Microbial resistance and resilience to drought and rewetting modulate soil N2O emissions with different fertilizers

Xu Xiaoya, Liu Yaowei, Tang Caixian, Yang Yihan, Yu Lei, Lesueur Didier, Herrmann Laetitia, Di Hongjie, Li Yong, Li Qinfen, Xu Jianming. 2024. Microbial resistance and resilience to drought and rewetting modulate soil N2O emissions with different fertilizers. Science of the Total Environment, 917:170380, 11 p.

Résumé : Future climate models indicate an enhanced severity of regional drought and frequent rewetting events, which may cause cascading impacts on soil nitrogen cycle and nitrous oxide (N2O) emissions, but the underlying microbial mechanism remains largely unknown. Here we report an incubation study that examined the impacts of soil moisture status and nitrification inhibitor (DCD) on the N2O-producers and N2O-reducers following the application of urea and composted swine manure in an acid soil. The soil moisture treatments included 100 % water-holding capacity (WHC) (wetting, 35.3 % gravimetric soil water content), 40 % WHC (drought, 7 % gravimetric soil water content), and 40 % to 100 % WHC (rewetting). The results showed that N2O emissions were significantly decreased under drought conditions and were significantly increased after rewetting. The resistance of ammonia-oxidizing bacteria and nosZII, which was inhibited by urea or manure application, modulated N2O emissions under drought conditions. The resilience of the functional guilds modulated their dominant role in N2O emissions with rewetting. Ammonia-oxidizing bacteria, nirS-type denitrifying bacteria and nosZI showed significant resilience in response to rewetting. Significant negative relationships were observed between N2O emissions and nosZII clade under wetting condition and between N2O emissions and nosZI clade after rewetting. Our results highlighted the importance of microbial resistance and resilience in modulating N2O emissions, which help to better understand the dominant way of N2O emissions, and consequently make efficient mitigation strategies under the global climate change.

Mots-clés Agrovoc : fertilisation, résistance à la sécheresse, inhibiteur de nitrification, cycle de l'azote, changement climatique, fertilité du sol, teneur en eau du sol, oxyde nitreux, atténuation des effets du changement climatique, sécheresse, cycle du carbone

Mots-clés libres : Greenhouse gas emissions, Drought-rewetting, N cycle, Microbial responses, Enhanced-efficiency fertilizer

Classification Agris : P30 - Sciences et aménagement du sol
P34 - Biologie du sol
F04 - Fertilisation

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

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

Auteurs et affiliations

• Xu Xiaoya, Zhejiang University (CHN)
• Liu Yaowei, Zhejiang University (CHN)
• Tang Caixian, La Trobe University (AUS)
• Yang Yihan, Shandong Normal University (CHN)
• Yu Lei, Shandong Agricultural Technology Extension Center (CHN)
• Lesueur Didier, CIRAD-PERSYST-UMR Eco&Sols (VNM) ORCID: 0000-0002-6694-0869
• Herrmann Laetitia, CIAT (VNM)
• Di Hongjie, Zhejiang University (CHN)
• Li Yong, Zhejiang University (CHN) - auteur correspondant
• Li Qinfen, CATAS (CHN)
• Xu Jianming, Zhejiang University (CHN)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/608080/)

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