I want to carry out a Pearsons correlation to look relationships between methane flux from soil under different plantation treatments (i.e spruce, pine etc) and environmental conditions (i.e. level of water table, temperature etc).

I am comparing 50 weeks worth of measurments (one flux measurement for each week and mean temp (for example) for each week).

The flux values for some treatments are not normally distributed, I can transform them to log values to achieve a normal distribution however do I then need to use the log of the flux values from every treatment data set and log the enviromental variable values too? i.e. if I use log values for one variable do all other variable values need to be log too?

Hope that makes sense! Any help would be great I am going round in circles here trying to work out if it matters or not! Sorry for asking such a stupid question! But I can't seem to find a straightforward answer and I keep confusing myself!

Cheers