Converse Responses of Biochar Application on N2O Emissions in Soils at Different pH Values in a Subtropical Citrus Orchard
文献类型： 外文期刊
作者： Qian, Xiaojie 1 ; Chen, Hongmei 1 ; Li, Qinghua 1 ; Wang, Fei 1 ;
作者机构： 1.Fujian Acad Agr Sci, Inst Resources Environm & Soil Fertilizer, Fuzhou 350013, Peoples R China
2.Fujian Agr & Forestry Univ, Coll Resources & Environm, Fuzhou 350002, Peoples R China
关键词： nitrous oxide; biochar; pH; subtropical citrus orchards; nitrification; denitrification
期刊名称：AGRONOMY-BASEL （ 影响因子：3.4； 五年影响因子：3.8 ）
ISSN：
年卷期： 2024 年 14 卷 8 期
页码：
收录情况： SCI
摘要： The aim of this study was to explore the effect of biochar on N2O emissions in soils with different pH levels. Soils with five pH levels (4.0, 5.1, 5.8, 6.6, and 7.2) were incubated in two conditions, with 0% biochar (CK) and 1% biochar (BC), for 23 days. N2O emissions were measured at nine time points, and soil chemical properties, AOA-amoA, AOB-amoA, nirK, nirS, and nosZ, were analyzed. Partial least squares path modelling (PLS-PM) was used to assess the effect of nitrification and denitrification pathways on potential N2O emissions. The results showed that biochar reduced N2O emissions in highly acidic soil (pH 4.0) but increased emissions in soils with pH values ranging from 5.1 to 7.2. In highly acidic soils, decreased N2O emission was associated with increased soil pH (p < 0.05) and decreased dissolved organic carbon content (p < 0.05), leading to higher nosZ gene abundance (p < 0.05). Meanwhile, in acidic to neutral soils, biochar application increased soil pH (6.6-11.7%), dissolved organic nitrogen (5.9-29.5%), dissolved organic carbon (8.6-41.0%), stimulated AOB-amoA, nirK, nirS gene abundance (p < 0.05), and thus increased N2O emissions. The results verified the influence of nitrification and denitrification genes on N2O production in soils with different pH values. In conclusion, biochar had different effects on N2O emissions based on soil pH, highlighting the need to consider pH when using biochar to mitigate N2O emissions in subtropical citrus orchards.
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