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<p>Rice paddies, a major anthropogenic source of atmospheric methane (CH<sub>4</sub>), currently face significant cadmium (Cd) pollution. China has a substantial storage of phosphogypsum intended to enhance arable soil fertility. However, little is known about the impact of phosphogypsum on synergic Cd pollution and CH<sub>4</sub> emission in rice paddies. In this study, we conducted a pot experiment to assess the effects of phosphogypsum, combined with Cd remediation agents such as sulfhydryl-modified palygorskite (SMP), bacillus subtilis (BS), and selenium foliar fertilizer (SFF), on soil and rice Cd contents and CH<sub>4</sub> emissions. We found that a large amount of phosphogypsum (2250&#xa0;kg&#xa0;ha<sup>−1</sup>) can significantly reduce the bioavailable Cd content in soils. Combining remediation agents with phosphogypsum effectively reduced Cd levels in brown rice. Phosphogypsum can significantly reduce CH<sub>4</sub> emissions from rice paddies, resulting in cumulative evasion rates of 255.54–633.63&#xa0;kg&#xa0;hm<sup>−2</sup>. Our results demonstrate that phosphogypsum paired with Cd remediation agents effectively reduces Cd contamination in brown rice and CH<sub>4</sub> emissions from rice paddies, providing insights into the synergistic management of heavy metal pollution and greenhouse gas emissions in agricultural environments.</p>

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Phosphogypsum and cadmium remediation agents: A synergy for mitigating Cd contamination and CH4 emissions in rice paddies

  • 期刊论文

  • 发表日期：

    2025年3月18日

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  • Wangbiao Lu,
  • Chengling Huang,
  • Weijun Luo,
  • Qi Zhang,
  • Xu Huang,
  • Yongcheng Jin,
  • Chen Yao,
  • Xiaowen Li,
  • Guangneng Zeng,
  • Fang Yang,
  • Liang Tang,
  • Shi-Jie Wang

摘要

Rice paddies, a major anthropogenic source of atmospheric methane (CH4), currently face significant cadmium (Cd) pollution. China has a substantial storage of phosphogypsum intended to enhance arable soil fertility. However, little is known about the impact of phosphogypsum on synergic Cd pollution and CH4 emission in rice paddies. In this study, we conducted a pot experiment to assess the effects of phosphogypsum, combined with Cd remediation agents such as sulfhydryl-modified palygorskite (SMP), bacillus subtilis (BS), and selenium foliar fertilizer (SFF), on soil and rice Cd contents and CH4 emissions. We found that a large amount of phosphogypsum (2250 kg ha−1) can significantly reduce the bioavailable Cd content in soils. Combining remediation agents with phosphogypsum effectively reduced Cd levels in brown rice. Phosphogypsum can significantly reduce CH4 emissions from rice paddies, resulting in cumulative evasion rates of 255.54–633.63 kg hm−2. Our results demonstrate that phosphogypsum paired with Cd remediation agents effectively reduces Cd contamination in brown rice and CH4 emissions from rice paddies, providing insights into the synergistic management of heavy metal pollution and greenhouse gas emissions in agricultural environments.