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Mycorrhizal fungi can mediate ecosystem responses to global change

Mycorrhizal fungi can mediate ecosystem responses to global change. Kathleen Treseder & Matthew Whiteside University of California Irvine. Fungal feedbacks on global change. Arbuscular mycorrhizal fungi. 1 mm. 1 mm. Arbuscular mycorrhizal fungi. Carbon. 1 mm. 1 mm.

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Mycorrhizal fungi can mediate ecosystem responses to global change

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  1. Mycorrhizal fungi can mediate ecosystem responses to global change Kathleen Treseder & Matthew Whiteside University of California Irvine

  2. Fungal feedbacks on global change

  3. Arbuscularmycorrhizal fungi 1 mm 1 mm

  4. Arbuscularmycorrhizal fungi Carbon 1 mm 1 mm

  5. Arbuscularmycorrhizal fungi Nutrients 1 mm 1 mm

  6. Arbuscularmycorrhizal fungi Nutrients 1 mm Paradigm: Do not absorb organic nutrients 1 mm

  7. Meta-analysis: Mycorrhizal fungi respond to global change +47% –15% –32% Elevated CO2 Treseder 2004, New Phytol.

  8. – –? –? Hypothesis

  9. Nitrogen fertilization in boreal forest Control N: 100 kg NH4NO3-N ha-1 y-1

  10. Quantum dots track organic N use by fungi <1–100 nm Matthew Whiteside

  11. Penicillium +2 hours +6 hours +24 hours Whiteside et al. 2009, Ecology

  12. Controls +24 hours Whiteside et al. 2009, Ecology

  13. Arbuscular mycorrhizal hyphae absorb glycine-N Arbuscular mycorrhizal hyphae Root tissue Leaf tissue +4 hours Whiteside et al. 2009, Ecology

  14. Chitosan: A more recalcitrant molecule QD QD QD

  15. AM fungi and chitosan chitosan +5 hours Whiteside et al. 2009, Ecology

  16. Quantum dot cocktail Glycine Chitosan QD QD QD G C

  17. Field incubations C G

  18. Quantification of uptake Raster image correlation spectroscopy

  19. AM fungi acquired labile and recalcitrant organic N * Whiteside et al. 2012, Soil Biol. Biochem.

  20. Summary – – – – –?

  21. Acknowledgements • Steve Allison • Krista McGuire • Jenny Talbot • Matthew Whiteside • James Borneman • Michelle Digman • Liz Bent • EnricoGratton • Peter Atsatt • Maria Garcia • NSF Ecosystems • NSF Geosciences • Dept of Energy • Kearney Foundation • NOAA • Mellon Foundation • UCI Environment Institute

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