Tall Trees Experiment

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Aim

To gather sapflow and environmental meteorological data from Sequoia sempervirens specimens to study biophysical limits to tree height.

Method

Data logging field stations were installed in 15 specimens of Sequoia sempervirens. Sensor clusters were placed at 3 heights on each tree: near the crown, bottom of crown and at the base of the tree.

The following illustrates an installation example.

Sensor Model Description Number Installed Top of Crown SR2 Solar radiation 1 HT1 Ambient Temperature & Relative Humidity single sensor, radiation shield 1 RG2 Rain gauge 1 AN2 Anemometer 1 LW2 Leaf Wetness 2 HRM Heat Ratio Method Sapflow 4 Stem Hygrometer Plant Water Potential 1 Bottom of Crown HRM Heat Ratio Method Sapflow 4 Base of Tree HRM Heat Ratio Method Sapflow 4 Stem Hygrometer Plant Water Potential 1

Results

Sapflow
November through February
up to 1069 liters H₂O transpired per day
up to 297 liters H₂O absorbed by leaves per day

Conclusions

During periods of rain, a negative sapflow was observed.

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