What is the subalpine zone between forest and alpine vegetation like?

The subalpine zone acts as a transition belt between the closed forest below and the alpine vegetation above. This area is characterized by a gradual decline in tree height and an increase in spacing between trees, a region often referred to as the kampf zone.1

As conditions become harsher due to increased wind, lower temperatures, and impoverished soil, trees in this zone often take on a stunted, twisted, and deformed growth form known as krummholz (or elfinwood). These individuals are typically infertile and must survive significant environmental stresses, including desiccation, frost damage, and the abrasive effects of windblown snow.12

While the subalpine environment shares challenges with the subarctic—such as high winds, low temperatures, and a short growing season—it is distinct in its higher light intensity, greater ultraviolet radiation, and more pronounced daily temperature fluctuations. The transition from forest to treeless alpine tundra is generally considered an equilibrium space where the forces of upward regeneration are balanced by downward mortality.1