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Download Biomes - Downey Unified School District
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Terrestrial Ecosystems The 7 Major Biomes Tundra • Tree-less – has no trees • Permafrost- a permanently frozen layer of soil under the surface Taiga • Found South of Tundra • Biome dominated by cone bearing trees (gymnosperms) • Long Cold Winters • Short Summers • Nutrient Poor Soil Temperate Deciduous Forest • Has trees that lose leaves in the fall/winter. • Pronounced seasons Temperate Grassland • Dominated by grasses • Rich Fertile Soil • Support large grazing animals • Often converted into farmland. Tropical Rain Forest • • • • • Characterized by tall trees Near equator Contain 1/5 of known species Canopy – Tops of the trees Epiphytes – plants that live on the branches of trees Ex: orchid • Poor Soil Savanna • Tropical or sub tropical grasslands. • They have alternating wet and dry seasons. • Prolonged periods of drought. Desert • Dry and arid environment. • Lack of available water. Less than 25 cm of rainfall a year. • Vegetation is sparse – cactus and low lying shrubs prevalent. Mountain Zones Polar Ice
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