How many tree species are enuf?

As you all may already know, forest coverage in the Anthropecene was reduced by ~15% and many forests are now managed for salable products. Whether 'product' is enough, or whether ecosystem services could come better from other forest-management ways, has set ecologists to chatter for several years

Latest is this:
DOI: 10.1038/ncomms2328
not behind paywall so all can enjoy.

If anyone here wishes, we could look at the earlier publications. If not I'll just do what I do, because dead wood slowly finding its way back to CO2 is a habitat bonanza for many critters. Love 'em, hate 'em, I don't care because it is my own personal thrill.