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Tillage practices and straw-returning methods affect topsoil bacterial community and organic C under a rice-wheat cropping system in central China

The objective of this study was to investigate how the relationships between bacterial communities and organic C (SOC) in topsoil (0–5 cm) are affected by tillage practices [conventional intensive tillage (CT) or no-tillage (NT)] and straw-returning methods [crop straw returning (S) or removal (NS)]...

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Autores principales: Guo, Lijin, Zheng, Shixue, Cao, Cougui, Li, Chengfang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5017303/
https://www.ncbi.nlm.nih.gov/pubmed/27611023
http://dx.doi.org/10.1038/srep33155
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author Guo, Lijin
Zheng, Shixue
Cao, Cougui
Li, Chengfang
author_facet Guo, Lijin
Zheng, Shixue
Cao, Cougui
Li, Chengfang
author_sort Guo, Lijin
collection PubMed
description The objective of this study was to investigate how the relationships between bacterial communities and organic C (SOC) in topsoil (0–5 cm) are affected by tillage practices [conventional intensive tillage (CT) or no-tillage (NT)] and straw-returning methods [crop straw returning (S) or removal (NS)] under a rice-wheat rotation in central China. Soil bacterial communities were determined by high-throughput sequencing technology. After two cycles of annual rice-wheat rotation, compared with CT treatments, NT treatments generally had significantly more bacterial genera and monounsaturated fatty acids/saturated fatty acids (MUFA/STFA), but a decreased gram-positive bacteria/gram-negative bacteria ratio (G(+)/G(−)). S treatments had significantly more bacterial genera and MUFA/STFA, but had decreased G(+)/G(−) compared with NS treatments. Multivariate analysis revealed that Gemmatimonas, Rudaea, Spingomonas, Pseudomonas, Dyella, Burkholderia, Clostridium, Pseudolabrys, Arcicella and Bacillus were correlated with SOC, and cellulolytic bacteria (Burkholderia, Pseudomonas, Clostridium, Rudaea and Bacillus) and Gemmationas explained 55.3% and 12.4% of the variance in SOC, respectively. Structural equation modeling further indicated that tillage and residue managements affected SOC directly and indirectly through these cellulolytic bacteria and Gemmationas. Our results suggest that Burkholderia, Pseudomonas, Clostridium, Rudaea, Bacillus and Gemmationas help to regulate SOC sequestration in topsoil under tillage and residue systems.
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spelling pubmed-50173032016-09-12 Tillage practices and straw-returning methods affect topsoil bacterial community and organic C under a rice-wheat cropping system in central China Guo, Lijin Zheng, Shixue Cao, Cougui Li, Chengfang Sci Rep Article The objective of this study was to investigate how the relationships between bacterial communities and organic C (SOC) in topsoil (0–5 cm) are affected by tillage practices [conventional intensive tillage (CT) or no-tillage (NT)] and straw-returning methods [crop straw returning (S) or removal (NS)] under a rice-wheat rotation in central China. Soil bacterial communities were determined by high-throughput sequencing technology. After two cycles of annual rice-wheat rotation, compared with CT treatments, NT treatments generally had significantly more bacterial genera and monounsaturated fatty acids/saturated fatty acids (MUFA/STFA), but a decreased gram-positive bacteria/gram-negative bacteria ratio (G(+)/G(−)). S treatments had significantly more bacterial genera and MUFA/STFA, but had decreased G(+)/G(−) compared with NS treatments. Multivariate analysis revealed that Gemmatimonas, Rudaea, Spingomonas, Pseudomonas, Dyella, Burkholderia, Clostridium, Pseudolabrys, Arcicella and Bacillus were correlated with SOC, and cellulolytic bacteria (Burkholderia, Pseudomonas, Clostridium, Rudaea and Bacillus) and Gemmationas explained 55.3% and 12.4% of the variance in SOC, respectively. Structural equation modeling further indicated that tillage and residue managements affected SOC directly and indirectly through these cellulolytic bacteria and Gemmationas. Our results suggest that Burkholderia, Pseudomonas, Clostridium, Rudaea, Bacillus and Gemmationas help to regulate SOC sequestration in topsoil under tillage and residue systems. Nature Publishing Group 2016-09-09 /pmc/articles/PMC5017303/ /pubmed/27611023 http://dx.doi.org/10.1038/srep33155 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Guo, Lijin
Zheng, Shixue
Cao, Cougui
Li, Chengfang
Tillage practices and straw-returning methods affect topsoil bacterial community and organic C under a rice-wheat cropping system in central China
title Tillage practices and straw-returning methods affect topsoil bacterial community and organic C under a rice-wheat cropping system in central China
title_full Tillage practices and straw-returning methods affect topsoil bacterial community and organic C under a rice-wheat cropping system in central China
title_fullStr Tillage practices and straw-returning methods affect topsoil bacterial community and organic C under a rice-wheat cropping system in central China
title_full_unstemmed Tillage practices and straw-returning methods affect topsoil bacterial community and organic C under a rice-wheat cropping system in central China
title_short Tillage practices and straw-returning methods affect topsoil bacterial community and organic C under a rice-wheat cropping system in central China
title_sort tillage practices and straw-returning methods affect topsoil bacterial community and organic c under a rice-wheat cropping system in central china
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5017303/
https://www.ncbi.nlm.nih.gov/pubmed/27611023
http://dx.doi.org/10.1038/srep33155
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