Shebin sheraf
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Shebin sheraf

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  • Slash and burn- short term methd of cultivatin n which land z cleard by destroingnd burning tress ndothrvegitation 4a temporary agricultural use…..Salinization-The accumulation of salts in soil to the extent that plant growth is inhibited. This is a common problem when crops are irrigated in arid regions; much of the water evaporates and salts accumulated in the soil. Also see Leaching Requirement. Dessication z a process of becoming cmpltly dried out..
  • Exacerbate---irritate or worse..
  • Ravages -  To bring heavy destruction onDegradation – reducingErratic - Irregular; changeable.

Shebin sheraf Shebin sheraf Presentation Transcript

  • Shebin SherafPHOENIX
  • OVERVIEWo What is it?o Regions affected by desertificationo Causeso Impactso Indian scenarioo Summary
  • What is Desertification• Land degradation in arid, semi-arid and dry sub-humid areas resulting from various factors, including climate variations and human activities.
  • The process through which a desert takesover a formerly non-desert area. When aregion begins to undergo desertification, thenew conditions typically include a significantlylowered water table, a reduced supply ofsurface water, increased salinity in naturalwaters and soils, progressive destruction ofnative vegetation, and an accelerated rate oferosion.
  • Estimates of percentage of humanactions causing desertification are:overgrazing (35%),Deforestation (30%),other agricultural activities (28%),overexploitation of fuel wood (7%),and bioindustrial activities (1%)Human impacts can exacerbate butnot initiate desertification
  • Climatic Effects• Natural global cycles of dry and rain• Change over significant amounts of time• Not induced by human actions, but can work in combination with them.
  • IMPACTS: ECOLOGICAL
  • IMPACTS:ECONOMICAL Loss of fertility and productivity in soils 􀂃 In China alone, about $6.5 billionannually islost to the effects of desertification 􀂃 Worldwide $300-600 billion lostannually 􀂃 Since 1985, Kazakhstan has lost12.5 millionacres of grain-growing land. 􀂃 Benefits of prevention andrestoration are 2.5xgreater than allowing desertification tocontinue.
  • IMPACTS: HUMANDesert lands are inhospitable,sometimes uninhabitable. 􀂃 2/3 of arable land in Africa atrisk. 􀂃 Loss of arable land meansincreased poverty, famine. 􀂃 Food insecurity leads to more environmentalrefugees and displaced persons, more forcedmigrations. 􀂃 People are important, too.
  • As local humanpopulations haveincreased, theirescalating food needshave lengthened thecultivation period.Grain crops are nowplanted longer intothe dry seasonpreventing trees andgrasses fromreproducing as theydid in the past. Muchof the land has
  • INDIAN SCENARIO"In India, the problem of Desertification is recurrent withvisible evidence of its ravages in Jaisalmer, Barmer, Jodhpurand Bikaner districts.According to a recent estimate by Govt. of India, 32. 7 percent of the countrys land is affected by differentdegradation processes.Arid areas in our country experience an annual rainfallbetween 100 and 400 mm with a very high coefficient ofvariation ranging from 40 to 70 per cent.Low and erratic rainfall coupled with extreme temperaturesand intense solar radiation (200-600 cal cm2 day 1) resultsin frequent crop failures and considerably affects theagricultural economy in the region.
  • HOW TO PREVENT DESERIFICATION?-Integrating land and water management to protect soils fromerosion, salinization, and other forms of degradation,-Protecting the vegetative cover, which can be a major instrumentfor soil conservation against wind and water erosion.-Integrating the use of land for grazing and farming whereconditions are favourable , allowing for a more efficient cyclingof nutrients within the agricultural systems.-Applying a combination of traditional practices with locallyacceptable and locally adapted land use technologies.
  • -Giving local communities the capacity toprevent desertification and to manage dryland resourceseffectively.-Turning to alternative livelihoods that do not depend ontraditional land uses, such as drylandaquaculture,greenhouse agriculture and tourism-related activities, isless demanding on local land and natural resources, and yetprovides sustainable income.-Creating economic opportunities in dryland urban centersand in areas outside of drylands.
  • SUMMARYDesertification is a growing worldwideproblemthat impacts a huge percentage of the world’spopulation. 􀂃 The economic cost of desertification is inthemany hundreds of billions of dollars. 􀂃 Desertification can be slowed and evenreversed by re-vegetation, waterconservation,livestock management and wise agriculturalmethods.