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Mycorrhizal dynamics under elevated CO2 and nitrogen fertilization in a warm temperate forest

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Abstract

We examined the response of mycorrhizal fungi to free-air CO2 enrichment (FACE) and nitrogen (N) fertilization in a warm temperate forest to better understand potential influences over plant nutrient uptake and soil carbon (C) storage. In particular, we hypothesized that mycorrhizal fungi and glomalin would become more prevalent under elevated CO2 but decrease under N fertilization. In addition, we predicted that N fertilization would mitigate any positive effects of elevated CO2 on mycorrhizal abundance. Overall, we observed a 14% increase in ectomycorrhizal (ECM) root colonization under CO2 enrichment, which implies that elevated CO2 results in greater C investments in these fungi. Arbuscular mycorrhizal (AM) hyphal length and glomalin stocks did not respond substantially to CO2 enrichment, and effects of CO2 on AM root colonization varied by date. Nitrogen effects on AM fungi were not consistent with our hypothesis, as we found an increase in AM colonization under N fertilization. Lastly, neither glomalin concentrations nor ECM colonization responded significantly to N fertilization or to an N-by-CO2 interaction. A longer duration of N fertilization may be required to detect effects on these parameters.

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Acknowledgements

We thank A. Finzi, S. Allison, R. Oren, S. Pritchard, Y. Erlitz, A. Majumder, and T. Poy for intellectual contributions and technical assistance. We are grateful to Duke University for access to the field sites. This work was supported by the Department of Energy (DE-FG02-95ER62083).

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  1. Department of Ecology and Evolutionary Biology, University of California, Irvine, CA, 92697, USA

    Maria O. Garcia, Tatevik Ovasapyan, Mary Greas & Kathleen K. Treseder

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  1. Maria O. Garcia
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  2. Tatevik Ovasapyan
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  3. Mary Greas
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  4. Kathleen K. Treseder
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Correspondence to Maria O. Garcia.

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Garcia, M.O., Ovasapyan, T., Greas, M. et al. Mycorrhizal dynamics under elevated CO2 and nitrogen fertilization in a warm temperate forest. Plant Soil 303, 301–310 (2008). https://doi.org/10.1007/s11104-007-9509-9

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