What desertification means?
The United Nations’ official definition says desertification is land degradation in typically dry areas resulting from various factors, including climatic variations and human activities. Many things can cause desertification. Drought, overgrazing, fire, and deforestation can thin out vegetation, leaving exposed soil.
What is soil erosion PPT?
Soil erosion is the washing or blowing away (by water or wind) of the top layer of the soil. Erosion whether it is by water , wind or tillage, involve three distinct action- soil detachment, movement & deposition. Sheet erosion is the movement of soil from rain drops splash and runoff water.
What is desertification answer?
Desertification is a type of land degradation in drylands in which biological productivity is lost due to natural processes or induced by human activities whereby fertile areas become increasingly arid.
What are examples of desertification?
Additional savannas, grasslands, and woodlands are common indications of desertification in arid and semi-arid areas. Well-known examples of this occurrence include, Europe’s Adriatic Sea, the Middle-East’s Saharan desert, and China’s Taklamakhan Desert. Sand dunes are formed in the Sahara Desert in the image above.
What foods cause deforestation?
Soy is the main culprit when it comes to deforestation in food. More than 80% of soy is fed to animals such as pigs – which is the pork sausages in your breakfast fry up. Unsustainable soy might also be fed to the chicken’s providing your eggs.
What is desertification PPT?
What is desertification • Desertification is land degradation process in arid and semi-arid areas. • It is a process by which fertile land is transformed into desert. • It becomes progressively drier • Unable to support any plant growth for food production.
How can we reduce land degradation?
5 possible solutions to soil degradation
- Curb industrial farming. Tilling, multiple harvests and agrochemicals have boosted yields at the expense of sustainability.
- Bring back the trees. Without plant and tree cover, erosion happens much more easily.
- Stop or limit ploughing.
- Replace goodness.
- Leave land alone.
What are the steps of desertification?
Key processes related to desertification include drought, primary production and carrying capacity, soil degradation, and use of water resources. The role of social factors is also important.
How can desertification be controlled?
1. Afforestation and planting of soil binding grasses can check soil erosion, floods and water logging. Desertification can be checked by artificial bunds or covering the area with proper type of vegetation. …
What is land degradation PPT?
Land degradation means: 1) Loss of natural fertility of soil because of loss of nutrients. 2) Less vegetation cover 3) Changes in the characteristic of soil. 4) Pollution of water resources from the contamination of soil through which water sweeps into ground or runoff to the water bodies.
How does deforestation affect desertification?
Deforestation is defined as the cutting down or clearing of trees from a wooded area. If trees are removed, the area can become much warmer and drier, which may result in desertification, which is a transformation of once fertile land into desert.
What are the causes of desertification?
‘Climatic variations’ and ‘Human activities’ can be regarded as the two main causes of desertification. removal of the natural vegetation cover（by taking too much fuel wood）, agricultural activities in the vulnerable ecosystems of arid and semi-arid areas, which are thus strained beyond their capacity.
What is deforestation definition PDF?
Deforestation is the conversion of forested areas to non-forest land use such as arable land, urban use, logged area or wasteland. Narrow definition of deforestation is: the removal of forest cover to an extent that allows for alternative land use.
Who is affected by desertification?
Africa is the continent most affected by desertification, and one of the most obvious natural borders on the landmass is the southern edge of the Sahara desert. The countries that lie on the edge of the Sahara are among the poorest in the world, and they are subject to periodic droughts that devastate their peoples.
What is the number 1 reason for deforestation?
1. Agricultural Expansion. The conversion of forests into agricultural plantations is a major cause of deforestation. The increase in global demand for commodities, such as palm oil and soybeans, are driving industrial-scale producers to clear forests at an alarming rate.