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Baby boomers are there any surviving germinants from the recent mast year - thomas mann

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Baby boomers are there any surviving germinants from the recent mast year - thomas mann

  1. 1. Thomas Mann, Kate Bazany, and Ruth Yanai Baby boomers: Are there any surviving germinants from the recent mast year?
  2. 2. 2017 was a mast year Fagus grandifolia Acer saccharum
  3. 3. How do nutrient treatments affect germination rates and seedling survival?
  4. 4. How do nutrient treatments affect germination rates and seedling survival? - Sugar maple - Decline of mature trees - Positive correlation between soil Ca and sugar maple germinant survival Juice et al. 2006
  5. 5. Hypotheses 1. Germination rates and survival of maple seedlings will be highest in Ca-treated plots, presuming Ca limitation of sugar maple. 1. Germination rates and survival of beech seedlings will reflect nutrient limitation of beech (could be N or P). 1. Alternatively, survival may reflect the nutritional value of the seedlings (lowest with nutrient addition).
  6. 6. Methods - Ten 1-m2 subplots in each treatment plot of mature stands - Summer 2018: 3 rounds of American beech and sugar maple germinant counts - Summer 2019: 1 round so far counting seedlings of that cohort
  7. 7. Germination rates
  8. 8. Seedling survival
  9. 9. How do nutrient treatments affect germination rates and seedling survival? Germination rates - Beech benefitted from N and P addition (more germinants/tree) - Maple produced fewer germinants under N and P addition Seedling survival - Survival was worse under N and P addition - Ca addition was good for survival Nutrients are important but N and P didn’t differ in effect!

Editor's Notes

  • 2011 mast year (2012 germs) vs 2013 germs
    2018 germs vs 2019 germs

    Do the outcomes seen in 2012v2013 predict 2018v2019?
  • Literature: Cleavitt
    Implications of nutrient excess for soil chemical properties
  • P-value for first bullet point?
    Variation across stands supports findings that microtopography affects germinant survival.

    Was worse survival due to herbivory?

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