High quality residues from cover crops favor changes in microbial community and enhance C and N sequestration
The objective of the study was to evaluate the effect of a change in management on the soil microbial community and C sequestration. We conducted a 3-year field study in La Pampa (Argentina) with rotation of sorghum (Sorghum bicolor) in zero tillage alternating with rye (Secale cereale) and vetch (Vicia villosa ssp. dasycarpa). Soil was sampled once a year at two depths. Soil organic matter fractions, dissolved organic matter, microbial biomass (MBC) and community composition (DNA extraction, qPCR, and phospholipid FAME profiles) were determined. Litter, aerial- and root biomass were collected and all material was analyzed for C and N. Results showed a rapid response of microbial biomass to a bacterial dominance independent of residue quality. Vetch had the highest diversity index, while the fertilized treatment had the lowest one. Vetch–sorghum rotation with high N mineralization rates and diverse microbial community sequestered more C and N in stable soil organic matter fractions than no-till sorghum alone or with rye, which had lower N turnover rates. These results reaffirm the importance of enhanced soil biodiversity for maintaining soil ecosystem functioning and services. The supply of high amounts of N-rich residues as provided by grass–legume cover crops could fulfill this objective.
| Main Authors: | , , , , , |
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| Format: | info:eu-repo/semantics/article biblioteca |
| Language: | eng |
| Published: |
2016
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| Subjects: | Plantas de Cobertura, Nitrógeno, Carbón, Ecología Microbiana, Cover Plants, Nitrogen, Coil, Microbial Ecology, Cultivos de Cobertura, |
| Online Access: | http://hdl.handle.net/20.500.12123/1086 http://ac.els-cdn.com/S2351989416300117/1-s2.0-S2351989416300117-main.pdf?_tid=bf0879b8-8e4d-11e7-a898-00000aab0f02&acdnat=1504185202_3e90601982194b60b434c6ed5a2644ac https://doi.org/10.1016/j.gecco.2016.03.009 |
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