Tundra
Tundra is a cold, mostly treeless biome found in high-latitude Arctic regions and high mountain environments. Short growing seasons, low temperatures, wind, frozen ground, and slow nutrient cycling shape its plants, animals, soils, and vulnerability to climate change.
What tundra is
Tundra is a biome shaped by cold conditions, short growing seasons, and limited tree growth. It is often open, windy, and low-growing, with plants close to the ground. The word can refer to Arctic tundra near the poles or alpine tundra above the tree line in mountains. Both are cold and exposed, but their soils, daylight, wildlife, and climate patterns differ.
Arctic tundra
Arctic tundra lies in high-latitude regions of Alaska, Canada, Greenland, Scandinavia, and Russia. Much of it is underlain by permafrost, with an active layer that thaws during the brief summer. Wetlands, thaw ponds, tussocks, polygonal ground, dwarf shrubs, mosses, lichens, sedges, and grasses can create a landscape that looks simple from far away but is highly patterned up close.
Alpine tundra
Alpine tundra occurs on mountains above the tree line. It is controlled by elevation rather than latitude, so it can exist far from the Arctic. Alpine tundra usually lacks permafrost as a continuous layer, but it still faces cold nights, intense sunlight, thin soils, wind, snowpack, and a short season for growth and reproduction.
Plants and adaptations
Tundra plants tend to stay low, grow slowly, and conserve heat and nutrients. Many have small leaves, hairy surfaces, mat-forming shapes, or underground storage structures. Mosses, lichens, sedges, dwarf willows, heaths, and cushion plants are common in different tundra settings. Because recovery is slow, trampling, vehicle tracks, and soil disturbance can last for years.
Animals and food webs
Tundra animals cope with cold, seasonality, and patchy food. Caribou, musk oxen, lemmings, Arctic foxes, wolves, migratory birds, insects, and many soil organisms are tied to short bursts of productivity. Some species migrate, some hibernate, and others change coat color or body condition with the season. Small changes in snow, insects, or plant timing can ripple through food webs.
Permafrost, water, and carbon
In Arctic tundra, permafrost affects drainage, soil temperature, roots, wetlands, and stored carbon. When frozen ground thaws, water can pond, drain away, or trigger ground collapse depending on ice content and terrain. Tundra soils can store large amounts of organic carbon because cold and wet conditions slow decomposition, but warming can expose that material to microbes.
Climate change
Tundra is warming rapidly in many regions. Scientists track shrub expansion, changing snow cover, deeper active layers, altered wildlife movement, coastal erosion, fire, and carbon exchange. The changes are not uniform: some places become wetter, others drier; some areas gain shrubs while others lose ground to thaw slumps, erosion, or lake drainage.
Why it matters
Tundra matters because it is habitat, homeland, carbon store, water system, and climate signal at once. It supports migratory species and northern communities, influences global carbon feedbacks, and preserves records of past environmental change. Its apparent emptiness is misleading; much of its value is in slow processes and seasonal connections.