Snow Damage to Branches of Young Red Pine Stands Related to Plantation Density
Snow damage was measured in a 9-year-old northern Michigan red pine (Pinusresinosa) plantation following three severe winters. Snow related injury was usually in the form of complete branch breakage or partially severed lateral branches. Densities of 2000 trees/ha suffered three to four times more damage as those with 500 trees/ha.Injury was primarily concentrated at about 75 cm above the ground, a height reflecting snow depth. This corresponded to the location of the fourth whorl where branch injury was twice as extensive in plots with 1000, 1500, and 2000 trees/ha as those with 500 or 750 trees/ha.Although few trees have as yet died from this snow damage, many have been severely weakened and are thus predisposed to insect attack, disease infestation, and further mechanical injury.