2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 2:00 PM - 3:30 PM | LAND USE EFFECTS ON NUTRIENT LIMITATION AND PRIMING EFFECTS IN AN ARKANSAS WATERSHED | Virtual Platform
LAND USE EFFECTS ON NUTRIENT LIMITATION AND PRIMING EFFECTS IN AN ARKANSAS WATERSHED
Land conversion from forest to agriculture introduces nutrients, like nitrogen (N) and phosphorus (P), which can stimulate microbial autotrophs (algae) and heterotrophs (fungi and bacteria). Recent evidence indicates that algae can stimulate microbial decomposers associated with decaying plant litter, thus eliciting a “priming effect” on organic matter decomposition. We used a full-factorial design manipulating labile C (glucose and acetate) and nutrients (N and P) to test their effects during the red maple litter decomposition within 4 forested and 4 agricultural streams. We deployed nutrient-diffusing substrates (NDS) containing litter and either agar, agar+labile C, agar+NP, or agar+CNP. Land use mediated NDS treatment effects on algal biomass (p<0.001) with the NP treatment having no difference between land uses, but both C and CNP treatments inhibited algae in forested streams. Fungal biomass in forested streams trended higher than agriculture streams (p=0.052), and there were significant NDS effects (p<0.001), with the C treatment having the highest fungal biomass whereas nutrients (NP and CNP) inhibited fungi. We will also report bacterial biomass, litter metabolism, and decomposition rates to better understand the role of the priming effect and nutrient limitation in stream C cycling.
- Decomposition
- Nutrient cycling
- Carbon cycle
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Presenters/Authors
Tori Hebert
(), University of Central Arkansas, torihebert6@gmail.com;
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Kevin Kuehn
(), The University of Southern Mississippi, kevin.kuehn@usm.edu;
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Halvor Halvorson
(), University of Central Arkansas, hhalvorson@uca.edu;
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