For more on ecology and statistics of the forest-change data of the Bormann plot and the Duke Forest at large, see:
Bormann, F.H. 1953. The statistical efficiency of sample plot size and shape in forest ecology. ECOLOGY 34: 474-487.
Ickstadt, K. and R. Wolpert.
McDonald, R.I., R.K. Peet, and D.L. Urban. 2002. Environmental correlates of oak decline and red maple increase in the North Carolina Piedmont. CASTANEA 67: 84-95.