Find flux of CO2: convert (μmolCO2 (mol air)^-1) to (mgC)(m^-2 of ground hr^–1)

AI Thread Summary
To convert CO2 concentration data from (μmolCO2 (mol air)^-1) to a flux of (mgC)(m^-2 of ground hr^–1), the slope of the trendline represents the rate of change of CO2 concentration over time, specifically in units of (μmolCO2 (mol air)^-1 per second). The experiment involves measuring CO2 uptake by grass in both closed and clear chambers, with the clear chamber showing a decrease in CO2 due to photosynthesis. To calculate the flux, the volume of the chambers is essential, as it affects the total amount of CO2 measured. The final goal is to express the CO2 flux in mgC per square meter per hour. Understanding the slope and incorporating chamber volume will facilitate the necessary calculations.
mroldboy
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Homework Statement


I am doing an experiment to find the difference in photosynthesis between different areas of grass.

I have and am taking more measurements. But essentially I need to convert the data I have into a flux per area over time.

the data logger records the data of CO2 concentration in (μmolCO2 (mol air)-1). I had it set to do so every second and recorded data fro 4-5 minutes.

I have the slope of the trendline, but I am unsure what that slope is.

Is the slope (μmolCO2 (mol air)-1) per second since its rise/run?


Homework Equations


equations of the data I have

closed chamber: y = 2.3778x + 588.26

clear chamber: y = -0.3184x + 399.19


The Attempt at a Solution



basically I want to find how much CO2 was used. so if I have X amount of CO2 being emitted from the ground that is my background noise. I did that with a closed chamber so no light got in and therefor no photosynthesis occurred. Then measured the same grass with a clear chamber and got a decrease. This decrease should be more since there was still background noise. So the grass was using at least as much CO2 as was emitted from the ground plus some more.

I can't actually do the calculations since I am missing an important piece of data in the volume of the chambers. which were different sizes as well.

I want my flux in (mgC)(m^-2 of ground hr^–1)

Can anyone give me a basic walkthrough of how to do this?
 
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mroldboy said:
I have the slope of the trendline, but I am unsure what that slope is.

Is the slope (μmolCO2 (mol air)-1) per second since its rise/run?

Yeah. The slope of the graph is the rate of change of CO2 concentration with time. Therefore, it has dimensions of [concentration]/[time] in the units you happen to be using for those two quantities (which you indicated).
 
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