| Title | Relationship between microbial composition and substrate use efficiency in tropical soil |
| Publication Type | Journal Article |
| Year of Publication | 2018 |
| Authors | Bonner M.TL, Shoo L.P, Brackin R., Schmidt S. |
| Journal | Geoderma |
| Volume | 315 |
| Pagination | 96-103 |
| Date Published | Apr |
| Type of Article | Article |
| ISBN Number | 0016-7061 |
| Accession Number | WOS:000424178600011 |
| Keywords | Agriculture, Bacteria, Bacterial community structure, biomass, Carbon sequestration, decomposition, Fungi, IMPACT, litter, litter decomposition, MATTER, Microcosms, organic-carbon stocks, pinus-massoniana, rain-forests, secondary forest, Selective inhibitors |
| Abstract | Soil organic matter (SOM) is crucial to soil health, supporting most of the soil properties that benefit plant growth and ecosystem services including carbon sequestration, nutrient recycling and water infiltration. Recent study is exposing the soil microbial community as not only decomposing SOM, but also providing the primary source of chemicals for its formation. All else equal, SOM formation is theoretically greatest when microbes maximise enzyme efficiency (ratio of enzyme activity to carbon loss from respiration) and biomass efficiency (biomass gain per unit substrate added). Our study examines the relationship between microbial composition and metrics of these two efficiencies. We hypothesised that both will increase with higher ratios of soil fungi to bacteria. We manipulated microbial composition through sustained use of selective microbial inhibitors in microcosms with tropical soil, alongside variation of litter quality and diversity and the presence or absence of a simulated root exudate. Both litter and inhibitor treatments significantly changed soil microbial composition and function, and enzyme efficiency and biomass efficiency were both higher in microbial communities with more fungi, supporting our hypothesis. Structural equation modelling suggested that the observed efficiency changes did indeed occur in part via changes in microbial composition after accounting for direct effects of treatments. Taken together the results provide some support for the hypothesis that soil fungi benefit SOM formation.
|
| Alternate Journal | Geoderma |
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Bonner, Mark T. L. Shoo, Luke P. Brackin, Richard Schmidt, Susanne
Australian National Soil Carbon Research Program; Australian Postgraduate Award
We would like to thank Maren Westermann and Stephane Guillou for their invaluable advice and assistance in the laboratory, Shi Ling Ling and Peter Mortimer for logistical support with samples, as well as Noel Preece and Penny van Oosterzee for allowing soil and litter to be taken from their land for the present experiment. This study was funded by the Australian National Soil Carbon Research Program, and an Australian Postgraduate Award for MTLB. The funding sources had no involvement in study design, nor in data collection, analysis or interpretation, nor in report writing or the decision to submit for publication.
Elsevier science bv
Amsterdam
1872-6259
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Bonner, MTL (reprint author), Univ Queensland, Sch Agr & Food Sci, Brisbane, Qld 4072, Australia.
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