The interactive effect of temperature and fertilizer types determines the dominant microbes in nitrous oxide emissions and the dicyandiamide efficacy in a vegetable soil

Xu Xiaoya, Liu Haiyang, Liu Yaowei, Lesueur Didier, Herrmann Laetitia, Di Hongjie, Tang Caixian, Xu Jianming, Li Yong. 2024. The interactive effect of temperature and fertilizer types determines the dominant microbes in nitrous oxide emissions and the dicyandiamide efficacy in a vegetable soil. Soil Ecology Letters, 6:230213, 13 p.

Résumé : Dicyandiamide decreased N2O emissions even under 40°C. Ammonia oxidizers and nirS were well adapted to 40°C in manured soils. Fungal nirK tolerated high temperature better in urea than manure treatment. Compared to nosZII, nosZI adapted to all temperature regardless of fertilization. nirS-denitrifier dominated N2O emissions at high temperature in fertilized soil. Heat waves associated with global warming and extreme climates would arouse serious consequences on nitrogen (N) cycle. However, the responses of the functional guilds to different temperatures, especially high temperature and the cascading effect on N2O emissions remain unclear. An incubation study was conducted to examine the effect of different temperatures (20°C, 30°C, and 40°C) and fertilizer types (urea and manure) on N2O-producers and N2O-reducers, as well as the efficacy of dicyandiamide (DCD) on N2O emissions in a vegetable soil. Results showed that ammonia oxidizers and nirS-type denitrifiers were well adapted to high temperature (40°C) with manure application, while the fungal nirK-denitrifiers had better tolerance with urea application. The nosZ clade I microbes had a strong adaptability to various temperatures regardless of fertilization type, while the growth of nosZ clade II group microbes in non-fertilized soil (control) were significantly inhibited at higher temperature. The N2O emissions were significantly decreased with increasing temperature and DCD application (up to 60%, even at 40°C). Under high temperature conditions, fungal denitrifiers play a significant role in N-limited soils (non-fertilized) while nirS-type denitrifiers was more important in fertilized soils in N2O emissions, which should be specially targeted when mitigating N2O emissions under global warming climate.

Mots-clés Agrovoc : fertilisation, engrais azoté, fertilité du sol, réchauffement global, température du sol, oxyde nitreux, propriété physicochimique du sol, engrais organique, micro-organisme du sol

Mots-clés libres : Nitrogen fertilizers, Microorganisms, Nitrification inhibitor, Bacteria, Archaea

Classification Agris : P34 - Biologie du sol
P35 - Fertilité du sol

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Agences de financement hors UE : National Key Research and Development Program of China, Key Research and Development Program of Zhejiang Province, Zhejiang Provincial Natural Science Foundation of China, National Natural Science Foundation of China, Natural Science Foundation of Shandong Province

Auteurs et affiliations

• Xu Xiaoya, Zhejiang University (CHN)
• Liu Haiyang, Zhejiang University (CHN)
• Liu Yaowei, Zhejiang University (CHN)
• Lesueur Didier, CIRAD-PERSYST-UMR Eco&Sols (VNM) ORCID: 0000-0002-6694-0869
• Herrmann Laetitia, CIAT (VNM)
• Di Hongjie, Zhejiang University (CHN)
• Tang Caixian, La Trobe University (AUS)
• Xu Jianming, Zhejiang University (CHN)
• Li Yong, Zhejiang University (CHN) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/608061/)

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