Hydrochar as a Potential Soil Conditioner for Mitigating H+ Production in the Nitrogen Cycle: A Comparative Study
文献类型： 外文期刊
第一作者： Yu, Weijia
作者： Yu, Weijia;Yu, Weijia;Zhang, Qingyue;Huai, Shengchang;Jin, Yuwen;Lu, Changai
作者机构：
关键词： hydrochar; net proton production; soil nitrification; nitrate leaching; ammonia-oxidizing microorganisms; dissolved organic carbon
期刊名称：AGRONOMY-BASEL （ 影响因子：3.4； 五年影响因子：3.8 ）
ISSN：
年卷期： 2025 年 15 卷 8 期
页码：
收录情况： SCI
摘要： Pyrochar has been identified as a favorable soil conditioner that can effectively ameliorate soil acidification. Hydrochar is considered a more affordable carbon material than pyrochar, but its effect on the process of soil acidification has yet to be investigated. An indoor incubation and a soil column experiment were conducted to study the effect of rice straw hydrochar application on nitrification and NO3--N leaching in acidic red soil. Compared to the control and pyrochar treatments, respectively, hydrochar addition mitigated the net nitrification rate by 3.75-48.75% and 57.92-78.19%, in the early stage of urea fertilization. This occurred mainly because a greater amount of dissolved organic carbon (DOC) was released from hydrochar than the other treatments, which stimulated microbial nitrogen immobilization. The abundances of ammonia-oxidizing archaea and ammonia-oxidizing bacteria were dramatically elevated by 25.62-153.19% and 12.38-22.39%, respectively, in the hydrochar treatments because of DOC-driven stimulation. The cumulative leaching loss of NO3--N in soils amended with hydrochar was markedly reduced by 43.78-59.91% and 61.70-72.82% compared with that in the control and pyrochar treatments, respectively, because hydrochar promoted the soil water holding capacity by 2.70-9.04% and reduced the residual NO3--N content. Hydrochar application can dramatically diminish total H+ production from soil nitrification and NO3--N leaching. Thus, it could be considered an economical soil amendment for ameliorating soil acidification.
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