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Mycorrhizal type and co-limitation of forest productivity. Noah Blumenthal

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Mycorrhizal type and co-limitation of forest productivity. Noah Blumenthal

  1. 1. Mycorrhizal Type and Co- Limitation of Forest Productivity Noah Blumenthal et al. Miami University
  2. 2. Mycorrhizae • Two types of mycorrhizal associations: Arbuscular Mycorrhizal (AM) or Ectomycorrhizal (EM) • Plants form one of the two (e.g. Maples, Ash = AM; Beech, Birch = EM) • Linked to different rates of nutrient cycling and uptake (Phillips et al 2013)
  3. 3. Question • Productivity should be co-limited by N and P (e.g. Elser et al 2007, Harpole et al 2011) • Between 2011 and 2015, there was a growth response to P but not a greater response to NP in MELNHE (Goswami et al 2018) • Do nutrient limitations associated with different mycorrhizal types contribute to co-limitation? • Hypothesis: Co-limitation in northern hardwoods arises from differential N and P limitation by mycorrhizal types
  4. 4. Methods • Annual stem growth was measured between 2015 and 2019 • Each species designated as AM or EM • Ran linear mixed-effects model in R’s nlme package, treating N, P, and mycorrhizal type as fixed effects • Analyzed stand ages separately, when found to be significant (F = 11.10, P = 0.005) in an overall model Species Mycorrhizae Abies balsamea - Balsam Fir EM Acer pensylvanicum - Striped Maple AM Acer rubrum - Red Maple AM Acer saccharum - Sugar Maple AM Betula alleghaniensis - Yellow Birch EM Betula papyrifera - White Birch EM Fagus grandifolia - American Beech EM Fraxinus americana - White Ash AM Picea rubens - Red Spruce EM Populus grandidentata - Bigtooth Aspen EM Populus tremuloides - Quaking Aspen EM Prunus pensylvanica - Pin Cherry AM Prunus serotina - Black Cherry AM Quercus rubra - Northern Red Oak EM Sorbus americana - Mountain Ash AM Tilia americana - Basswood EM Tsuga canadensis - Eastern Hemlock EM
  5. 5. Response of productivity in mature stands to N and P additions based on mycorrhizal type. Significant results are in bold. Predictor Degrees of Freedom F P N 1,28 2.83 0.104 P 1,28 3.60 0.068 Mycorrhizal Type 1,28 3.53 0.071 N x P 1,28 6.71 0.015 N x M Type 1,28 2.58 0.120 P x M Type 1,28 1.36 0.254 N x P x M Type 1,28 4.50 0.043
  6. 6. Conclusions • The NxP interaction suggests co-limitation of mature forest productivity • This interaction is more strongly observed in AM trees than EM trees • Greater relative abundance of AM promotes co-limitation
  7. 7. Literature Cited • Elser, J. J., M. E. S. Bracken, E. E. Cleland, D. S. Gruner, W. S. Harpole, H. Hillebrand, J. T. Mgai, E. W. Seabloom, J. B. Shurin, and J. E. Smith. 2007. Global analysis of nitrogen and phosphorus limitation of primary producers in freshwater, marine and terrestrial ecosystems. Ecology Letters 10:1135–1142. • Goswami, S., M. C. Fisk, M. A. Vadeboncoeur, M. Garrison-Johnston, R. D. Yanai, and T. J. Fahey. 2018. Phosphorus limitation of aboveground production in northern hardwood forests. Ecology 99:438–449. • Harpole, W. S., J. T. Ngai, E. E. Cleland, E. W. Seabloom, E. T. Borer, M. E. S. Bracken, J. J. Elser, D. S. Gruner, H. Hillebrand, J. B. Shurin, and J. E. Smith. 2011. Nutrient co-limitation of primary producer communities. Ecology Letters 14:852–862. • Phillips, R. P., E. Brzostek, and M. G. Midgley. 2013. The mycorrhizal- associated nutrient economy: A new framework for predicting carbon- nutrient couplings in temperate forests. New Phytologist 199:41–51.
  8. 8. Acknowledgements The MELNHE Project is funded by USDA NIFA (2019-67019-29464) and NSF (DEB-1637685) . For more information, please visit www.esf.edu/melnhe

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