land degradation processes affect about 46 percent of the whole continent and create a health risk to people living in the regions far beyond the affected areas. Asia, on the other hand is the most severely affected conti-nent in terms of the number of people affected by deser-tification and drought. Around 90 percent of rangelands and 80 per cent of rain-fed farmlands in the area are affected by degradation - including soil erosion, deforestation, and loss of woody vegetation which makes them less able to bear crops and pasture. 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. In extreme cases, soil becomes unfit for cultivation. (IICA). Soil degradation. For these reasons, Bot et al. These are very real and at times severe issues. Severely degraded soils have lost more than 50% of their potential. Silting of drainage, canals, rivers and reservoirs results in increased floods and droughts. Severe degradation is already occurring, with rates of soil loss reaching at least ten times the natural rate of soil formation. These grim prospects are … Human activities and impact of the climate affects its properties such as depth, organic matter content, pH, salinity and fertility. Irreversible damage would have occurred over huge areas, and it is doubtful whether reclamation would ever be possible on an economic basis.
Degradation leads to reduction in crop yield in the affected lands and a possible decline in cropping intensity.
Severe land degradation is now affecting 168 countries across the world, according to new research released by the United Nations Convention to Combat Desertification (UNCCD). The erosion caused by rains, rivers and winds as well as over-utilization of soils for agriculture and low use of manures have resulted in turning the soils infertile, as for example, in the plains of the Nile and the Orange River. Farmers in developing countries are particularly badly affected.
Soil degradation is a phenomenon that reduces the soil’s capability to provide sustainable environmental services.
Soil erosion is a major threat to food security and ecosystem viability, as current rates are orders of magnitude higher than natural soil formation. The areal extent of global degraded areas varies depending on the definitions (Eswaran et al., 2001).Globally, about 24% of the global land area has been affected by degradation and over 1.5 billion people live on degraded lands (IFPRI, 2012).Using a comprehensive analysis to determine the extent, degree, and drivers of soil degradation, Oldeman et al. Impact of Soil Degradation: The following are the impacts of soil degradation: 1. Slight degradation refers to land where yield potential has been reduced by 10%, moderate degradation refers to a yield decrease from 10-50%.
Dryland populations are often These impacts include compaction, loss of soil structure, nutrient degradation, and soil salinity.
It has threatened the livelihood of millions of peasants, for agriculture is their economic mainstay. Many soils suffer from various types of degradation, that can ultimately reduce their ability to produce food resources. Unchecked, this would result, by the year 2010, in an African landscape that had a greatly reduced potential for agricultural production.
In China over 400 million people are affected by soil erosion, causing annual economic losses of US$10 billion, while the UNCCD says Indian reports …
4. In this way, TerraSTAT aimed to represent the land area affected by degradation, in contrast to the actual degraded area represented by … 2. (2000) used severity classes based on both degree and extent of soil degradation from GLASOD to develop the TerraSTAT country data.
Half of the topsoil on the planet has been lost in the last 150 years.
"The rural population in low-income countries loses between 10 to 20 percent of their income through land degradation," said von Braun. In addition to erosion, soil quality is affected by other aspects of agriculture.
Desertification includes land degradation in arid, semi-arid and dry sub humid areas resulting from various factors, including climatic variations and human activities. The figure, based on submissions from countries to the UN, is a marked increase on the last analysis in the mid-1990s, which estimated 110 states were at risk. Soil erosion is accelerating in developing countries of Asia, Africa, and Latin America. Kingston, Jamaica, 24 June 2016. Land degradation—the deterioration or loss of the productive capacity of the soils for present and future—is a global challenge that affects everyone through food insecurity, higher food prices, climate change, environmental hazards, and the loss of biodiversity and ecosystem services.