2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/05/2017 | 9:00 AM - 9:15 AM | EFFECTS OF PHOSPHORUS AND LIGHT ON RECALCITRANT ORGANIC MATTER DEGRADATION IN LOTIC SYSTEMS | 306A
EFFECTS OF PHOSPHORUS AND LIGHT ON RECALCITRANT ORGANIC MATTER DEGRADATION IN LOTIC SYSTEMS
Light may increase algal growth and labile organic matter (LOM) production that can stimulate recalcitrant organic matter (ROM) decomposition. This priming effect (PE) may be more important under low nutrient concentrations. We tested whether phosphorus (P) concentrations (10, 100, 500 ?g P/L) and light [full (100%) or shade (19% of full light)] interact to affect ROM decomposition suggesting the PE, which is the difference between full light and shaded treatments, is greater at low nutrient concentrations using experimental recirculating mesocosms. Time and light interacted significantly to drive suspended algal biomass increases (p=0.009) and P was not statistically significant. Time, light, and P interacted significantly to drive periphyton increases (p=0.038). Under low to moderate nutrients there was positive PE, but under high nutrients negative PE was observed. Light and P interacted significantly to decrease leaf litter fiber mass (p=0.003), increase fiber % (p=<0.001), decrease lignin-specific mass in low to moderate nutrients and increase in high nutrients (p=0.002), and increase lignin-specific % (p=<0.001). Our research supports the hypothesis that magnitude and direction of PE depends on dissolved nutrient availability in aquatic ecosystems.
- C27 Landuse and Non-Point source Impacts
- C04 Microbial Ecology
- C31 Organic Matter Processing
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Presenters/Authors
Brooke Howard-Parker
(), University of Arkansas, bbhowardparker@gmail.com;
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Michelle Evans-White
(), University of Arkansas, mevanswh@uark.edu;
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Brendon White
(), University of Arkansas, blw023@email.uark.edu;
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