Slide thuyết trình soil degradtion

SOIL DEGRADATION


What is the soil degradation?
=> The decline of soil quality and quantity
 Loss of soil micro-organisms.
 Removal of dead organic matter

Biological

 Reduction in stabilizing plant communities
 Changing to physical structure
 Changing to soil condition.
 Changes leading to acidification, toxic, nutrient
reduction, increasing salinity

Physical

Chemical


CAUSE BY TOXIC



THE CHANGING IN LAND USE



THE CAUSES OF EROSION
Population growth

Human

Farming technologies: Unsustainable agriculture, irrigation..etc
Overgrazing
Deforestation

These cause soil erosion, desertification, toxic and salinization


THE CAUSES OF SOIL DEGRADATION

 Over-grazing
 Action of wind, water..etc
 Faulty methods of agriculture, wrong plough
 Other factors cause by human ( mining activities, industrial
activity, etc.

Ex. Wind erosion reduces the productive capacity of soil


How to prevent soil erosion?

 Terrace farming: to prevent the soil from being washed away
 Increasing area under forests and must stop destroy forest.
 Leveling farm and correct plough
 Construction of dams: River cause soil erosion. Dams
are built in the upper course of rivers to control erosion of
soil
 ….

Rewrite the following passage from the prompts given below:

1. Soil / degradation / defined / health status / as a change / in the
soil / is.
2. Sustainable / land use can / help to / the impacts of agriculture /
and / livestock / reduce.
3. The / health of soil / concern to/ is / a primary / whose
livelihoods / depend / on /well managed agriculture / farmers and
the global community.
4. Erosion caused by deforestation / can / also / lead to / increased
flooding.
5. Soil erosion / when soil is removed / through / the action of wind
and water at a greater rate than it is formed/ occurs.
6. often / ploughing / is / a cause of / land degradation.