L11+_25+Sep_+Climate+and+earth_s+major+ecosystem+I+_Lee_

L11+_25+Sep_+Climate+and+earth_s+major+ecosystem+I+_Lee_ -...

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BISC 003 Environmental Science: Climate & Earth’s Major Ecosystems (CH. 5)
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BIOMES Areas sharing similar climate, topographic and soil conditions, and roughly comparable communities.
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Climates and Biomes h The main factor determining the global position of a biome is climate , in particular: Temperature Precipitation (rainfall and snowfall) Climate - a region’s general pattern or long term patterns of weather. h Biome distribution is also affected by the prevailing landforms of an area – i.e. the topography. In particular, mountains have a major influence.
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The dominant plants identify a biome.
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Biomass of Biomes h A major variation between the different biomes is the amount of living things in them - the biomass . Biomass is measured in grams per quare metre square metre . Rainforests have the most biomass. Deserts have the least biomass. h Biomass reflects the productivity of a region.
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Major Ecosystems h Terrestrial Biomes: Tropical rainforest Tropical seasonal forest Desert Grassland Temperate forest Coniferous forest Savanna Tundra h Aquatic ecosystems: freshwater, marine.
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World Biomes
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Earth’s major terrestrial biomes Tropical Rainforest Coniferous Rainforest Grassland Desert Tundra Savanna Temperate Deciduous Forest Mountain 7 biomes are represented in this example
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Surface areas of biome types Biomes Area (million mile 2 ) % of Land Total 18.2 31.6 11.6 20.1 Croplands 6.2 10.8 Wetlands 2.0 3.5 19.6 34.0 Total Land Area 57.6
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Cool dry air falls Moist air rises - rain Tundra Taiga Temperate forest and grassland Desert Moist air rises, cools and release
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This note was uploaded on 12/21/2009 for the course BISC BISC003 taught by Professor Qian/ren/ko during the Fall '09 term at HKUST.

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L11+_25+Sep_+Climate+and+earth_s+major+ecosystem+I+_Lee_ -...

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