Low-density (32 ft2
/acre residual basal area) and medium-low density (60 ft2
/acre residual basal area) thinnings were studied over a 4-year period in a declining white pine stand on the Massabesic Experimental Forest in southern Maine. Gross basal area growth at 60 ft2
was about three-fourths the rate of the control and more than twice as much as the 32 ft2
thinning, while diameter growth at 60 ft2
was twice that of the control and about the same as the low-density treatment. Regeneration under the thinning treatments was abundant. Declining white pine stands apparently respond quickly to low-density thinnings and the optimum level, among the treatments studied, is about 60 ft2
residual basal area.
Leak, William B.; Yamasaki, Mariko. 2013. Effects of low-density thinning in a declining white pine stand in Maine. Res. Note NRS-170. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 6 p.