I can't be certain on how the lime will affect the trees however I doubt making the PH level better in your soil will do anything but help. Same thing with the wildlife. I would also consider a silt pond in front of the big pond that will serve as a trap for all of the pine needles etc.

"They that can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety."- Ben Franklin

"Timid men prefer the calm of despotism to the tempestuous sea of liberty."-Thomas Jefferson