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[PLANT AND SOIL],卷: 440 期: 1-2 页: 539-549
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作者:Wu, GM (Wu, Guangmei) ; Hu, PJ (Hu, Pengjie) ; Zhou, JW (Zhou, Jiawen) ; Dong, B (Dong, Bei) ; Wu, LH (Wu, Longhua) ; Luo, YM (Luo, Yongming) ; Christie, P (Christie, Peter) 

 

题目:Sulfur application combined with water management enhances phytoextraction rate and decreases rice cadmium uptake in a Sedum plumbizincicola - Oryza sativa rotation

 

刊物:PLANT AND SOIL,卷: 440  期: 1-2  页: 539-549

DOI: 10.1007/s11104-019-04095-w

出版年: JUL 2019

 

摘要:

Background and aims Soil cadmium (Cd) contamination threatens food safety and human health. Increasing Cd phytoextraction efficiency by hyperaccumulators and growing safe products during remediation remain challenges.

 

Methods A pot experiment was conducted to explore the effects of different rates of sulfur (S) associated with alternating drying and wetting on a Sedum plumbizincicola-Oryza sativa rotation in Cd-contaminated neutral and calcareous soils.

 

Results The oxidation of added S under aerobic conditions significantly decreased soil solution pH and increased soluble sulfate (SO42-), Cd and iron (Fe) concentrations in both soils. During the rice growing season the soil solution redox (Eh) decreased to < -200 mV and the solution pH increased to neutral during the first few days of flooding. Soluble SO42- and Cd in the S treatments decreased significantly with increasing duration of flooding. Sulfur addition promoted shoot Cd concentrations of S. plumbizincicola by 1.7-5.5 times on calcareous soil and 1.7-2.3 times on neutral soil compared to the controls. Rice yields increased but Cd concentrations decreased at suitable S addition rates.

 

Conclusions Appropriate sulfur amendment combined with water management can be a feasible strategy to enhance the Cd remediation efficiency of the hyperaccumulator and reduce the accumulation of Cd in the rice grains in this rotation.

 

 

 

 

 

 

 

 


 

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