Skip to Main Content
Immobilization and mineralization of N and P by heterotrophic microbes during leaf decompositionAuthor(s): Beth Cheever; Erika Kratzer; Jackson Webster
Source: Freshwater Science. 31(1): 133-147
Publication Series: Scientific Journal (JRNL)
Station: Southern Research Station
Download Publication (656.95 KB)
DescriptionAccording to theory, the rate and stoichiometry of microbial mineralization depend, in part, on nutrient availability. For microbes associated with leaves in streams, nutrients are available from both the water column and the leaf. Therefore, microbial nutrient cycling may change with nutrient availability and during leaf decomposition. We explored spatial and temporal patterns of mineralization by heterotrophic microbes by placing packs of red maple leaves at sites in 5 Appalachian streams spanning a range of N and P availability. We collected packs 4 times from each site. Leaf disks from these packs were incubated in microcosms, and uptake rates and steady-state concentrations of NH4+ and soluble reactive P (SRP) were used to calculate mineralization rates. N uptake peaked between 50 and 60 d, whereas P uptake peaked ~10 d later. Clear patterns were found for fungal biomass-specific uptake or mineralization fluxes of either nutrient over time or space, but the microbes grown in the site with the lowest nutrient availability had the highest fungal biomass-specific cycling. The ability of microbes to access nutrients from their substrate may prevent dissolved nutrient availability from being a strong driver of microbial nutrient cycling.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationCheever, Beth M.; Kratzer, Erika B.; Webster, Jackson R. 2012. Immobilization and mineralization of N and P by heterotrophic microbes during leaf decomposition. Freshwater Science. 31(1): 133-147. 15 p.
Keywordsnutrient uptake, nutrient mineralization, leaf breakdown, hterotrophic microbes, nutrient availability, streams
- Nutrients stimulate leaf breakdown rates and detritivore biomass: bottom-up effects via heterotrophic pathways.
- Influence of shredder feeding and nutrients on fungal activity and community structure in headwater streams
- Nitrogen cycling responses to simulated emerald ash borer infestation in Fraxinus nigra-dominated wetlands
XML: View XML