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Library Soil microbial diversity and C turnover modified by tillage and cropping in Laos tropical grassland

Soil microbial diversity and C turnover modified by tillage and cropping in Laos tropical grassland

Soil microbial diversity and C turnover modified by tillage and cropping in Laos tropical grassland

Resource information

Date of publication
декабря 2013
Resource Language
ISBN / Resource ID
AGRIS:US201400145667
Pages
391-398

Agricultural practices should modify the diversity of soil microbes. However, the precise relationships between soil properties and microbial diversity are poorly known. Here, we study the effect of agricultural management on soil microbial diversity and C turnover in tropical grassland of north-eastern Laos. Three years after native grassland conversion into agricultural land, we compared soils from five land use management systems: one till versus two no-till rotational cropping systems, one no-till improved pasture and the natural grassland. Soils were incubated in microcosms during 64� days at optimum temperature and humidity. Bacterial and fungal diversity were evaluated by metagenomic 454-pyrosequencing of 16S and 18SrRNA genes, respectively. Changes in soil respiration patterns were evaluated by monitoring ¹²C- and ¹³C-CO₂ release after soil amendment with 13C-labelled wheat residues. Results show that residue mineralization increased with bacterial richness and diversity in the tilled treatment 7� days after soil amendment. Native soil organic C mineralization and priming effect increased with fungal richness and diversity in improved pasture and natural grassland. No-till cropping systems represented intermediate situations between tillage and pasture systems. Our findings evidence the potential of controlling soil microbial diversity by agricultural practices to improve soil biological properties. We suggest the promotion of no-till systems as a fair compromise between the need for agriculture intensification and soil ecological processes preservation.

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Authors and Publishers

Author(s), editor(s), contributor(s)

Lienhard, Pascal
Terrat, Sébastien
Mathieu, Olivier
Levêque, Jean
Chemidlin Prévost-Bouré, Nicolas
Nowak, Virginie
Régnier, Tiffanie
Faivre, Céline
Sayphoummie, Sengphanh
Panyasiri, Khamkéo
Tivet, Florent
Ranjard, Lionel
Maron, Pierre-Alain

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