Off-site impacts of agricultural composting: role of terrestrially derived organic matter in structuring aquatic microbial communities and their metabolic potential - Archive ouverte HAL Access content directly
Journal Articles FEMS Microbiology Ecology Year : 2014

Off-site impacts of agricultural composting: role of terrestrially derived organic matter in structuring aquatic microbial communities and their metabolic potential

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Thomas Pommier
  • Function : Author
  • PersonId : 1136612
Asmaa Merroune
  • Function : Author
Yvan Bettarel
  • Function : Author
Patrice Got
  • Function : Author
Jean-Louis Janeau
  • Function : Author
Pascal Jouquet
  • Function : Author
Thuy D. Thu
  • Function : Author
Tran D. Toan
  • Function : Author
Emma Rochelle-Newall
  • Function : Author

Abstract

While considered as sustainable and low-cost agricultural amendments, the impacts of organic fertilizers on downstream aquatic microbial communities remain poorly documented. We investigated the quantity and quality of the dissolved organic matter leaching from agricultural soil amended with compost, vermicompost or biochar and assessed their effects on lake microbial communities, in terms of viral and bacterial abundances, community structure and metabolic potential. The addition of compost and vermicompost significantly increased the amount of dissolved organic carbon in the leachate compared to soil alone. Leachates from these additions, either with or without biochar were highly bioavailable to aquatic microbial communities, though reducing the metabolic potential of the community and harboring more specific communities. Although not affecting bacterial richness or taxonomic distributions, the specific addition of biochar affected the original lake bacterial communities resulting in a strongly different community. This could be partly explained by viral burst and converging bacterial abundances throughout the samples. These results underline the necessity to include off-site impacts of agricultural amendments when considering their cascading effect on downstream aquatic ecosystems. This article is protected by copyright. All rights reserved.

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hal-02487470 , version 1 (21-02-2020)

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Thomas Pommier, Asmaa Merroune, Yvan Bettarel, Patrice Got, Jean-Louis Janeau, et al.. Off-site impacts of agricultural composting: role of terrestrially derived organic matter in structuring aquatic microbial communities and their metabolic potential. FEMS Microbiology Ecology, 2014, 90 (3), pp.622-632. ⟨10.1111/1574-6941.12421⟩. ⟨hal-02487470⟩
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