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Biomes

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Biomes

Tropical rainforest:

* What: Hot and wet areas with broadleaved evergreen forest * Where: Within 5°N and S of the equator * Climate, limiting factors: High rainfall(2000-5000 mm yr-1), high temperatures( 26-28°) and high insolation, P>E rain washes nutrients out of the soil, so nutrients may limit plant growth * Structure: amazingly high levels of biodiversity: plants compete for light thus growing tall to absorb it, so there is a multi-storey profile to the forests called stratification. Many niches and habitat for animals and large mammals can get enough food * Net productivity: produce 40% of NPP of terrestrial ecosystems. Fast rates of decomposition, respiration and photosynthesis. Biomass gain very high, rapid recycling of nutrients * Human activity: more than 50% of world’s human population live in the tropics/subtropics forests exploited e.g. nutrients quickly exhausted by agriculture, commercial logging of timber * Issues: logging, conversion to grazing and to plantations forests exploited for economic development * Examples: Amazon rainforest, Borneo rainforest

Desert:

* What: dry areas usually hot in the day and cold at night as skies are clear and there is little vegetation to insulate the ground. Tropical, temperate, cold deserts * Where: cover 20-30% of the Earth’s land surface, about 30°N and S of the equator where dry air descends. Most are in the middle of continents * Climate, limiting factors: water limiting, E>P, precipitation irregular, less than 250 mm per year * Structure: few species, low biodiversity. Soils can be rich in nutrients (as they are not washed away). Drought-resistant plants, animals are adapted as well. Reptiles are dominant, small mammals can survive by being nocturnal, few large mammals, slow rate of decomposition * Net productivity: both primary and secondary are low (water limiting), plant biomass can’t build up to large amounts food chains are short * Human activity: nomadic tribes herd camels, goats as agriculture not possible, population density low. Oil has been found under deserts in the Gulf States. Irrigation is possible but evaporation rate is high so as water evaporates it leaves salts behind. Eventually crops will not grow because salt concentration is too high (salinization) * Issues: desertification – an area becomes a desert through overgrazing/overcultivation/ drought e.g. the Sahel * Examples: Sahara, Namib in Africa; Gobi in China

Temperate grassland:

* What: fairly flat areas dominated by grasses and herbaceous (non-woody) plants. * Where: in centres of continents 40-60°N of the equator * Climate and limiting factors: P=E or P slightly > E. Temperature range high as not near the sea, which moderates temperatures. Clear skies, low rainfall, threat of drought * Structure: grasses, wide diversity. Grazing animals, grasses die in winter, but roots survive. Decomposed vegetation forms a mat in which high levels of nutrients. Kangaroo, bison, antelope, carnivores e.g. wolves, coyotes. No trees * Net productivity: not very high * Human activity: cereal crops, black earth soils of the steppes rich in organic matter ideal for agriculture. Prairies in America less fertile-> have to add fertilizers. World’s “bread basket” wheat, maize. Livestock: cattle, sheep * Issues: dust bowl in 1930s America: overcropping and drought led to soil being blown away on the Great Plains (ecological disaster). Desertification because of overgrazing * Examples: North American prairies, Russian steppes, pampas in Argentina

Temperate forest:

What: mild climate, deciduous forest.
Where: between 40°-60°N and S of the equator.
Climate and limiting factors: P>E. Rainfall is 500-1500 mm per year. Winters freezing in some, milder in Western Europe due to the Gulf Stream. Temp range -30°C to + 30°C. Summers cool.
Structure: fewer species than tropical rainforests. Many woodlands show stratification, are dominated by one species, e.g. beech, oak. Trees have a growing season of 6-8 months. Rapid recycling of nutrients, although some are lost through leeching. Well-developed food chains with many autotrophs, herbivores (rabbits) and carnivores (foxes). Coniferous trees towards polar latitudes. P>E sufficiently to cause some leaching.
Net productivity: 2nd highest NPP after trop. rainforests, but much lower than this because of leaf fall in winter (so reduced photosynthesis), temperatures and insolation lower in winters
Human activity: much have been cleared for agriculture/ urban developments. Large predators wiped out (wolves, bears)
Issues: most of Europe’s woodlands cleared for farming, use as fuel, urban development. Often mineral wealth under forest mined,
Example: US Pacific Northwest

Arctic tundra:

What: treeless plan where subsoil is permafrost. Cold, low precipitation, long, dark, winters. 10% of Earth’s land surface. Youngest of all the biomes as it was formed after the retreat of the continental glacier 10000 years ago. P>E
Where: S of the Arctic ice cap and small amounts in southern hemisphere.
Climate and limiting factors: water, temperature, insolation and nutrients limiting. Frozen ground (permafrost), cold, high winds and little precipitation ->growing season only 6 weeks a year.
During spring and summer animals active, plants grow rapidly. Sometimes 30°C ->most of this energy absorbed as the latent heat of melting ice to water.
In the winter, northern hemisphere tilts away from the sun. In the spring equinox, northern hemisphere is in constant sunlight as arctic regions are tilted towards the sun ->never sets
In southern hemisphere, seasons reversed.
Structure: no trees, but thick mat of low-growing plants such as grasses. Adapted to withstand drying out with leathery leaves. Animals are adapted as well with thick fur to reduce heat loss.
Mostly small mammals e.g. lemmings, predators e.g. arctic fox, snowy owl. Most hibernate and make burrows. Simple ecosystems with few species. Low biodiversity, soil poor, low inorganic matter and minerals
Net productivity: very low. Slow decomposition so many peat bogs where most of the carbon is stored.
Human activity: mining, oil, herding reindeer
Issues: mining and oil extraction destroy tundra; global warming may eliminate Arctic regions, including the tundra forever. (Winter will be shortened, melting snow cover which could lead to flooding of some coastal areas, plants die, animal migrating patterns change).
Large amounts of methane in ice in clathrates which if released in the atmosphere could enormously increase greenhouse gases.
Examples: Siberia, Alaska

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