Treefall gap

A treefall gap is a distinguishable hole in a forest with vertical sides extending through all levels down to an average height of 2 m (6.6 ft) above ground. These holes occur as result of a fallen tree or large limb. The ecologist who developed this definition used two meters because believed that 'a regrowth height of 2 m was sufficient' for a gap to be considered closed, but not all scientists agreed. For example, Runkle believed that regrowth should be 10–20 m (33–66 ft) above the ground. Alternatively, a treefall gap as 'the smallest gap be readily distinguishable amid the complexity of forest structure.' A treefall gap is a distinguishable hole in a forest with vertical sides extending through all levels down to an average height of 2 m (6.6 ft) above ground. These holes occur as result of a fallen tree or large limb. The ecologist who developed this definition used two meters because believed that 'a regrowth height of 2 m was sufficient' for a gap to be considered closed, but not all scientists agreed. For example, Runkle believed that regrowth should be 10–20 m (33–66 ft) above the ground. Alternatively, a treefall gap as 'the smallest gap be readily distinguishable amid the complexity of forest structure.' There is no upper limit in gap size. However, it must be caused by a tree or a large limb. For example, a field would not be considered a treefall gap. Tree falls are commonly caused by old age, natural hazards, or parasitic plants (e.g. certain epiphytes).