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2021-05-15

What is the effect of desertification on soil?

What is the effect of desertification on soil?

Clearly, desertification will affect all soil functions, with greatest impact being on biomass and food production, biological habitat, and environmental services. When soils are degraded, they lose their capacity to capture and store water, nutrients and carbon and to support microbiological processes.

What is the effect of desertification?

Desertification affects topsoil, groundwater reserves, surface runoff, human, animal, and plant populations. Water scarcity in drylands limits the production of wood, crops, forage, and other services that ecosystems provide to our community.

Does desertification cause climate change?

Desertification not only causes loss of productivity with serious impacts on food production, future food security and economic development (Safriel and Adeel, 2005; Hussein, 2008), but also causes the release of greenhouse gases to the atmosphere, thereby accelerating global warming.

What is desertification and its causes?

Desertification is a type of land degradation in which a relatively dry land region becomes increasingly arid, typically losing its bodies of water as well as vegetation and wildlife. It is caused by a variety of factors, such as climate change and human activities.

What is the main cause 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 are the physical causes of desertification?

Factors which may cause desertification include:

  • Climate change – especially long dry periods, causing drought.
  • Too many animals within the area – leads to overgrazing .
  • Population growth – traditional, less intensive, methods of farming decline.

What are the impacts of desertification in the Sahel?

The effects of desertification In 2014 the UN stated that 20million people in the Sahel region of Africa faced hunger and required $2 billion in food aid due to desertification. The loss of vegetation can cause severe soil erosion. The nutrients in the soil get washed or leached away leaving soil infertile.

How does Salinisation cause desertification?

Salinisation greatly reduces soil quality and vegetation cover. Due to the destruction of the soil structure, saline and sodic soils are more easily eroded by water and wind. When land degradation occurs in arid, semi-arid and subhumid areas it is known as desertification.

How does afforestation reduce desertification?

Planting the trees reverses desertification by preventing soil erosion and providing nutrients for other plants and crops to grow.

What is the most effective way to protect dry lands from desertification?

Answer Expert Verified. Answer: Planting a tree belt. Explanation: The most effective method by which the desertification of the soil can be controlled is by planting more and more trees.

What is the result of wind erosion in desert?

Wind erosion abrades surfaces and makes desert pavement, ventifacts, and desert varnish. Loess is a very fine grained, wind-borne deposit that can be important to soil formation.

Which of the following is the result of wind erosion?

Not only does wind erosion damage the land by drying out soil and reducing the nutrients of the land, it can also cause air pollution. Enveloping crops, covering highways, and invading homes, the sand, dust, and dirt created from wind erosion can impact plant and human life in numerous ways.

What landforms are caused by wind erosion?

Landforms Created by Wind Erosion

  • Fixed Sand Sheets. Fixed sand sheets are undulating sandy hills that are found.
  • Ventifacts. Ventifacts are stones of various sizes that have been faceted by abrasion.
  • Ripples. Ripples are small sand waves with wavelengths of about one meter.
  • Yardangs.
  • Sand Dunes.

What is the effect of desertification on soil?

Desertification has caused major environmental and socioeconomic problems in many arid and semiarid areas of the world1. It causes soil degradation and severely reduces potential land productivity2–4, which causes degradation of the ecosystem and its associated ecosystem services.

How does desertification of an area occur?

Human activities that contribute to desertification include the expansion and intensive use of agricultural lands, poor irrigation practices, deforestation, and overgrazing. These unsustainable land uses place enormous pressure on the land by altering its soil chemistry and hydrology.

What is the decline in soil quality caused by improper use?

Soil degradation is the decline in soil condition caused by its improper use or poor management, usually for agricultural, industrial or urban purposes. It is a serious environmental problem. Soils are a fundamental natural resource, and are the basis for all terrestrial life.

How can farmers prevent slow down soil erosion?

You can reduce soil erosion by:

  1. Maintaining a healthy, perennial plant cover.
  2. Mulching.
  3. Planting a cover crop – such as winter rye in vegetable gardens.
  4. Placing crushed stone, wood chips, and other similar materials in heavily used areas where vegetation is hard to establish and maintain.

What is the biggest challenge for soil scientist today?

The biggest challenge for soil science is to combine the important role of soils for climate change with its’ crucial role in food production for the growing world population.

What are the major problematic soils?

The types are: 1. Acidic Soil 2. Alkaline Soil 3. Saline Soil.

How do humans harm soil?

Soil erosion occurs naturally by wind or harsh climatic conditions but human activities include overgrazing, overcropping and deforestation. Overgrazing occurs when farmers stock too many animals such as sheep, cattle or goats on their land.

Why is soil so important?

Soil is our life support system. Soils provide anchorage for roots, hold water and nutrients. Soils are home to myriad micro-organisms that fix nitrogen and decompose organic matter, and armies of microscopic animals as well as earthworms and termites. Soil plays a vital role in the Earth’s ecosystem.