Grasslands and Tundra. Temperate grasslands Found in areas of moderate rainfall, typically between 25 and 75 cm per year. Dry seasons sufficient to exclude most trees. Frequent fires. North American grasslands are dominated by “bunch grasses.”.
Found in areas of moderate rainfall, typically between 25 and 75 cm per year.
Dry seasons sufficient to exclude most trees.
The North American Great Plains can be divided into several prairie types. They differ primarily on the basis of the amount of rain and the time of the dry season.
Tundra ecosystems are found where cold, hard winds and/or permafrost prevent the growth of large woody plants. We recognize two types of tundra:
Arctic tundra is dominated by lichens, mosses, sedges, and small woody plants.
Alpine tundra is found high in mountains at all latitudes. Conditions are variable. Permafrost is rare.
Are grassland ecosystems equilibrium systems? This is significant in determining whether they will return if stresses are removed.
Some have suggested that they may have “multiple stable states.”
Population cycles are commonly seen in tundra habitats. They can be classified into three types:
Decreasers versus increasers
Invading species like cheatgrass (Bromius tectorum) has replaced native grasses over large areas.