2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2018 | 10:15 AM - 10:30 AM | LEAF DISK RESPIRATION AND ALKALINE PHOSPHATASE ACTIVITY MEASURED ACROSS A DISSOLVED INORGANIC PHOSPHORUS GRADIENT IN THE LABORATORY | 321
LEAF DISK RESPIRATION AND ALKALINE PHOSPHATASE ACTIVITY MEASURED ACROSS A DISSOLVED INORGANIC PHOSPHORUS GRADIENT IN THE LABORATORY
The strong statistical relationships between stream nutrient concentrations and litter decomposition and stoichiometry suggest they could be good detrital indicators of nutrient limitation and enrichment. Litter alkaline phosphatase activity (APA) and respiration may also be good indicators that could be measured more economically. We conducted a 210-d laboratory experiment to 1) examine the effects of time, litter type, and dissolved inorganic phosphorus (DIP)-enrichment on respiration rates and APA and to 2) determine whether these short-term measures were related to litter stoichiometry and decomposition rates. The APA did not depend on litter type, but did decline with increasing DIP on some sample days. Although time, litter type, and DIP all interacted to affect respiration few consistent trends were found beyond greater rates on maple compared to oak. Litter C:P declined predictably with DIP and was related to decomposition indicating P-limitation, but APA was only sometimes positively correlated with litter C:P. Therefore, litter APA was not a consistent indicator of P-limitation of decomposition. Decomposition and respiration rates were positively correlated for both litter types, but the amount of variation explained was relatively low suggesting additional work establishing this possible indicator is needed.
- Nutrients
- Bacteria
- Stoichiometry
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Presenters/Authors
Michelle Evans-White
(), University of Arkansas, mevanswh@uark.edu;
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Ayla Smartt
(), University of Arkansas, asmartt@uark.edu;
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Sally Entrekin
(), Virginia Tech, sallye@vt.edu;
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Halvor Halvorson
(), University of Central Arkansas, hhalvorson@uca.edu;
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Thad Scott
(), Baylor University, Thad_Scott@baylor.edu ;
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