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Temperate broadleaf and mixed forests are a temperate and humid biome. The typical structure of these forests include four layers. The upper most layer is the canopy which is composed of tall mature trees. Below the canopy is the three-layered, shade tolerant understory. The top layer of the understory is the sub-canopy which is composed of smaller mature trees, saplings, and suppressed juveniles canopy layer trees awaiting an opening in the canopy. Below the sub-canopy is the shrub layer, composed of low growing woody plants. Typically the lowest growing (and most diverse) layer is the ground cover or herbaceous layer.
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Trees
Characteristic dominant broadleaf trees in this biome include oaks (Quercus spp.), beeches (Fagus spp.), maples (Acer spp.), and birches (Betula spp.).1 The term "mixed forest" comes from the inclusion of coniferous trees as a canopy component of these forests. Typical coniferous trees include: Pines (Pinus spp.), firs (Abies spp.), and spruces (Picea spp.). In some areas of this biome the conifers may be a more important canopy species than the broadleaf species.
Climate
Temperate broadleaf and mixed forests occur in areas with distinct warm and cool season, which give it a moderate annual average temperature (5.5-15.6 Celsius). These forests occur in relatively warm and rainy climates, sometimes also with a distinct dry season. A dry season occurs in the winter in East Asia and in summer on the wet fringe of the Mediterranean climate zones. Other areas have a fairly even distribution of rainfall, annual rainfall is typically over 600 millimetres (24 inches) and often over 1500 millimetres (60 inches). Temperatures are typically moderate except in parts of Asia such as Ussuriland where temperate forests can occur despite extremely harsh conditions with very cold winters.
Temperate broadleaf and mixed forest ecoregions
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Indomalaya Temperate broadleaf and mixed forests
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| Eastern Himalayan broadleaf forests | Bhutan, India, Nepal |
| Northern Triangle temperate forests | Burma |
| Western Himalayan broadleaf forests | India, Nepal, Pakistan |
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Neotropic Temperate broadleaf and mixed forests
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| Juan Fernandez Islands temperate forests | Chile |
| Magellanic subpolar forests | Argentina, Chile |
| Polylepis forests | Bolivia, Peru |
| San Felix-San Ambrosio Islands temperate forests (Desventuradas Islands) | Chile |
| Valdivian temperate rain forests | Argentina, Chile |
See also
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External links
- Temperate forest
- Map of the ecozones
- Index of North American Temperate Broadleaf & Mixed Forests ecoregions at bioimages.vanderbilt.edu
- Terraformers Canadian Forest Conservation Foundation
References
Wikipedia content modification information:
- This page was last modified on 23 November 2008, at 02:55.
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