数字农科院2.0

Two-Year Fluctuation Of Cd Bioavailability In A Remediated Rice Field Under Different Water Managements

文献类型： 外文期刊

作者： Li, JR; Xu, YM

作者机构：

关键词： Cd; Immobilization Remediation; Palygorskite; Water Management

期刊名称： JOURNAL OF SOILS AND SEDIMENTS

ISSN： 1439-0108

年卷期： 2020 年 20 卷 1 期

页码：

收录情况： JCR（2021版）

摘要： 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.

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