数字农科院2.0

Long-term manure amendment enhances N2O emissions from acidic soil by alleviating acidification and increasing nitrogen mineralization

文献类型： 外文期刊

作者： Lei Wu;Jing Hu;Muhammad Shaaban;Jun Wang; Kailou Liu;Minggang Xu;Wenju Zhang

关键词： long-term manure amendment;N2O emission;nitrogen mineralization;denitrification;(nirK+nirS)/nosZ

期刊名称： Journal of Integrative Agriculture

ISSN： 2095-3119

年卷期： 2025 年

页码：

收录情况： SCIE（2025版） ; ; CSCD（2025-2026年度） ; ; 科技核心（2024版） ; ; 农林核心（2024版）

摘要： Long-term manure application has the potential to alleviate soil acidification, and increase carbon sequestration and nutrient availability, thus improving cropland fertility. However, the mechanisms behind greenhouse gas N2O emissions from acidic soil mediated by long-term manure application remain poorly understood. Herein, we investigated N2O emission and its linkage with gross N mineralization and nitrification rates, as well as nitrifying and denitrifying microbes in an acidic upland soil subjected to 36-year fertilization treatments, including an unfertilized control (CK), inorganic fertilizer (F), 2 x rate of inorganic fertilizer (2F), manure (M), and the combination of inorganic fertilizer and manure (FM) treatments. Compared to the CK treatment (1.34 μg N kg–1 d–1), fertilization strongly increased N2O emissions by 34-fold on average, with more pronounced increases in the manure-amendment (10.6–169 μg N kg–1 d–1) than those in the inorganic fertilizer treatments (3.26–5.51 μg N kg–1 d–1). The manure amendment-stimulated N2O emissions were highly associated with increased soil pH, mean weight diameter of soil aggregates, substrate availability (e.g., particulate organic carbon, NO3− and available phosphorus), gross N mineralization rates, denitrifier abundances and the (nirK+nirS)/nosZ ratio. These findings suggest that the increased N2O emissions primarily resulted from alleviated acidification, increased substrate availability and improved soil structure, thus enhancing microbial N mineralization and favoring N2O-producing denitrifiers over N2O consumers. Moreover, AOB rather than AOA positively correlated with soil NO3− concentration and N2O emissions, indicating that nitrification indirectly contributed to N2O production by supplying NO3− for denitrification. Collectively, manure amendment potentially stimulates N2O emissions, primarily resulting from alleviated soil acidification and increased substrate availability, thus enhancing N mineralization and denitrifier-mediated N2O production. Our findings suggest that consideration should be given to the greenhouse gas budgets of agricultural ecosystems when applying manure for managing the pH and fertility of acidic soils.

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