Mapping and determinism of soil microbial community distribution across an agricultural landscape
2015
Constancias, Florentin | Terrat, Sébastien | Saby, Nicolas | Horrigue, Walid | Villerd, Jean | Guillemin, Jean-Philippe | Biju-Duval, Luc | Nowak, Virginie | Dequiedt, Samuel, S. | Ranjard, Lionel | Chemidlin Prévost-Bouré, Nicolas | Agroécologie [Dijon] ; Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement | InfoSol (InfoSol) ; Institut National de la Recherche Agronomique (INRA) | Laboratoire Agronomie et Environnement (LAE) ; Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL) | French state through the National Agency for Research under the program "Investments for the Future" [ANR-11-INBS-0001]; Regional Council of Burgundy | ANR-11-INBS-0001,ANAEE-FR,ANAEE-Services(2011)
Article en open access
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Afficher plus [+] Moins [-]anglais. Despite the relevance of landscape, regarding the spatial patterning of microbial communities and the relative influence of environmental parameters versus human activities, few investigations have been conducted at this scale. Here, we used a systematic grid to characterize the distribution of soil microbial communities at 278 sites across a monitored agricultural landscape of 13km(2). Molecular microbial biomass was estimated by soil DNA recovery and bacterial diversity by 16S rRNA gene pyrosequencing. Geostatistics provided the first maps of microbial community at this scale and revealed a heterogeneous but spatially structured distribution of microbial biomass and diversity with patches of several hundreds of meters. Variance partitioning revealed that both microbial abundance and bacterial diversity distribution were highly dependent of soil properties and land use (total variance explained ranged between 55% and 78%). Microbial biomass and bacterial richness distributions were mainly explained by soil pH and texture whereas bacterial evenness distribution was mainly related to land management. Bacterial diversity (richness, evenness, and Shannon index) was positively influenced by cropping intensity and especially by soil tillage, resulting in spots of low microbial diversity in soils under forest management. Spatial descriptors also explained a small but significant portion of the microbial distribution suggesting that landscape configuration also shapes microbial biomass and bacterial diversity.
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