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Thomas Mann, Kate Bazany, and Ruth Yanai
Baby boomers: Are there any surviving
germinants from the recent mast year?
2017 was a mast year
Fagus grandifolia Acer saccharum
How do nutrient treatments affect
germination rates and seedling survival?
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
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).
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
Germination rates
Seedling survival
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!

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

  • 1. Thomas Mann, Kate Bazany, and Ruth Yanai Baby boomers: Are there any surviving germinants from the recent mast year?
  • 2. 2017 was a mast year Fagus grandifolia Acer saccharum
  • 3. How do nutrient treatments affect germination rates and seedling survival?
  • 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. 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. 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
  • 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

  1. 2011 mast year (2012 germs) vs 2013 germs 2018 germs vs 2019 germs Do the outcomes seen in 2012v2013 predict 2018v2019?
  2. Literature: Cleavitt Implications of nutrient excess for soil chemical properties
  3. P-value for first bullet point? Variation across stands supports findings that microtopography affects germinant survival. Was worse survival due to herbivory?