Mapping and determinism of soil microbial community distribution across an agricultural landscape.

Abstract:

: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 13 km². 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.

journal_name

Microbiologyopen

journal_title

MicrobiologyOpen

authors

Constancias F,Terrat S,Saby NP,Horrigue W,Villerd J,Guillemin JP,Biju-Duval L,Nowak V,Dequiedt S,Ranjard L,Chemidlin Prévost-Bouré N

doi

10.1002/mbo3.255

subject

Has Abstract

pub_date

2015-06-01 00:00:00

pages

505-17

issue

3

issn

2045-8827

journal_volume

4

pub_type

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