Phenology of leaf senescence:it's LIT(ter)

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melnhe

2017 Hubbard Brook presentation

Science

Leaf Retention Findings • N treated trees dropped
significantly more leaves than
N+P plot (p < 0.001).
• Maple leaf retention showed
no significant response to
treatment (p = 0.60). 3
Birch Leaf Retention
Maple Leaf Retention

Hypotheses
• Fertilized trees will drop more leaf mass later in the autumn
compared to the unfertilized trees.
• Old stand trees will drop more leaf mass later in the autumn than
younger stand trees.
4Adam Wild

Methods
• Four collection periods:
• October 8th
• Oct. 17th - 18th
• Oct. 22nd – 24th
• November 5th – 6th
Litter being sorted before
being dried and weighed
Systematic basket
placement in each plot 5
Gretchen Lasser
Madison Morley
Litter collection

$Data Analysis • Cumulative fraction 6 1 𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛 𝑇𝑜𝑡𝑎𝑙 𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛𝑠 1 + 2 𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛𝑠 𝑇𝑜𝑡𝑎𝑙 𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛𝑠 1 + 2 + 3 𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛𝑠 𝑇𝑜𝑡𝑎𝑙 𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛𝑠 1 + 2 + 3 + 4 𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛𝑠 𝑇𝑜𝑡𝑎𝑙 𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛𝑠Madison Morley$

Results
Young
Mid-
aged
Old
7
Collection 1 (Oct. 8th)
- Young stand trees have
dropped more leaf litter
(p = 0.05).
- N treated trees have
retained more leaves
(p = 0.06).
Collection 2
(Oct. 17th-18th)
- N treated trees have
retained more leaves
(p = 0.01).
- P treated trees have
retained more leaves
(p = 0.07).
Collection 3
(Oct. 22nd-24th)
-N treated trees have
retained more leaves
(p = 0.02).
Collection (number)

Conclusions
• Nutrients (especially N) delay autumn leaf abscission in trees.
• The availability of nutrients promote a longer growing season.
• Trees in older stands retain their leaves longer than those in young-
age stands.
• Stands that vary in age have different species compositions and species have
unique timing of leaf fall.
• Remember Snapchat for Science!
8
• Sort the litter in some of the stands by species
• Add spring 2017 litter to our collection periods
Next steps

Acknowledgments
• Dr. Ruth Yanai
• Adam Wild
• Yanai’s B9 Lab Family
• Shan Shan
• Dr. Yanai’s High School Team
• 2017 MELNHE Field Crew!!!
9
Yang Yang
Alex Young
Gretchen LasserMadison Morley

Questions?
10
Mt. Washington!!!
…Cool!
Madison Morley

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Phenology of leaf senescence:it's LIT(ter)

1. Phenology of Leaf Senescence: it’s LIT(ter)🔥! Maddy Morley SUNY College of Environmental Science and Forestry Griffin Walsh Yale University Mentor: Dr. Ruth Yanai SUNY College of Environmental Science and Forestry 1 Adam Wild

2. Introduction • Trees time their senescence to maximize their growing season while reabsorbing nutrients before frost. • Snapchat for Science: Comparing Leaf Retention on Nitrogen and Phosphorus-Fertilized Birch and Maple Trees Low Rank High RankTaking birch and maple canopy photos 2 Madison Morley

3. Leaf Retention Findings • N treated trees dropped significantly more leaves than N+P plot (p < 0.001). • Maple leaf retention showed no significant response to treatment (p = 0.60). 3 Birch Leaf Retention Maple Leaf Retention

4. Hypotheses • Fertilized trees will drop more leaf mass later in the autumn compared to the unfertilized trees. • Old stand trees will drop more leaf mass later in the autumn than younger stand trees. 4Adam Wild

5. Methods • Four collection periods: • October 8th • Oct. 17th - 18th • Oct. 22nd – 24th • November 5th – 6th Litter being sorted before being dried and weighed Systematic basket placement in each plot 5 Gretchen Lasser Madison Morley Litter collection

6. Data Analysis • Cumulative fraction 6 1 𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛 𝑇𝑜𝑡𝑎𝑙 𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛𝑠 1 + 2 𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛𝑠 𝑇𝑜𝑡𝑎𝑙 𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛𝑠 1 + 2 + 3 𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛𝑠 𝑇𝑜𝑡𝑎𝑙 𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛𝑠 1 + 2 + 3 + 4 𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛𝑠 𝑇𝑜𝑡𝑎𝑙 𝑐𝑜𝑙𝑙𝑒𝑐𝑡𝑖𝑜𝑛𝑠Madison Morley

7. Results Young Mid- aged Old 7 Collection 1 (Oct. 8th) - Young stand trees have dropped more leaf litter (p = 0.05). - N treated trees have retained more leaves (p = 0.06). Collection 2 (Oct. 17th-18th) - N treated trees have retained more leaves (p = 0.01). - P treated trees have retained more leaves (p = 0.07). Collection 3 (Oct. 22nd-24th) -N treated trees have retained more leaves (p = 0.02). Collection (number)

8. Conclusions • Nutrients (especially N) delay autumn leaf abscission in trees. • The availability of nutrients promote a longer growing season. • Trees in older stands retain their leaves longer than those in young- age stands. • Stands that vary in age have different species compositions and species have unique timing of leaf fall. • Remember Snapchat for Science! 8 • Sort the litter in some of the stands by species • Add spring 2017 litter to our collection periods Next steps

9. Acknowledgments • Dr. Ruth Yanai • Adam Wild • Yanai’s B9 Lab Family • Shan Shan • Dr. Yanai’s High School Team • 2017 MELNHE Field Crew!!! 9 Yang Yang Alex Young Gretchen LasserMadison Morley

10. Questions? 10 Mt. Washington!!! …Cool! Madison Morley

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