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Nitrogen uptake kinetics and saltmarsh plant responses to global change

Cott, Grace M.
; ; 
Mozdzer, Thomas J.
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Journal article
Date
2018-03-29
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Landscape Architecture and Horticulture
Subject
Climate-change ecology
 Ecophysiology
 Plant physiology
 Wetlands ecology
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https://scholarshare.temple.edu/handle/20.500.12613/11481
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https://doi.org/10.1038/s41598-018-23349-8
Abstract
Coastal wetlands are important carbon sinks globally, but their ability to store carbon hinges on their nitrogen (N) supply and N uptake dynamics of dominant plant species. In terrestrial ecosystems, uptake of nitrate (NO3−) and ammonium (NH4+) through roots can strongly influence N acquisition rates and their responses to environmental factors such as rising atmospheric CO2 and eutrophication. We examined the 15N uptake kinetics of three dominant plant species in North American coastal wetlands (Spartina patens, C4 grass; Phragmites australis, C3 grass; Schoenoplectus americanus, C3 sedge) under ambient and elevated CO2 conditions. We further related our results to the productivity response of these species in two long-term field experiments. S. patens had the greatest uptake rates for NO3− and NH4+ under ambient conditions, suggesting that N uptake kinetics may underlie its strong productivity response to N in the field. Elevated CO2 increased NH4+ and NO3− uptake rates for S. patens, but had negative effects on NO3− uptake rates in P. australis and no effects on S. americanus. We suggest that N uptake kinetics may explain differences in plant community composition in coastal wetlands and that CO2-induced shifts, in combination with N proliferation, could alter ecosystem-scale productivity patterns of saltmarshes globally.
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Cott, G.M., Caplan, J.S. & Mozdzer, T.J. 2018. Nitrogen uptake kinetics and saltmarsh plant responses to global change. Sci Rep, 8, 5393. https://doi.org/10.1038/s41598-018-23349-8.
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Nature Research
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Scientific Reports, 8, 5393
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