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Journal of Soils and Sediments

, Volume 20, Issue 1, pp 404–411 | Cite as

Two-year fluctuation of Cd bioavailability in a remediated rice field under different water managements

  • Jianrui LiEmail author
  • Yingming Xu
Soils, Sec 4 • Ecotoxicology • Research Article
  • 18 Downloads

Abstract

Purpose

Based on two consecutive years of field-scale trials, under different water managements, we illustrated the persistence of remediation effect of palygorskite on a Cd-polluted rice field.

Materials and methods

The Cd uptake by a plant, pH and Cd chemical extractability, available P/K, and extractable Zn/Cu in paddy soils were used to evaluate the influence of palygorskite on Cd immobilization and soil fertility index.

Results and discussion

In contrast to the 1st year, at 0–1.5% palygorskite applied dose in soils, 0.025 M HCl–extractable Cd in continuous flooding reduced by 12.1–19.0%, and that in wetting irrigation increased by 10.9–18.9% in the 2nd year (p < 0.05). The toxicity characteristic leaching procedure Cd reduction of 3.0–11.4% and increase of 8.9–12.0% were obtained under above-mentioned water managements (p < 0.05). Compared with the 1st year, at different clay additional concentrations, grain Cd in continuous flooding reduced by 7.0–11.3%, and that in wetting irrigation increased by 6.5–10.8% in the 2nd year (p < 0.05). Although trace elements in clay treated soils declined, they had no influence on the grain yield due to a minimum value higher than the critical value of 1.5 mg kg−1 for Zn and 2.0 mg kg−1 for Cu. The available P in continuous flooding took on a maximum increase of 8.2% in the 2nd year (p < 0.05).

Conclusions

Two consecutive years of field-scale in situ demonstration tests revealed that continuous flooding was a preferable water management regime for Cd immobilization using palygorskite in the rice field. There were no remarkable differences in extractable Zn/Cu between 2 years.

Keywords

Cd Immobilization remediation Palygorskite Water management 

Notes

Funding information

This work was financially supported by the National Natural Science Foundation of China (No. 21177068).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Taiyuan Institute of TechnologyTaiyuanChina
  2. 2.Agro-Environmental Protection InstituteMinistry of AgricultureTianjinChina

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