Sahel: The Sahel is a transitional zone in northern Africa separating the Sahara Desert from the savannahs of Sudan. all of the above. Overgrazing, Overcultivation, Deforestation, Irrigation, population growth. poor ag. The causes of desertification vary among the affected regions of the world owing to differences in their ecological characteristics and their social and economic structures and aspirations. The largest cause of desertification is overgrazing. growth of new plant life. The less land available to humans, the more we’ll exploit it. Desertification, also called ‘desertization’ occurs through a combination of human and natural processes which causes a reduction in productivity of the dryland (a dry region). Desertification does not … The largest cause of desertification is overgrazing. Desertification is one of the most important environmental challenges facing the world today, however it is arguably the most under-reported. (6) 1.massive erosion drought. Reference is made to the controversy over the human versus climatic causes of desertification. Desertification is taking place much faster worldwide than historically and usually arises from the demands of increased populations that settle on the land in order to grow crops and graze animals. In general, desertification is caused by variations in climate and by unsustainable land-management practices in dryland environments. By their very nature, arid and semiarid ecosystems are characterized by sparse or variable rainfall. What causes it? Desertification usually happens on the edge of deserts. Causes. Vulnerability to desertification in Africa is assessed using the information on soils, climate, and the previously evaluated land resource stresses. Vulnerability to desertification in Africa is assessed using the information on soils, climate, and the previously evaluated land resource stresses. Desertification process. Desertification, a phenomenon referring to land degradation in arid, semi-arid and dry sub-humid regions as a result of climatic variations and human activities, is considered as one of the most severe environmental and socio-economic problems of recent times. The former includes Desertification results in continued degradation of land and of fragile ecosystems. Although the word “desert” is normally associated with sand, desertification does not necessarily mean the land is becoming sand-covered. 1. It is the purpose of LTER to understand these factors that cause state transitions. Various causes of desertification are deforestation which further leading to soil erosion and decreasing the quality of the soil. Therefore, desertification is one of the greatest environmental challenges today. Why does deforestation cause desertification? This degrades the quality of soil. Lesson: Causes of desertification: Soil erosion. 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. There is little detailed data on the economic losses resulting from desertification, although an unpublished World Bank study suggested that the depletion of natural resources in one Sahelian country was equivalent to 20% of its annual Gross Domestic Product (GDP). "We know that desertification is a process with multiple triggers, so it is necessary to address it from a very broad point of view,” explained the responsible for … Desertification is the degradation of land in arid, semi-arid, and dry sub-humid areas. Sometimes the two can combine and natural processes of desertification that are already underway can be accelerated and made worse by humans. What Causes Desertification Desertification is caused by natural events, such as droughts and wildfires, as well as by human activities, such as land mismanagement and global warming. From Millennium Ecosystem Assessment report on Ecosystems and Human Well-Being Desertification Synthesis. 3. Too many animals eat all the vegetation on the area leaving it bare to wind erosion. If the timing of water doesn’t match the agricultural season you may have too much water when you … The vast majority of desertification in the present day is caused by harmful human activity. Desertification is a significant global ecological and environmental problem. In the Las Cruces region, grasslands occupy only 10% of what they did in the 1800’s. There are several causes of land degradation with most of the causes related to drought, climate change, poor agricultural practices, and poor water management. The causes of desertification are both natural and man-made. Uncontrolled logging and open-pit mining are activities that humans do without control. Most of the rain (or snowmelt) runs off the soil surface, or is absorbed by the soil but then evaporates out of the soil surface – resulting in both floods and droughts. While it is known that human activities have great impact on changing the surface of the biosphere post industrialization, what is becoming more apparent is how the rate of affection is currently causing long-term changes to the systems of the biosphere. Desertification on the other hand is defined as a process of land degradation in arid, semi-arid and dry sub-humid areas, resulting from various factors, including climatic degradation. http://imstuck.wix.com/imstuckgcserevisionDesertification - What Are The Causes of Desertification? Deforestation of forests is the main cause of the decrease in humidity and the desertification process. Causes of desertification range … Desertification . It makes land areas flood-prone, causes soil salinisation, results in the deterioration of the quality of water, silting of rivers, streams and reservoirs. South Africa ratified it on 28 September 1997. Extended droughts may mimic desertification, but vegetation may recover when seasonal rains return. Helmut Geist (2005) identified more than 100 formal definitions. Because drought is defined as a deficit in water supply, it can be caused by a number of factors. To add to the small nation’s problems, Burkina Faso currently finds itself in a process of desertification. What causes desertification in the Sahel? Sometimes the two can combine and natural processes of desertification that are already underway can be accelerated and made worse by humans. Populations move to find land that can provide the food and water they need. Land and water management: Sustainable land use can fix issues such as overgrazing, overexploitation of plants, trampling of soils and irrigation practices that cause and worsen desertification. Overgrazing is the major cause of desertification worldwide. What Causes Desertification? GeoLiteracy . The digital lesson explores the impact of human-environment interactions on both land & people. Desertification Hot deserts are an important ecosystem with distinct characteristics and adaptations. Assess which areas would be prone to droughts and desertification on both a global, regional and local scale. It is caused by a variety of factors, such as climate change and human activities. Desertification also has grave natural consequences. Human hands or natural occurrences can exacerbate or spark desertification. Most experts on desertification blame overpopulation, overstocking with livestock, overcutting of trees, poverty, warfare, inadequate technology or education, the tragedy of the commons, or shifting cultivation. The causes of desertification. The former includes The causes, both proximal and underlying as well as the consequences of desertification are discussed. Although drought and famine were unavoidable components of life in this harsh region, the people were relatively prosperous and developed agricultural and livestock practices that allowed local populations to endure and recover from the extremes of nature (Office of Technology … Other factors that cause desertification include urbanization, climate change, overuse of groundwater, deforestation, natural disasters, and tillage practices in agriculture that make soils more vulnerable to wind. How overgrazing causing desertification? Weather patterns move the water in the air around. This is the process that sees productive land turned into non-productive desert. There are five main causes of desertification. If they’re not reforested, they inevitably end up as wastelands directly from soil erosion and desertification. Populations move to find land that can provide the food and water they need. The largest cause of desertification is overgrazing. It is a major barrier to meeting basic human needs in drylands and leads to losses in terms of human well-being. Name 5 human causes of desertification? practices improper soil moisture managment erosion and salinization deforestation global climate change. Keyword: Impact, causes, desertification. Chief causes are deforestation, overgrazing, overdrafting of groundwater, increased soil salinity, overagriculture, and global climate change, all fundamentally … Forests are being cut down at much larger scale than ever before, to be used as fuel, to provide products we use in our daily life, or to simply create more space for agriculture to sustain growing human population. It is caused primarily by human activities and climatic variations. Causes . What causes drought? The most immediate cause of human-caused desertification is the destruction and/or removal of the land’s stabilizing vegetation — a process known as deflation. The More rain, sleet, hail, and snow can occur where there are moist, low-pressure air systems. - an increasing population results in larger desert areas being farmed. The causes of desertification. This book provides an examination into the causes and prospects of desertification through a systematic review of 132 sub national case studies. In arid, semi-arid and dry sub-humid regions, land degradation that results in a loss of vegetation cover is caused by several factors, including climatic change and … Protection of vegetative cover: Protecting soil from wind and water erosion helps to prevent the loss of ecosystem services during droughts. Desertification is caused by a number of different issues. INTRODUCTION Desertification is defined as a process of land degradation in arid, semi-arid and sub-humid areas due to various factors including climatic variations and human activities. Man-made desertification begins when the available rainfall becomes less effective. Land degradation causes a decline in land productivity and is therefore likely to lead to increased levels of poverty. Tags: Climatic variations: Climate change, drought, moisture loss on a global level Human activities: These include overgrazing, deforestation and removal of the natural vegetation cover ¢ by taking too much fuel wood £, agricultural activities in the vulnerable ecosystems of The Sahel is the semi-arid transition region between the Sahara desert to the north and wetter… For our example we look at desertification in Badia, Jordan and pupils complete a table which requires them to explain why Badia is at risk. Loss of vegetation cover is an immediate cause of land degradation. However, if this area is not used for other purposes for some … What Causes Desertification? Overgrazing causes vegetation to be removed, causing soils to be exposed to water and wind. This book provides an examination into the causes and prospects of desertification through a systematic review of 132 sub national case studies. Desertification is induced by several factors, primarily anthropogenic during the Holocene. Land degradation causes a decline in land productivity and is therefore likely to lead to increased levels of poverty. An EFFECT of desertification is: answer choices . Desertification affects as much as one-sixth of the world's population, seventy percent of all drylands, and one-quarter of the total land area of the world. It is a major barrier to meeting basic human needs in drylands and leads to losses in terms of human well-being. Deforestation. Cutting a huge number of trees in one go for the benefit of creating opportunities for the industrialists and the rich adversely affects the land in the longer ... Overgrazing. Animal grazing is a huge problem for many areas that are starting to become desert biomes. ... Climatic Variations. ... Excessive Use Of Fertilizers And Pesticides. ... More items... The amount of precipitation at a particular location varies from year to year, but over a period of years, the average amount is fairly constant. In some areas, classic overgrazing along with ways that water drains in mountainous regions has contributed to soil erosion, which leads to desertification. By their very nature, arid and semiarid ecosystems are characterized by sparse or variable rainfall. The main causes of desertification include:Population growth - the population in some desert areas is increasing. ...Removal of wood - in developing countries, people use wood for cooking. ...Overgrazing - an increasing population results in larger desert areas being farmed. ...Soil erosion - this is made worse by overgrazing and the removal of wood. ...More items... Humans are driving the transformation of drylands into desert on an unprecedented scale around the world, with serious consequences. Indigenous peoples who traditionally used dry-lands did so in a nomadic fashion, with the tribe and their herds following water and food availability and not grazing in one place for an extended period of time. In desert regions conditions are not only getting warmer but … Desertification causes increased levels of migration. " Desertification is caused by a combination of factors that change over time and vary by location. As recently as 2005, considerable controversy existed over the proper definition of the term "desertification." Desertification creates a kind of snowball effect. What vegitation once grew in Loess Plateau? We start by looking at what desertification is and the semi-arid areas that are most at risk from it. food shortages. This band of dry land extends across the African continent from Senegal in the west to Sudan in the east. Home to a third of the human population in 2000, drylands occupy nearly half of Earths land area. The causes of desertification are multiple, including both climatic and anthropic factors. As the effects of climate change undermine livelihoods, inter-ethnic clashes are breaking out within and across states and fragile states are turning to militarization Some scientists include Eritrea in the Sahel. The root cause of desertification is poor soil conservation leading to soil degradation. Animals pull out roots of vegetation, leading to soil erosion and reduced regrowth and larger animals may compress soil … These crops were not only conducive to Marathwada’s arid climate but were drought-resistant and led to moisture harvesting. Cutting a huge number of trees in one go for the benefit of creating opportunities for … What Causes Desertification . The most widely accepted of these was that of the Princeton University Dictionary which defined it as "the process of fertile land transforming into desert typically as a result of deforestation Overgrazing is the major cause of desertification worldwide. Powerpoint and resources going through the causes and effects of desertification. Between 1990 and 2005, Mexico lost over 11 million acres of forest for various reasons, but with conversion to agriculture and grazing as the leading causes. These include indirect factors such as population pressure, socioeconomic and policy factors, and international trade as well as direct factors such as land use patterns and practices and climate-related processes. Deforestation is one of the leading human causes of desertification. In simplest of terms; desertification is defined as the loss of trees and shrubs, leaving the land barren. What causes desertification? There are a variety of factors that cause the issue of desertification. Deforestation has even been caused by extensive war—throughout history fire has often been used to deprive the enemy of necessary resources. More immediate causes of desertification are evidenced and attributed to no other than humans. According to a recent report from the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services(IPBES), “land degradation is almost always the result of multiple interacting causes”. It uses a meta-analytical model to determine whether proximate causes and underlying driving forces fall into any patterns, to identify mediating factors, feedbacks, cross-scalar dynamics and typical pathways. The Green Belt for North African Countries, Arab League Educational, Cultural and Scientific Organization (ALECSO), Tunisia (in Arabic). The Causes of Desertification. Sheep, cattle … The Causes And Progression Of Desertification. Desertification is an ecological degradation process that occurs in soils. The (mostly human) consequences of land degradation and desertification are then outlined. What did human over-use of the Loess Plateau cause? Desertification can be defined as the degradation of land in areas that experience arid, semi-arid and dry sub-humid climates. It is when fertile land becomes dry and unusable. Desertification is caused by a variety of human factors. These factors include unsustainable farming, clearing of forestation and trees, overgrazing and mining . Further investigation is necessary, the … In areas of low precipitation, like Sub-Saharan Africa, long droughts that turn arid land to unproductive, barren soil are a frequent cause of desertification. Human health and social effects. A drought is a period of drier-than-normal conditions that results in water-related problems. Desertification is occurring in the Sahel region because farmers are using the slash and burn method to clear land for crops. People need the wood and so fewer trees mean that the ground is left open to wind and water erosion. Farming of an average land is causing desertification … The phenomenon of desertification is very old, but the scientific understanding of its causes and consequences, and the global efforts made to address it, are very recent. Desertification Causes Starvation and Deaths in Africa. Google Scholar Desertification is a process when semi arid areas become drier and less able to support plant life, and is generally caused by human actions such as … Other factors that cause desertification include urbanization, climate change, overuse of groundwater, deforestation, natural disasters, and tillage practices in agriculture that make soils more vulnerable to wind. This is constantly changing. The direct causes of desertification can be broadly divided between those relating to how the land is – or isn’t – managed and those relating to the climate. On other hand overgrazing, over cultivation and salinization in irrigated croplands are also affecting desertification rates. strong economies. ÔClimatic variationsÕ and ÔHuman activitiesÕ can be regarded as 2 the two main causes of desertification. Abstract PIP: Desertification is a result of overexploitation of the land through overcultivation, overgrazing, deforestation, and poor irrigation practices. In general, desertification is caused by variations in climate and by unsustainable land-management practices in dryland environments. The What are some misconceptions about desertification? 2.2. Natural Causes of desertification Drought is one of the major natural causes of desertification in the drylands. It is caused by a variety of factors. Desertification In The Sahel EXCERPT What is the Sahel? The desert area in the world is getting bigger. Desertification can be reduced by adopting the following strategies: Planting more trees - the roots of trees hold the soil together and help to reduce soil erosion from wind and rain. CAUSES AND EFFECTS OF DESERTIFICATION IN THE SAHEL The Sahel, a semiarid grassland, runs along the southern edge of the Sahara Desert. human environment interaction. Desertification is, "land degradation in arid, semi-arid, and dry sub-humid areas resulting from various factors, including climatic variations and human activities". Although blessed with a rich history, the country has very few natural resources and an almost non-existent industrial base. Primary causes of desertification in Somaliland include deforestation, overgrazing, mismanagement of land and soil erosion, compounded by the 3-year drought that has been ravaging the region. Q. Desertification can be reduced by adopting the following strategies: Planting more trees - the roots of trees hold the soil together and help to reduce soil erosion from wind and rain. They provide opportunities for development but also face challenges such as desertification. The CAUSES of desertification are: answer choices . Earlier, the main crops cultivated here used to be cereal and oilseeds. Desertification is caused by natural events, such as droughts and wildfires, as well as by human activities, such as land mismanagement and global warming. Indigenous peoples who traditionally used dry-lands did so in a nomadic fashion, with the tribe and their herds following water and food availability and not grazing in one place for an extended period of time. Desertification is a huge drain on economic resources. HelpSaveNature offers an insight into the causes and effects of desertification on the environment, and ultimately on human life. the misuse of water and soil mainly for agriculture produces an alkalization of soils causing plants to die and not grow in place, which causes soils to dry out. Human causes of desertification include overgrazing, the buildup of salt in irrigated soils, and topsoil erosion. 30 seconds . What are the causes of desertification? The main causes of desertification in the Sahel region are Climate Change, Population Pressure and Agriculture. Desertification causes increased levels of migration. Tags: Question 3 . This process is a result of the growing imbalance between population, resources, environment, and development. What are the causes of desertification? The process is natural, but the human causes of desertification have vastly outpaced its natural speed. Desertification is, "land degradation in arid, semi-arid, and dry sub-humid areas resulting from various factors, including climatic variations and human activities". - the global climate is getting warmer. Our influence on natural causes such as erosion or rainfall patterns is slim, however human-caused desertification is perhaps the leading threat to fertile lands.
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