I have been working on a technique that can continuously measure stomatal conductance at 5 minute intervals. The calibrated technique shows a R2 of > 0.95 with the SF-4/5 sensor. I am currently preparing a MS, but in the meantime here is a blog article:
http://www.edaphic.com.au/sap-flow-digest/continuous-stomatal-conductance-measurements/
I am interested to hear feedback on others experiences with continuously measuring stomatal conductance. From my understanding, most gs measurements require a manual, or semi-automated, meter.
In my opinion this sensor measures the sap flow in (or as close as possible to) the petiole, which is correlated to the stomatal conductance, however, they are not the same thing.
I would compare it to measuring sap flow and transpiration, both are different but correlated...
Dear Michael,
as said above, the sensor you used is a sap flow meter. Its output is mostly relevant when you want to estimate sap flow rates or transpiration for the single petiole/stem where the probe is mounted. Stomatal conductance and stomatal aperture are regulated by several environmental factors. The relationship you've found is expected as tranpiration, sap flow rate and stomatal conductance are all related to each other, but I wouldn't say it could be used as an appropriate tool for continuous stomatal conductance determination.
The main question that I would like to ask you is: why do you need to have continuous stomatal conductance measurements? Isn't it better to have a continuos transpiration estimation? Of course it all depends on your research question. If you can answer these questions we can proceed to the next step and have a further discussion on the topic.
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