Great question!
You should know...your spindly pine forest makes me a bit jealous! Pine plantations that have gone a bit feral make the PERFECT laying yard for shiitake, oyster, and other log grown mushrooms. One of the best benefits is the year-round shade factor, which means you can keep your logs healthy and happy. We've even had Stropharia fruit in pine straw! for more see the factsheets at
http://mushrooms.cals.cornell.edu
...oh yeah, and the book!
Speaking of Pine straw, this is another interesting "crop" that I saw in action at the University of Missouri Agroforestry site. We mention it in the book briefly. The straw is harvested in 7 - 10 year rotations, which appears to be renewable from their research. LINK:
http://agebb.missouri.edu/agforest/archives/v13n2/gh6.htm
Finally, I leave you with a question. What is found in natural pine stands that is edible? Medicinal? Functional? How can you shape the succession to increase diversity. Pine is usually mixed in stands with other tree like Oak, Hickory, etc etc.
Some food for thought.
cheers
Steve