Chapter 6.2

Frodo

Soil resources  Soil is a resource  Many things you need depend on healthy soil  Food, Paper, Plants, etc

Topsoil  The mineral- and nutrient-rich portion of the soil is called topsoil  Topsoil is the upper, outermost layer of soil, usually the top 2 inches (5.1 cm) to 8 inches (20 cm).

Topsoil TTopsoil is very important! GGood topsoil absorbs and holds the water that plants need. GGood topsoil is produced by many years of interactions between soil and plants BBBBut topsoil can be damaged or lost quickly! PROTECT TOPSOIL

Deforestation serena serena

Deforestation

The loss of forest,called deforestation,can also harm soils. The loss of forest,called deforestation,can also harm soils. Deforestation can lead to severe soil erosion. Soils and microclimates can change so much that trees cannot grow there again. Deforestation can lead to severe soil erosion. Soils and microclimates can change so much that trees cannot grow there again.

Deforestation There are about 2 million trees chopped down every day. A lot of trees were used for papermaking,throwaway chopsticks …… People infinitum to cut. Unfortunately,more than half of the world ’ s old- growth forests have already been lost. There are about 2 million trees chopped down every day. A lot of trees were used for papermaking,throwaway chopsticks …… People infinitum to cut. Unfortunately,more than half of the world ’ s old- growth forests have already been lost.

Example Loess Highlands Shangrila

Deforestation Affect

People want to make more economic efficiency. They think nature ’ s resourse is inexhaustible,and thy think they the ruler of the world. They are not aware of that doferestation will lead to many seriouse Consequence. The law system is imperfect. People have the wrong values and ethics. People want to make more economic efficiency. They think nature ’ s resourse is inexhaustible,and thy think they the ruler of the world. They are not aware of that doferestation will lead to many seriouse Consequence. The law system is imperfect. People have the wrong values and ethics.

trees be cut down nothing to hold… soil be blown away soil be washed into…

The area of desert is growing. desertification

What is desertification? Lower land productivity caused by overfarming, overgrazing, seasonal drought, and climate change.

Why it happens? The most common cause of desertification is the over cultivation of desert lands. Over-cultivation causes the nutrients in the soil to be depleted faster than they are restored. Improper irrigation practices result in salinated soils, and depletion of aquifers.

Areas affected Drylands occupy approximately 40–41% of Earth’s land area and are home to more than 2 billion people. Drylands occupy approximately 40–41% of Earth’s land area and are home to more than 2 billion people.

The Dust Bowl A ranch in Boise City, Idaho, is about to be hit by a cloud of dry soil on April 15, 1935.

The Great Plains Today

SOIL USE AND SUSTAINABILITY Giovannate & Neo

statistics  The forest coverage of the world is around 30% The desert coverage of the world is also around 30%

To reduce wateroff and erosion Diffierent time To stop erosion and the loss of nutrient Problem solving  I.Crop Rotation II. Contour Plowing