SOILS

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SOILS

10cm are form in 2.000 years

The available land air per habitat

Will reduce by half by 2050

Hectares of land chage of owner every year

This people are the poorest

So they distroy forest because they need land to live

In a world cost

The demand of soils is of 490 billion dollars

Because soils are invaluable

In 2011

24 million tones were lost

3.4 tonnes per person were used

Every year 13 million hectares of forest are cut down

adding manucultures and farming, which acelerates erosion

Soil distribution

This one is proadic and patchy

It have a group of factors that influence soils

CLORPT

Time

Parent material

Volcanic rock

Relief

Change in elevation

Orfganisms

Climate

Clasification of soils

Oxisol

Low fertility but very development horizon

Rainforest soil

Mollisol

Most fertile soil is the best for agriculture

is a grassland soil

Aridisol

Is a desert soil and has low amount of water

Ultisol

located in subtropical and humid places

Iron makes it red

Alfisol

Is in Broadleaf and decideous fores

Spodosol

Is low fertility and coniferous forest

Gelisol

Is pernafrost and is more close to the surface

Inceptisol

Slightly more horizon development

Entisol

Has no development of soil horizon

Layers of the soil

R horizon

Where there is only rock

C horizon

Where bedrock is degrading into soil

B horizon

Farthes plant roots will go for soils

A horizon

Where real surface soil is and there are organisms

O horizon

Is the uppermost and y more organic

They can be considered as

Silt

is between the other two

Sand

is the biggest

Clay

is the smallest

this ones have dofferent propeties

If a soil is more silt has characteristics of the other two soils

Is a soil is more sand will be worse retain of water bur easily plant growing

If a soil is more clay will retain more water but difficulty on plants growing

if a soil has 25% sand, 40% silt, 35% clay

is considered as Clay loam

created by rocks disposed by

Erosion

Smaller socks are carried from bigger rocks

By wind or water

Weathering

Breaking rocks into smaller rocks

By phisical or chemical process