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Compared to conventional, ecological intensive management promotes beneficial proteolytic soil microbial communities for agro-ecosystem functioning under climate change-induced rain regimes
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Edité par CCSD ; Nature Publishing Group -
International audience. Projected climate change and rainfall variability will affect soil microbial communities, biogeochemicalcycling and agriculture. Nitrogen (N) is the most limiting nutrient in agroecosystems and its cyclingand availability is highly dependent on microbial driven processes. In agroecosystems, hydrolysis oforganic nitrogen (N) is an important step in controlling soil N availability. We analyzed the effect ofmanagement (ecological intensive vs. conventional intensive) on N-cycling processes and involvedmicrobial communities under climate change-induced rain regimes. Terrestrial model ecosystemsoriginating from agroecosystems across Europe were subjected to four different rain regimes for 263days. Using structural equation modelling we identified direct impacts of rain regimes on N-cyclingprocesses, whereas N-related microbial communities were more resistant. In addition to rain regimes,management indirectly affected N-cycling processes via modifications of N-related microbialcommunity composition. Ecological intensive management promoted a beneficial N-related microbialcommunity composition involved in N-cycling processes under climate change-induced rain regimes.Exploratory analyses identified phosphorus-associated litter properties as possible drivers for theobserved management effects on N-related microbial community composition. This work providesnovel insights into mechanisms controlling agro-ecosystem functioning under climate change.
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