Positional Photosynthetic Activity of Acer Rubrum

Overview

Our team aimed to determine the differences between the photosynthetic activity between the interior leaves and exterior leaves of Acer rubrum trees. The tree codes were 2007024107, 2007024108, and 20070241*09, and all trees were nine years old.

We collected data using a MultiSpeQ device (#222) and focused on ΦII, LEF, SPAD, and NPQt values. ΦII values lower than zero or higher than 0.85 were excluded from analysis and SPAD values lower than zero or higher than 100 were excluded from analysis.

The samples measurements were taken from the leaves on three differing Acer rubrum trees. We sampled 10 leaves from each quadrant of a tree - 5 of these leaves were from the interior of the tree, and 5 of these leaves were from the exterior. This added up to 40 leaves per tree for our chosen three trees. Together, this made for 120 measurements recorded on each day. Our team measured twelve times over a duration of four weeks, for a total 1,440 measurements. Measurements started in the NW quadrant, but then rotated clockwise. Quadrants were measured from exterior to interior.

Our data was analyzed using ANOVA and t-tests.

Protocols

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

Questions

  1. What is the tree code? (Multiple Choice)
  2. What directional quadrant of the tree is being examined? (Multiple Choice)
  3. Interior leaves (toward the trunk) of the tree, or exterior leaves (toward the outside) of the tree? (Multiple Choice)
  4. What randomly sampled leaf is being measured? (Multiple Choice)

Locations

Discussions

Team

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