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The World's Biomes
Transcript of The World's Biomes
Marine algae supply much of the world's oxygen supply and take in a huge amount of atmospheric carbon dioxide.
The evaporation of the seawater provides rainwater for the land. Deserts cover about one fifth of the Earth's surface and occur where rainfall is less than 50 cm/year. Most deserts have a considerable amount of specialized vegetation, as well as specialized vertebrate and invertebrate animals. Soils often have abundant nutrients because they need only water to become very productive and have little or no organic matter. There are four major types of deserts including hot and dry, semiarid, coastal, and cold. Today, forests occupy approximately one-third of Earth's land area, account for over two-thirds of the leaf area of land plants, and contain about 70% of carbon present in living things. They have been held in reverence in folklore and worshipped in ancient religions. However, forests are becoming major casualties of civilization as human populations have increased over the past several thousand years, bringing deforestation, pollution, and industrial usage problems to this important biome.Present-day forest biomes, biological communities that are dominated by trees and other woody vegetation (Spurr and Barnes 1980), can be classified according to numerous characteristics, with seasonality being the most widely used. Distinct forest types also occur within each of these broad groups.There are three major types of forests, classed according to latitude: tropical, temperate, and borial forests (taiga). Grasslands are characterized as lands dominated by grasses rather than large shrubs or trees. In the Miocene and Pliocene Epochs, which spanned a period of about 25 million years, mountains rose in western North America and created a continental climate favorable to grasslands. Ancient forests declined and grasslands became widespread. Following the Pleistocene Ice Ages, grasslands expanded in range as hotter and drier climates prevailed worldwide. There are two main divisions of grasslands: tropical grasslands (or savannas) and temperate grasslands. Tundra is the coldest of all the biomes.
Tundra comes from the Finnish word tunturi, meaning treeless plain.
It is noted for its frost-molded landscapes, extremely low temperatures, little precipitation, poor nutrients, and short growing seasons.
Dead organic material functions as a nutrient pool.
The two major nutrients are nitrogen and phosphorus.
Nitrogen is created by biological fixation, and phosphorus is created by precipitation.
Tundra is seperated into two types: arctic and alpine. The Great Lakes ecosystem is a perfect example of a biome. Forest biomes contain roughly what percentage of carbon present in living things? Which of the world's biomes is the coldest?