Average basal area growth (in cm2) by species for five-year period before and after topping for Maryland study area.
| Topped trees | Control trees | |||
|---|---|---|---|---|
| Species | 1967-1971 | 1972-1976 | 1967-1971 | 1972-1976 |
| Beech, American | 40 | 50 | 70 | 60 |
| Hickory | 40 | 40 | 30 | 30 |
| Oak, white | 60 | 60 | 60 | 70 |
| Pine, Virginia | 50 | 40 | 50 | 40 |
| Sweetgum | 50 | 40 | 70 | 80 |
| Sycamore | 170 | 190 | 160 | 190 |
| Average | 50 | 50 | 60 | 60 |