Pine trees have a pH range of what ?
I found these two sites about pine trees GROWING in acid but nothing about the pH of the tree itself.
Take your pick of answers from this forum.
http://forums2.gardenweb.com/forums/load/soil/msg050944526608.html
Here is another site that is more about th tree and less about the effects of the tree.
http://en.wikipedia.org/wiki/Pine#Ecology