable form (FMO-Cd) to more bioavailable forms (EXC-Cd). Soil microbial biomass in the vicinity of the root surface had opposite trends to some extent with EXC-Cd, partly because of the root-induced changes to bioavailable Cd. Unlike Zhenong54, Sixizhan had a higher Cd concentration in the root, but only a small proportion of Cd translocated from the root to grain. (C) 2011 Elsevier Inc. All rights reserved.
引用
收藏
页码:356 / 361
页数:6
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