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Sugar maple leaf characteristics
vary with depth in the crown and
nutrient addition
Alex Young, Rakesh Minocha, Ruth Yanai
Does it matter where you get
your leaf samples?
Leaves are amazing.
Most leaves are shaded.
“sun” leaves
“shade” leaves
12 sugar maples
3 mature stands
~5 branches per tree
Physical characteristics
● Leaf area, leaf mass, twig length, twig mass
Chemical characteristics
● N, P, Ca, Mg, Al, Mn, B
Metabolic characteristics
● Chlorophyll: A, B, carotenoids
● Amino acids: GABA, Glu, Arg, Ala, Val
● Polyamines: Putrescine, Spermidine, Spermine
Crown depth
N response
P response
Foliar N increased with depth, and with N addition
Per unit mass Per unit area
Foliar P increased with P addition
Per unit mass Per unit area
Chlorophyll was higher throughout crown with N
Per unit mass Per unit area
Take-away messages
The majority of the leaves in the world are shaded,
Not just “sun” and “shade” leaves, but gradient
N is important for leaves
Examining the vertical gradient can help reveal novel relationships
Acknowledgements
•P.I.’s Ruth Yanai, Melany Fisk, Tim
Fahey
•Drs. Rakesh Minocha, Stephanie Long
•Drs. John Drake, Danilo Fernando
•Yanai B9 Forest ecology lab
•Summer 2017 and 2018 crew
•NSF-REU “Canopy Herbivory and
Tardigrades”
Sugar maple leaf characteristics vary with depth in the crown and nutrient addition   alex young

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Sugar maple leaf characteristics vary with depth in the crown and nutrient addition alex young

  • 1. Sugar maple leaf characteristics vary with depth in the crown and nutrient addition Alex Young, Rakesh Minocha, Ruth Yanai
  • 2. Does it matter where you get your leaf samples?
  • 3. Leaves are amazing. Most leaves are shaded. “sun” leaves “shade” leaves
  • 4. 12 sugar maples 3 mature stands ~5 branches per tree
  • 5. Physical characteristics ● Leaf area, leaf mass, twig length, twig mass Chemical characteristics ● N, P, Ca, Mg, Al, Mn, B Metabolic characteristics ● Chlorophyll: A, B, carotenoids ● Amino acids: GABA, Glu, Arg, Ala, Val ● Polyamines: Putrescine, Spermidine, Spermine Crown depth N response P response
  • 6. Foliar N increased with depth, and with N addition Per unit mass Per unit area
  • 7. Foliar P increased with P addition Per unit mass Per unit area
  • 8. Chlorophyll was higher throughout crown with N Per unit mass Per unit area
  • 9. Take-away messages The majority of the leaves in the world are shaded, Not just “sun” and “shade” leaves, but gradient N is important for leaves Examining the vertical gradient can help reveal novel relationships Acknowledgements •P.I.’s Ruth Yanai, Melany Fisk, Tim Fahey •Drs. Rakesh Minocha, Stephanie Long •Drs. John Drake, Danilo Fernando •Yanai B9 Forest ecology lab •Summer 2017 and 2018 crew •NSF-REU “Canopy Herbivory and Tardigrades”

Editor's Notes

  1. Light dependent acclimation of photosynthetic capacity per area is surprisingly similar across PFTs, the underlying traits enabling acllimation differ. For example, species with high leaf turnover and canopy development with highly dynamic light environments can adjust photosynthetic capacity by reallocating N among leaves. In contrast, plants that have low leaf turnover are predominately constrainted by leaf structure which stabilizes after 30-60 days after leaf out. Niinements et al 2014 New Phytologist.
  2. Light dependent acclimation of photosynthetic capacity per area is surprisingly similar across PFTs, the underlying traits enabling acllimation differ. For example, species with high leaf turnover and canopy development with highly dynamic light environments can adjust photosynthetic capacity by reallocating N among leaves. In contrast, plants that have low leaf turnover are predominately constrainted by leaf structure which stabilizes after 30-60 days after leaf out. Niinements et al 2014 New Phytologist.