2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/25/2021 | 2:00 PM - 3:30 PM | GLOBAL-SCALE CONTROLS OF NUTRIENT IMMOBILIZATION IN STREAMS AND RIPARIAN ZONES | Virtual Platform
GLOBAL-SCALE CONTROLS OF NUTRIENT IMMOBILIZATION IN STREAMS AND RIPARIAN ZONES
Microbial litter decomposers obtain nitrogen (N) and phosphorus (P) from both the litter itself and the surrounding stream water or soil solution. This complicates the quantification of N and P immobilization during decomposition. We used cotton strips as a low nutrient substrate to investigate exogenous controls of nutrient immobilization. We deployed cotton strips in streams and on adjacent riparian soils during peak litterfall at 100 sites representing 11 biomes, and measured residual carbon, N, and P content to calculate nutrient immobilization. Overall, immobilization varied by 3 orders of magnitude and was higher in streams than riparian zones. Immobilization rates were correlated to site-specific conditions such as streamwater nutrient concentration, but were not strongly related to biome or latitude. Although the molar N:P ratio of surface water varied widely, the stoichiometry of immobilized N:P (10) was tightly constrained near the global mean N:P ratio of microbial biomass (7:1). Litter decomposition rate was correlated to nutrient immobilization, with the strongest relationship between decomposition rate and P immobilization. An estimate based on biome-specific data on litterfall suggests that immobilization could account for a substantial amount of whole-stream nutrient uptake during peak litterfall.
- Nutrients
- Organic matter
- Ecosystem functioning
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Presenters/Authors
David Costello
(), Kent State University, dcostel3@kent.edu;
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Scott Tiegs
(), Dept. of Biological Sciences, Oakland University, tiegs@oakland.edu;
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Luz Boyero
(), University of the Basque Country, luz.boyero@ehu.eus;
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Cristina Canhoto
(), Centre for Functional Ecology, University of Coimbra, Portugal, ccanhoto@ci.uc.pt;
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Krista Capps
(), University of Georgia, kcapps@uga.edu;
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Michaël Danger
(), LIEC, Univ. Lorraine, France, michael.danger@univ-lorraine.fr;
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Paul C. Frost
(), Trent University, Peterborough, Ontario, Canada, paulfrost@trentu.ca;
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Mark Gessner
(), Leibniz-Institute of Freshwater Ecology and Inland Fisheries / Berlin Institute of Technology , gessner@igb-berlin.de;
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Natalie A. Griffiths
(), Oak Ridge National Laboratory, griffithsna@ornl.gov;
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Halvor Halvorson
(), University of Central Arkansas, hhalvorson@uca.edu;
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Kevin Kuehn
(), The University of Southern Mississippi, kevin.kuehn@usm.edu;
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Amy Marcarelli
(), Michigan Technological University, ammarcar@mtu.edu;
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Devan Mathie
(), Kent State University, dmathie20@gmail.com;
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Todd V. Royer
(), Indiana University Bloomington, troyer@indiana.edu;
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