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Uptake of organic nitrogen by coastal wetland plants under elevated CO2

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Abstract

Aims

This study was conducted to answer the question of whether elevated CO2 and the presence or absence of inorganic nitrogen (NH4+) affect the uptake of different forms of organic nitrogen in two dominant saltmarsh species Schoenoplectus americanus and Spartina patens.

Methods

S. americanus and S. patens were grown under elevated and ambient CO2 conditions and a series of hydroponic assays were conducted using dual labelled 13C15N– glycine, glutamic acid and urea supplied in both the absence and presence of NH4+.

Results

Results show rates of glycine and urea uptake were lower under elevated CO2 conditions for both species. Ratios of 13C and 15N in S. patens roots showed that at least 68 and 79% of glycine under ambient and elevated CO2, respectively, was taken up intact. Provision of NH4+ with organic N caused organic N uptake rates to decline by up to 75% in S. americanus and up to 50% in S. patens compared with plants that only received organic N.

Conclusions

The reduction in organic N uptake in the presence of NH4+ suggests that plants rely primarily on mineral N in the field. In addition, we can deduce that organic N uptake is not likely to supply plants with the additional N required under elevated CO2, and that the repressive effects of elevated CO2 on organic N uptake may have negative consequences for ecosystem productivity and carbon sequestration.

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Acknowledgements

Authors would like to thank Emily Geoghegan for assistance with experimental work and Gary Peresta, Andrew Peresta and Jim Duls for technical assistance. GMC was funded by the Irish Research Council and the Marie Skłodowska-Curie Actions Programme under the ELEVATE (ELEVATEPD/2014/68) career development research fellowship. This work was also supported by the Department of Energy Terrestrial Ecosystem Science Program (DE-SC0008339), the National Science Foundation Long-Term Research in Environmental Biology Program (DEB-0950080, DEB-1457100, DEB-1557009), and the Smithsonian Institution.

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  1. Grace M. Cott

    Present address: School of Biology and Environmental Science, University College Dublin, Belfield, Dublin 4, Ireland

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  1. School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, Cork, Ireland

    Grace M. Cott & Marcel A. K. Jansen

  2. Environmental Research Institute, University College Cork Lee Road, Cork, Ireland

    Grace M. Cott & Marcel A. K. Jansen

  3. Smithsonian Environmental Research Center, 647 Contees Wharf Road, Edgewater, MD, 21037, US

    Grace M. Cott & J. Patrick Megonigal

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Cott, G.M., Jansen, M.A.K. & Megonigal, J.P. Uptake of organic nitrogen by coastal wetland plants under elevated CO2. Plant Soil 450, 521–535 (2020). https://doi.org/10.1007/s11104-020-04504-5

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