数字农科院2.0

Nitrous oxide emissions and soil profile responses to manure substitution in the North China Plain drylands

文献类型： 外文期刊

作者： Zhen Wang;Jungai Li;Hongyuan Wang;Bingqian Fan;Muhammad Amjad Bashir;Fuyue Dai;Limei Zhai;Hongbin Liu

作者机构：

关键词： Environmental factors;Manure substitution;N2O concentration;N2O emission

期刊名称： Science of the Total Environment

ISSN： 0048-9697

年卷期： 2024 年 953 卷

页码：

收录情况： SCIE（2024版） ; ; EI（2024版）

摘要： Substituting synthetic fertilizers with manures in agriculture enhances soil properties and crop yield. However, the impact on nitrous oxide (N2O) emissions, especially from the soil profile, remains poorly understood. This study examined emissions from 2017 to 2019 on a well-established (>10-year) maize field site in the North China Plain. Three treatments were compared: 100 % synthetic nitrogen (NPK), 50 % synthetic fertilizer N + 50 % manure N substitution (50%MNS), and 100 % manure N substitution (100%MNS). N2O emissions were monitored for three years, and in 2019, N2O concentrations at 20 cm and 40 cm soil depths were analyzed in relation to surface N2O fluxes and environmental factors. The results showed manure substitution resulted in about 13.8 %–25.2 % (50%MNS) and 40.3 %–72.2 % (100%MNS) reduction in N2O emissions over the 3-year period compared with the NPK treatment. Throughout the maize growing season, the top-dressing accompanied by rainfall was responsible for the N2O emissions. The difference in N2O concentrations between all the treatments at 20 cm depth was insignificant, but at 40 cm depth the N2O concentrations were significantly higher for the 50%MNS treatment than the other treatments. The N2O fluxes and N2O concentration were not synchronized especially in NPK. The decoupled relationship between the N2O fluxes and the N2O concentration in the soil profile depth suggested the contribution of N2O produced in the soil profile to the surface N2O fluxes is limited. This study highlights that manure substitution is an efficient measure to reduce N2O emissions.

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