lesson 18: vegetation of the earth
TRANSCRIPT
THERE AREDIFFERENT KINDS
of PLANTS & ANIMALS ON EARTH.
Butonly certain kinds
are NATURALLY
FOUND
place…PARTICULAR@ any
Polar Bearsin the Arctic
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Elephantsin Central Africa
Kangaroosin Australia
VEGETATION OF THE EARTH
VEGETATIONVEGETATI
ONmeans the plant life of a region or the plant
community. It means all ground cover by plants, and is the main element of the
biosphere.
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Climate
the most important factor that determines the type of vegetation of an area.
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Plants or the natural vegetation on Earth have its own grouping or plant association.
CLASSIFICATION OF
VEGETATION
VEGETATION
TROPICAL
RAINFOREST
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A good example of low latitude forest.
There is no dry month in a rainforest.Trees can grow as high as 40 to 60 meters growing in closed formation.
Tropical Rainforest or Silva
Tropical ForestGrow in places where there is plenty of rain, thick soil and sunshine.
Forest Floor
Remains wet and dark. They have evergreen trees because they are always green throughout the year.
Animal’s life is plentiful in a tropical rainforest.
Tropical RainforestOne can find so many species of plants as well as
animals associated with it.
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Tropical Rainforest- A rainforest is not a jungle. A jungle is a very dense ground growth found along riverbanks.
Animal’s life is plentiful in a tropical rainforest.
Some animals in the rainforest.
Moose Black bear Marten Wolverine
Lynxes Beavers Porcupines
Predators -- Prey
TROPICAL
GRASSLANDS
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Grasslands are natural pastures
and have been a place for centuries by huge hers of grazing animals.
GRASSLANDS in the tropics usually grow on rich soils and most grassland areas have been converted
to or used as croplands
Serengeti Plain
Grasslands are often found in areas where yearly rainfall is between 25 and 75 centimetre (10 to 30 inches).
Grasslands are sufficient for many species of grasses.
African Savannah
Tropical grassland of Africa is found in the
Serengeti Plain. The Serengeti is known as
“a variety of animal population”.
Savannah is a grassland with scattered trees.
TROPICAL
DESERTS
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Desert – are extremely dry areas. The rainfall maybe less than 25 centimetres (10 inches) of rain per year.
Xerophytes- they have will developed root system for absorbing water.- store water in their thick, fleshy stems.
Desert shrubs are composed of bushes and some form of grasses that could withstand long drought periods.
Xerophytic Plants –are plants found in desert regions.
Cactus have a long and widespread roots in order to look for water.
SAHARA ARABIAN GOBI DESERT
HOT Desert
MEDITERRANEAN
FOREST
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Are found in the subtropical areas of the world, particularly in the Mediterranean region.
MEDITERRANEAN FORESTS
Is primarily composed of trees with leaves-leaves that die, fall off and regrow during seasonal growing cycles.
Broadleaf Deciduous Forest
Deciduous Forest are commonly found in: United States Great Britain Central Europe Some parts of China Siberia
Rainfall averages about 100cm (40 inches) per year
Variety of different deciduous climax vegetation:
a.Local condition of soilb.Drainagec.Climate
Fox
Raccoons
Squirrel
CONIFEROUS FORESTS
Combination of broadleaf and needle-leaf trees.Found within the boundary zones of continental climates with abundant rainfall and warm
summer period and climates with very cold winters and less rainfall.
STEPPEIs a continuous short grass cover which extends quite extensively without any tree interruption.
PRAIRIEIs a tall grass cover that extends continuously to cover
a wide area without interruption from trees.
MIDDLE LATITUDE GRASSLANDS
TUNDRA
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WHERE NO
FOREST VEGETATI
ON GROWS.
TUNDRA
A tundra is composed of
MOSSES SEDGES
LICHENS
Antarctic Desert is the largest desert in the world.
Tundra vegetation is also considered a desert plant association, referred to as
Cold Desert Vegetation.
CHARACTERISTICS OF TUNDRA: Long cold winters and short
cool summers Low precipitation (less
than 10 inches per year) and dry winds
Permafrost - ground that is permanently frozen
PermafrostHas no cracks or pores,
nothing can penetrate it--neither plant roots nor water.
Arctic Foxes
Polar Bears
Collared Lemmings
Hares
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