Photosynthetic Comparison of Ginkgos and Ulmus Mortons


It is hypothesized Ulmus Mortons will be more photosynthetically efficient in comparison to Ginkgo bilobas. The thought process behind this idea is Ulmus Mortons have larger leaves than Ginkgo bilobas, therefore Ulmus Mortons will be more photo efficient. The values we will be using to determine photo efficiency are PhiII, LEF, and Chlorophyll content(SPAD). The research being conducted is located around North Kedzie Hall at Michigan State University. A group of four students are conducting the research. We will study four quadrants, measuring the outermost leaves on the lower canopy. 360 total samples will be collected per week divided evenly among the six trees over three days. Each tree will be sampled to produce 20 samples with data values which are not negative. 5 leaves per quadrant of the one tree will be sampled in a random clockwise rotation. One day of data collection will result in 120 good sample values. Collection will begin in the Northeast quadrant followed by Southeast, Southwest, and Northwest quadrants. There will be no bias toward color or size when choosing leaves. The middle of the widest portion of the leaf that does not contain holes will be sampled. When measuring the leaf, the operator will make sure to apply firm pressure of the MultispeQ device (#123) paired with an Android tablet (#5) and allow for a reading to appear on the linked tablet. After 4 weeks of data collection all data points will be looked over to make sure values are within range. All values out of range will be flagged and thrown out. Once all applicable data points are available, the group will use a ONE-WAY ANOVA test with an alpha value of .05 to normalize all of the quadrants across each individual species. Once those are normalized the tree species will be compared against each other in a t-test to decide if there is a greater specified value.


Leaf Photosynthesis - MultispeQ Beta ONLY

Measures photosynthesis-related parameters in <15 seconds, including: Phi2, PhiNPQ, PhiNO, NPQt, qL, LEF, and SPAD. In addition, measures PAR (photosynthetically active radiation), ambient temperature and relative humidity.

Works with the MultispeQ Beta device only


  1. What Genus, Species, and tree code is being sampled? (Multiple Choice)
  2. What quadrant of the tree is being measured? (Multiple Choice)
  3. What leaf count in the specified quadrant is being sampled? (Multiple Choice)



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