- C-1: Even-Aged Spruce-Balsam Fir Stands
- C-2: Elm-Ash-Cottonwood
- C-3: Nearly Pure Even-Aged Eastern White Pine
- C-4: Jack Pine
- C-5: Even-Aged Management of Northern Hardwoods
- C-6: Red Pine
- C-7: Upland Central Hardwoods
C-5: Even-Aged Management of Northern Hardwoods
Source: U.S. Department of Agriculture, Forest Service. 1985. Northern Hardwood Notes (Note 4.03). U.S. Government Printing Office, Washington, DC 20402.
Note: Find the current basal area per acre of your stand on the vertical axis and the number of trees per acre on the horizontal axis. Where these lines meet is the average tree diameter. Next extend a line paralleling the average tree diameter line to the appropriate specie curve. (Use the hemlock and basswood curves labeled 100 percent only if the stand you are thinning is at least 80 percent stocked with that particular species. Use the dashed curves for stands that are about 50 percent stocked with that particular species.) Go horizontally from the intersection of the average tree diameter liis optimum for that stand.