Dynamics of American beech regeneration 10 years following harvesting in a beech bark disease-affected stand in Maine.

摘要

Root sprouting following harvesting of American beech (Fagus grandifolia) has resulted in the development of dense, slow-growing thickets in many stands throughout Maine and the northeastern USA. The problem is compounded by the presence of beech bark disease, as most sprouts arise from roots of disease-susceptible genotypes. Ten-year post-harvest regeneration conditions were examined in a central Maine beech stand harvested in both winter and summer with partial cutting and clearcuts. Initially, sprouts in winter cuts survived longer than those in summer cuts. After 10 years, we found that beech regeneration survival in the winter treatments continued to be higher than in the summer treatments. Disease-resistant American beech of high vigour left in clearcuts without the protection of surrounding trees were highly susceptible to decline and death from exposure. Leaving a small buffer of unharvested trees around resistant beech is recommended..