期刊
FEMS MICROBIOLOGY ECOLOGY
卷 90, 期 3, 页码 622-632出版社
OXFORD UNIV PRESS
DOI: 10.1111/1574-6941.12421
关键词
metabolic potential; lakes; off-site effects; soil leachates
类别
资金
- French EC2CO programme 'COMPAQUA'
- Institut de Recherche pour le Developpement
- UMR laboratory iEES
- UMR laboratory EM
- PHC Hoa Sen Lotus [23970QM]
- LOTUS, MOST [44/2012/HD-NDT]
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 with soil alone. Leachates from these additions, either with or without biochar, were highly bioavailable to aquatic microbial communities, although reducing the metabolic potential of the community and harbouring 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.
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