Huang Xudi, Liu Wenjian, Yun Juanli, Wei Ting, Zhang Chao, Laipan Minwang, Zhang Lei, Li Shan, Yang Jing, Hai Jiangbo, Guo Junkang, Bai Yinping
School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an, China.
Shaanxi University Key Laboratory of Industrial Pollution Control and Environmental Health, Shaanxi University of Science & Technology, Xi'an, China.
Int J Phytoremediation. 2025;27(12):1799-1807. doi: 10.1080/15226514.2025.2522301. Epub 2025 Jun 23.
ABSTRACTSDissolved organic matter (DOM) has different functions that affect the absorption and resolution behavior of soil Cd. We investigated two exogenous DOM (pig manure and rice straw) in soils, analyzed their structural features, and explored their effect on Cd behavior in soil. Our results showed that the two exogenous DOM contain similar functional groups, including carboxylic acids, alcohols, alkanes, phenols, and polysaccharides. The molecular weight of DOM in F2 to F4 (3 kD-30 kD) have the effect of activating and migration of Cd. Pot and field experiments demonstrate that DOM from pig manure is more effective in enhancing soil Cd adsorption and reduces the exchangeable Cd in soil during the seedling stage of rice. Under the treatment of pig manure and straw, the Cd in the roots, stems and leaves of rice decreased by 14%, 11%, 10%, and 8%, 14%, 10%, respectively. It indicates that pig manure application reduces Cd accumulation in rice roots, and straw application reduces it in rice stems. Overall, after applying pig manure and rice straw, Cd concentration in rice grains decreased by 36% and 17%, respectively. This study is conducive to a further understanding the behavior and morphological changes of Cd in paddy soil.
摘要
溶解有机物（DOM）具有不同功能，影响土壤镉的吸附和解吸行为。我们研究了土壤中的两种外源DOM（猪粪和稻草），分析了它们的结构特征，并探讨了它们对土壤中镉行为的影响。我们的结果表明，这两种外源DOM含有相似的官能团，包括羧酸、醇类、烷烃、酚类和多糖。F2至F4中DOM的分子量（3 kD - 30 kD）具有激活和迁移镉的作用。盆栽和田间试验表明，猪粪中的DOM在水稻苗期更有效地增强土壤对镉的吸附，并降低土壤中的交换性镉。在猪粪和稻草处理下，水稻根、茎和叶中的镉分别降低了14%、11%、10%和8%、14%、10%。这表明施用猪粪减少了水稻根部的镉积累，施用稻草减少了水稻茎部的镉积累。总体而言，施用猪粪和稻草后，水稻籽粒中的镉浓度分别降低了36%和17%。本研究有助于进一步了解稻田土壤中镉的行为和形态变化。
