Do hardwoods give off more oxygen than pine trees?

In my state, Weyerhauser (a company) harvests and buys pine trees... meaning tens of thousands of acres are cleared and planted in pine trees which have a quick maturation (appx. 30 years). Is the destruction of hardwoods to do this detrimental to the overall production of oxygen? Someone told me hardwoods produce... show more In my state, Weyerhauser (a company) harvests and buys pine trees... meaning tens of thousands of acres are cleared and planted in pine trees which have a quick maturation (appx. 30 years). Is the destruction of hardwoods to do this detrimental to the overall production of oxygen? Someone told me hardwoods produce over 300 times the amount of oxygen.
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