Drought-induced soil microbial amino acid and polysaccharide change and their implications for C-N cycles in a climate change world

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dc.contributor.authorKakumanu, Madhavi L.en
dc.contributor.authorMa, Lien
dc.contributor.authorWilliams, Mark A.en
dc.contributor.departmentSchool of Plant and Environmental Sciencesen
dc.date.accessioned2019-11-19T18:42:58Zen
dc.date.available2019-11-19T18:42:58Zen
dc.date.issued2019-07-29en
dc.description.abstractHigh microbial carbon (MBC) demand, a proxy for energy demand (cost), during soil microbial response to stressors such as drought are a major gap in understanding global biogeochemical cycling of carbon (C) and nitrogen (N). The dynamics of two dominant microbial pools (amino acids; AA and exopolymeric substances; EPS) in soils exposed to drying and C and N amendment to mimic both low and high nutrient soil habitats were examined. It was hypothesized that dynamics of EPS and AA (osmolytes) would be greater when soil drying was preceded by a pulse of bioavailable C and N. Drying reduced AA content, even as overall soil MBC increased (similar to 35%). The increase in absolute amounts and mol% of certain AA (eg: Taurine, glutamine, tyrosine, phenylalanine) in the driest treatment (-10 MPa) were similar in both soils regardless of amendment suggesting a common mechanism underlying the energy intensive acclimation across soils. MBC and EPS, both increased similar to 1.5X and similar to 3X due to drying and especially drying associated with amendment. Overall major pools of C and N based microbial metabolites are dynamic to drying (drought), and thus have implications for earth's biogeochemical fluxes of C and N, perhaps costing 4-7% of forest fixed photosynthetic C input during a single drying (drought) period.en
dc.description.notesFunds to conduct the research were provided by Virginia Tech College of Agriculture and Life Sciences and a USDA-NIFA award (grant#2011-03815). A special thanks is extended to the laboratory help of Tara Underwood and Ashley Rhodes.en
dc.description.sponsorshipVirginia Tech College of Agriculture and Life Sciences; USDA-NIFA award [2011-03815]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1038/s41598-019-46984-1en
dc.identifier.eissn2045-2322en
dc.identifier.other10968en
dc.identifier.pmid31358788en
dc.identifier.urihttp://hdl.handle.net/10919/95814en
dc.identifier.volume9en
dc.language.isoenen
dc.publisherSpringer Natureen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titleDrought-induced soil microbial amino acid and polysaccharide change and their implications for C-N cycles in a climate change worlden
dc.title.serialScientific Reportsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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