Seventeen 140m2 plots cover a range of forest types including oak savanna, closed-canopy oak, northern hardwood, pine, cedar, and low-land hardwood. Trees were mapped and diameters measured when plots were established; remeasurements will be made at 10-year intervals. The plots serve as focal points for short-term (1-2 year) studies of litterfall, forest floor dynamics, nitrogen mineralization, and organic matter distribution.