Se ha denunciado esta presentación.
Utilizamos tu perfil de LinkedIn y tus datos de actividad para personalizar los anuncios y mostrarte publicidad más relevante. Puedes cambiar tus preferencias de publicidad en cualquier momento.

Land resources

4.319 visualizaciones

Publicado el

it gives a clear picture of how land today is affected and how we can conserve it

Publicado en: Medio ambiente
  • Inicia sesión para ver los comentarios

Land resources

  2. 2. LAND AS A RESOURCE  Land is the fundamental resource as it provides shelter and food to man.  In India the total geographical land area is 329 million hectares i.e.,13% of the total area of the world.  In terms of size India ranks SEVENTH among the countries of the world.  The utilization of land in India is not to its optimum potential.
  3. 3. LAND DEGRADATION Land degradation refers to  Deterioration of soil  Loss of productive capacity of soil  Loss of fertility of the soil  it is estimated that India losses annually 6000 MILLION TONS of top soil.
  4. 4. National Commission for Agriculture has estimated that the total area subjected to land degradation is 175million hectares.  Out of this,  150 million hectares by water and wind erosion  6 million hectares by water logging  8 million hectares by salinity.
  5. 5. MAN INDUCED LAND SLIDES  The movement of earthy material from higher region to lower region due to gravity is called mass movement.  If it is through a definite plane then it is land slide. landslides can cause, o In areas repeatedly rocked by earthquake o Heavy and prolonged rainfall
  6. 6. LANDSLIDE DISASTER DUE TO HUMAN ACTIVITIES  Removal of vegetation in the sloppy areas  Underground mining activities  Vehicular transport in the unstable sloppy regions  Building of huge dams
  7. 7. SOIL EROSION  Soil erosion is the washing or blowing away of the top layer of the soil.  It washes away the nutrients in soil such as nitrogen, phosphate and potassium are lost resulting in infertility of the soil.  In India in 1971 alone 6000 million tons of soil was lost.
  8. 8. CAUSES OF SOIL EROSION RAINFALL- raindrops directly strike the soil surface and detach the soil particles. WIND- transportation of soil and sand particle by wind by wind is best seen in deserts and along the seashore. BIOTIC FACTORS- grazing by cattle, cutting down of trees, agricultural activities, construction of buildings and laying of roads.
  9. 9. DESERTIFICATION  Desertification is a process by which fertile land becomes desert. Causes for the origin of manmade deserts,  Removal of trees  Modern methods of agriculture instead of more traditional  Over exploitation of fertile soil particularly in areas of low rainfall by cultivating cash crops.
  10. 10. SOIL CONSERVATION  The aim of soil conservation is to increase food production without soil loss.  National Wasteland Development Board was set up by the Central Government in 1995 to bring 5 million hectares of wasteland/year.