1.Extremely cold climate
2.Low biotic diversity
3.Simple vegetation structure
4.Limitation of drainage
5.Short season of growth and reproduction
6.Energy and nutrients in the form of dead organic material 7.Large population oscillations
Arctic tundra is located in the northern hemisphere, encircling the North Pole and extending south to the Coniferous forests of the Taiga. The arctic is known for its cold, desert-like conditions. The growing season ranges from 50 to 60 days. The average winter temperature is -34° C (-30° F), but the average summer temperature is 3-12° C (37-54° F), which enables this biome to sustain life. Rainfall may vary in different regions of the arctic. Yearly precipitation, including melting snow, is 15 to 25 cm (6 to 10 inches). Soil is formed slowly. A layer of permanently frozen subsoil called permafrost exists, consisting mostly of gravel and finer material. When water floods the upper surface, bogs and ponds may form, providing moisture for plants. There are no deep root systems in the vegetation of the arctic tundra; however, there are still a wide variety of plants that are able to resist the cold climate. There are about 1,700 kinds of plants in the arctic and sub arctic, and these include low shrubs, sedges, reindeer mosses, liverworts, and grasses. All of the plants are adapted to sweeping winds and instability of the soil. Plants are...