Excursion day 2

Today we did a lot of measurments... 

To see how much light that is absorbed by a certain amount of leaves we measure the incoming light and the light below the canopy. The difference between these values is the amount of light absorbed by the canopy. 

 Measuring incomming radiation on a field

measure the radiation below a forest canopy 

 This sensor register the radiation

We also wanted to know how effecient the photosynthesis are in a leaf, and how much it respire. We had a pretty advanced instrument, measuring the difference in CO2 concentration for a certain time and the difference in water vapor concentration in the same time. Then we calculate the respiration and the Photosynthesis.. very easy! =)

This instrument measure the CO2 uptake in a leaf and the H2O output from a leaf

 Johan Uddling, one of the teachers at one measure station

 We are measuring the uptake of CO2 by the leaf

Much better weather today than yesterday, we're happy for that. In the afternoon we had free studies, reading articles and prepair for a seminar tomorrow.