2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/25/2021 | 8:30 AM - 10:30 AM | Land-Use Effects on Decomposition Rates and Immobilization of Nutrients in Urban Streams | Virtual Platform

Land-Use Effects on Decomposition Rates and Immobilization of Nutrients in Urban Streams

Stream ecosystems provide key ecosystem services, but with increasing development, urban streams are at risk for nutrient pollution which can impact services. A cotton-strip assay was used to measure decomposition rate and nutrient uptake by decomposing microbes (i.e., immobilization) within 19 streams across the Chatahoochee and Ocmulgee River Basins in Metropolitan Atlanta, Georgia (USA). Decomposition rates were strongly correlated to phosphorus immobilization rates suggesting that nutrient supply influenced carbon cycling. Using GIS and satellite imagery, we analyzed land use patterns to identify potential sources of phosphorus. Overall impervious cover was positively correlated with decomposition and phosphorus immobilization, but much stronger relationships were observed with low intensity residential land areas . This suggests that increased rates of decomposition and immobilization could be due to lawn fertilizer application or an aging, obsolete water infrastructure, which are hypotheses for future study. Our study shows strong linkages between nutrient and carbon cycles in urban streams and suggests that elevated nutrient supply may impact carbon storage.

Decomposition
Land use
Nutrient cycling

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Presenters/Authors

Anthony Pignatelli (), Kent State University, apignat2@kent.edu;