2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/22/2019 | 9:00 AM - 9:15 AM | A GLOBAL STUDY OF NUTRIENT CONTROLS ON ORGANIC MATTER PROCESSING | 253 AB
A GLOBAL STUDY OF NUTRIENT CONTROLS ON ORGANIC MATTER PROCESSING
Organic matter entering streams as senesced plant litter is often of poor nutritional quality, and microbes must assimilate nutrients from the environment to build biomass and use this carbon resource. Large-scale studies of the role of external nutrients on litter decomposition are often confounded by variation in litter chemistry. We deployed cotton strips, a nutrient-poor substrate (C:N = 240, C:P = 4100) consisting almost entirely of cellulose, in more than 500 streams and riparian zones to estimate decomposition rates and related those process rates to nutrient accumulation. Cotton placed in riparian zones rarely assimilated nutrients, and C:N and C:P ratios increased during decomposition. Nutrient content of cotton was a poor predictor of decomposition rates, likely due to the overriding influence of moisture limitation on terrestrial decomposition. However, cotton placed in streams accumulated substantial N and P, which lowered C:N and C:P. Microbially colonized cotton C:N strongly predicted decomposition rates (r2 = 0.78), with the fastest decomposing cotton have C:N <60. These results supports the idea that riparian carbon processing is not nutrient-limited, but in-stream organic matter processing is strongly controlled by available nutrients (especially N).
- Stoichiometry
- Nutrients
- Riparian
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Presenters/Authors
David Costello
(), Kent State University, dcostel3@kent.edu;
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Devan Mathie
(), Kent State University, dmathie20@gmail.com;
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Scott Tiegs
(), Dept. of Biological Sciences, Oakland University, tiegs@oakland.edu;
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