Properties of soil pore space regulate pathways of plant residue decomposition and community structure of associated bacteria
Physical protection of soil carbon (C) is one of the important components of C storage. However, its exact mechanisms are still not sufficiently lucid. The goal of this study was to explore the influence of soil structure, that is, soil pore spatial arrangements, with and without presence of plant residue on (i) decomposition of added plant residue, (ii) CO₂ emission from soil, and (iii) structure of soil bacterial communities. The study consisted of several soil incubation experiments with samples of contrasting pore characteristics with/without plant residue, accompanied by X-ray micro-tomographic analyses of soil pores and by microbial community analysis of amplified 16S–18S rRNA genes via pyrosequencing. We observed that in the samples with substantial presence of air-filled well-connected large (>30 µm) pores, 75–80% of the added plant residue was decomposed, cumulative CO₂ emission constituted 1,200 µm C g⁻¹ soil, and movement of C from decomposing plant residue into adjacent soil was insignificant. In the samples with greater abundance of water-filled small pores, 60% of the added plant residue was decomposed, cumulative CO₂ emission constituted 2,000 µm C g⁻¹ soil, and the movement of residue C into adjacent soil was substantial. In the absence of plant residue the influence of poremore »
- Institute for Advanced Sustainability Studies, Potsdam (Germany). IASS-Global Soil Forum.
- Michigan State Univ., East Lansing, MI (United States). Dept. of Plant, Soil and Microbial Sciences.
- Michigan State Univ., East Lansing, MI (United States). Dept. of Microbiology and Molecular Genetics.
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Publication Date:
- OSTI Identifier:
- Accepted Manuscript
- Journal Name:
- PLoS ONE
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 4; Journal ID: ISSN 1932-6203
- Public Library of Science
- Research Org:
- Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
- Sponsoring Org:
- Country of Publication:
- United States
- 54 ENVIRONMENTAL SCIENCES leaves; carbon dioxide; maize; plant communities; porosity; community structure; fluid dynamics; Shannon index