EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/23/2019 | 10:00 AM - 10:15 AM | THE EFFECTS OF NUTRIENT AND LABILE CARBON ADDITIONS ON THE PRIMING OF LEAF LITTER DECOMPOSITION BY POND SEDIMENTS | 254 B
THE EFFECTS OF NUTRIENT AND LABILE CARBON ADDITIONS ON THE PRIMING OF LEAF LITTER DECOMPOSITION BY POND SEDIMENTS
Pond construction is a common anthropogenic modification to watersheds that is likely to alter organic matter processing. Our previous research has found that small ponds in central Virginia accumulate a large standing stock of terrestrial leaf litter (mean = 162 g AFDM m-2) that decomposes slowly (mean k = -0.0030 d-1). We have also found that leaf litter decomposition (measured as a change in toughness) is 42% faster when the litter is in contact with the pond sediments, indicating that the pond environment alters organic matter processing. In this experiment, we used microcosms to test the hypothesis that the accelerated leaf decomposition in the sediments was due to increased availability of inorganic N and P, and/or labile carbon in the sediment environment. Our results show that glucose additions did not alter decomposition rate (measured as the change in leaf toughness) but leaf decomposition rate was altered by N and P additions after 2 and 14 weeks of incubation. These results suggest that nutrient limitation more than labile carbon limitation affects the decomposition of terrestrial organic matter in the sediments of small ponds.
- Lentic
- Organic Matter
- Biogeochemistry
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Presenters/Authors
Alyssa Oppedisano
(), Longwood University, alyssa.oppedisano@live.longwood.edu;
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Gabrielle Huerta
(), Longwood University, gabrielle.huerta@live.longwood.edu;
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Kenneth Fortino
(), Longwood University, fortinok@longwood.edu;
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Matthew Waters
(), Auburn University, mwaters@auburn.edu;
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