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Remediation of Cd-contaminated acidic paddy fields with four-year consecutive liming.
Ecotoxicol Environ Saf. 2020 Jan 30; 188:109903.EE

Abstract

Liming has been widely used to remediate Cd-contaminated acidic soils, but the effects of consecutive liming are still unclear. Four-year liming experiments were conducted to assess the remediation of Cd-contaminated acidic paddy fields in a double rice cropping system. With four-year consecutive liming (quicklime, 2.25 t ha-1 per season), the soil pH was increased by an average of 0.57 units (0.10-1.16 units), while the soil DTPA-Cd and available Fe and Mn were reduced by 9%, 19% and 31% (p < 0.05), respectively. The exchangeable plus water-soluble Cd fraction in soil was reduced by 17%, while the soil carbonate-, Fe/Mn oxide- and organic-bound Cd fractions were increased by 23%, 41% and 10% (p < 0.05), respectively. The Cd in rice grain was reduced by 55% for early rice and 63% for late rice (p < 0.05) and in some cases was reduced to below the Chinese allowable limit (0.2 mg kg-1). High annual fluctuations in rice grain Cd could be caused by variations in the field water regime and in rainfall. With consecutive liming, the soil pH, DTPA-Cd and rice grain Cd varied greatly in the first three seasons and then remained relatively less variable. Meanwhile, soil available nutrients (N, P and K) and rice grain yield were little affected by liming. Soil DTPA-Cd linearly decreased with increasing soil pH, while the reduction of Cd in rice grain logarithmically decreased with increasing soil pH and the reduction in soil DTPA-Cd in the heading stage, indicating potential implications for forecasting rice grain Cd content. Therefore, consecutive liming with quicklime can be recommended for the remediation of Cd-contaminated acidic paddy fields, though supplementary measures are still necessary.

Authors+Show Affiliations

College of Resources & Environment, Hunan Agricultural University, Changsha, 410128, China.College of Resources & Environment, Hunan Agricultural University, Changsha, 410128, China. Electronic address: shenghao82@hunau.edu.cn.Key Laboratory of Agro-ecological Processes in the Subtropical Region, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, 410125, China.College of Resources & Environment, Hunan Agricultural University, Changsha, 410128, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31706567

Citation

Huang, Yong, et al. "Remediation of Cd-contaminated Acidic Paddy Fields With Four-year Consecutive Liming." Ecotoxicology and Environmental Safety, vol. 188, 2020, p. 109903.
Huang Y, Sheng H, Zhou P, et al. Remediation of Cd-contaminated acidic paddy fields with four-year consecutive liming. Ecotoxicol Environ Saf. 2020;188:109903.
Huang, Y., Sheng, H., Zhou, P., & Zhang, Y. (2020). Remediation of Cd-contaminated acidic paddy fields with four-year consecutive liming. Ecotoxicology and Environmental Safety, 188, 109903. https://doi.org/10.1016/j.ecoenv.2019.109903
Huang Y, et al. Remediation of Cd-contaminated Acidic Paddy Fields With Four-year Consecutive Liming. Ecotoxicol Environ Saf. 2020 Jan 30;188:109903. PubMed PMID: 31706567.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Remediation of Cd-contaminated acidic paddy fields with four-year consecutive liming. AU - Huang,Yong, AU - Sheng,Hao, AU - Zhou,Ping, AU - Zhang,Yangzhu, Y1 - 2019/11/07/ PY - 2019/07/24/received PY - 2019/10/28/revised PY - 2019/10/30/accepted PY - 2019/11/11/pubmed PY - 2020/2/19/medline PY - 2019/11/11/entrez KW - Cadmium KW - Cd fractions KW - Consecutive liming KW - Paddy field SP - 109903 EP - 109903 JF - Ecotoxicology and environmental safety JO - Ecotoxicol Environ Saf VL - 188 N2 - Liming has been widely used to remediate Cd-contaminated acidic soils, but the effects of consecutive liming are still unclear. Four-year liming experiments were conducted to assess the remediation of Cd-contaminated acidic paddy fields in a double rice cropping system. With four-year consecutive liming (quicklime, 2.25 t ha-1 per season), the soil pH was increased by an average of 0.57 units (0.10-1.16 units), while the soil DTPA-Cd and available Fe and Mn were reduced by 9%, 19% and 31% (p < 0.05), respectively. The exchangeable plus water-soluble Cd fraction in soil was reduced by 17%, while the soil carbonate-, Fe/Mn oxide- and organic-bound Cd fractions were increased by 23%, 41% and 10% (p < 0.05), respectively. The Cd in rice grain was reduced by 55% for early rice and 63% for late rice (p < 0.05) and in some cases was reduced to below the Chinese allowable limit (0.2 mg kg-1). High annual fluctuations in rice grain Cd could be caused by variations in the field water regime and in rainfall. With consecutive liming, the soil pH, DTPA-Cd and rice grain Cd varied greatly in the first three seasons and then remained relatively less variable. Meanwhile, soil available nutrients (N, P and K) and rice grain yield were little affected by liming. Soil DTPA-Cd linearly decreased with increasing soil pH, while the reduction of Cd in rice grain logarithmically decreased with increasing soil pH and the reduction in soil DTPA-Cd in the heading stage, indicating potential implications for forecasting rice grain Cd content. Therefore, consecutive liming with quicklime can be recommended for the remediation of Cd-contaminated acidic paddy fields, though supplementary measures are still necessary. SN - 1090-2414 UR - https://www.unboundmedicine.com/medline/citation/31706567/Remediation_of_Cd_contaminated_acidic_paddy_fields_with_four_year_consecutive_liming_ DB - PRIME DP - Unbound Medicine ER -