数字农科院2.0

Targeted preparation of oxygen- and aromatic-rich humic acid for decreasing urea nitrogen loss: Characterization, performance, and mechanism

文献类型： 外文期刊

作者： Yingqiang Zhang;Shuiqin Zhang;Meng Xu;Jianyuan Jing;Jiukai Xu;Yanting Li;Bingqiang Zhao;Liang Yuan

作者机构：

关键词： High aromaticity;N-cycling-genes;Oxygen-rich humic acid;Selective catalyst;Urea transformation

期刊名称： Industrial Crops and Products

ISSN： 0926-6690

年卷期： 2025 年 235 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Humic acids (HA) with abundant oxygen and aromatic structures possess a huge potential for improving the nitrogen utilization efficiency in agriculture. However, the conventional oxygen-enhancing methods lead to the loss of the HA aromatic structure. This study employed a novel catalyst (CuO@Fe2O3) enriched with oxygen vacancies and redox system to target prepare the oxygen- and aromatic-rich humic acid (AHA) during a H2O2-mediated oxidation process. Compared with raw HA (RHA), AHA exhibited a 4.8 % higher oxygen and comparable condensed aromatic content, which was attributed to the selectively breaking C-O bonds. Next, urea fertilizers enhanced with RHA (RHAU) and AHA (AHAU) were prepared. Soil incubation experiments revealed that compared with RHAU, AHAU exhibited 8.6 % lower NH3 volatilization losses by delaying urea hydrolysis (via urease inhibition) and enhancing nitrification rate (mainly by increasing the ammonia-oxidizing bacteria abundance). AHAU also decreased cumulative N₂O emissions by influencing denitrifying microbes. This targeted preparation strategy successfully overcomes the oxygen and aromatic structure trade-off in HA modification, offering a highly practical and efficient HA material for environment-friendly and high-efficiency nitrogen fertilizers.

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