I need to know the differing capabilities of pine, oak, and maple trees to convert carbon dioxide into oxygen.

Answer 1

I'm afraid I don't have a direct answer to your question, but I found an interesting research paper on photosynthetic parameters of tree species, including several oak and maple-related species (genera Quercus and Acer).
In this study, maximum net photosynthesis was recorded in some Quercus (relatives of oaks). CO2 fixation capacity seems to be related to nitrogen content.
Nothing about pines, I'm afraid. But in any case, the rate of CO2 fixation is always higher in younger specimens.
I hope this helps!

The article:
http://www.snr.missouri.edu/~sullivan/Papers/TreePhysPap.pdf
The home page of one of the authors, with links to more publications on similar subjects:
http://www.geos.ed.ac.uk/homes/mwilliam/publications.html

Answer 2

Did you know that it takes 1-1/2 full grown Evergreen Fir trees to meet the oxygen needs of one persons lifespan?

Answer 3

I never knew there was a difference! I just figured all trees converted CO2 to oxygen at the same rate, but maybe not. My curiosity is piqued! :o)