Land Resources (Evs)


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Presentation on the land resources of mainly India

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Land Resources (Evs)

  1. 1. LAND RESOUCES<br />
  2. 2. Non-renewable resource<br />Essential for functioning <br />Supports all living beings<br />But is depleting day by day<br />LAND AS A RESOURCE<br />
  3. 3. What is soil?<br />The weathered surface of earth’s crust which is associated with living organism and the products of their decomposition.<br />Pedogenesis - process of soil formation<br />The main constituent of land<br />SOIL<br />
  4. 4. The process of breaking up of rocks into smaller particles is called weathering.<br />Three types of weathering:<br />Physical<br />Climate<br />Biological<br />WEATHERING<br />
  5. 5. LAYERS OF SOIL<br />
  6. 6. Red soil<br />Largest soil group<br />Rich in iron, mangnesium<br />Found in maximum parts of India.<br />Black soil(regur)<br />Large clay factor,without gravel<br />Contains high moisture and extrimely sticky<br />Mostly seen in central India <br />TYPES OF SOILS IN INDIA<br />
  7. 7. Laterite soil and lateretic soil<br />Lack in fertility and low value for production<br />Contains potash,nitrogen and phosphates<br />Alkaline soil(reh,usar)<br />Found in drier areas<br />Mostly not suitable for cultivation<br />Imperious , thus slow drainage<br />Mountain and forest soils of himalayan region<br />Found in depressions of valley and slopes<br />Provides heavy growth to plants<br />
  8. 8. LAND DEGRADATION<br /><ul><li>Land degradation refers to a decline in the overall quality of soil, water or vegetation condition commonly caused by human activities. </li></li></ul><li>Deforestation by fire clearence<br />Wind erosion<br />Water erosion<br />Pollution including industrial wastes<br />Poor farming practises<br />Livestocks including overgrazing<br />CAUSES<br />
  9. 9. Loss of quality of soil and decline in vegetation<br />salinity/ brackishness of land<br />Drought<br />Soil erosion<br />shortage of fuelwood and building materials in many areas.<br />EFFECTS<br />
  10. 10. Landslides<br /><ul><li>A landslide (or landslip) is a geological phenomenon which includes a wide range of ground movement.
  11. 11. Such as downward sliding, falling, or flowing of masses of soil, rock, and debris.</li></li></ul><li>Loss or absence of soil nutrients (e.g. after a wildfire)<br />Erosion of the toe of a slope by rivers or ocean waves<br />Weakening of a slope through saturation by snowmelt, glaciers melting, or heavy rains<br />Earthquakes<br />Volcanic Eruptions<br />Causes Of Landslides<br />
  12. 12. Vibrations from Machinery or Traffic<br />Blast’s<br />Construction<br />Forestry Activities<br />Causes Of Landslides (By Human Beings)<br />
  13. 13. Falls<br />Soil or Rock masses freefall from Air.<br />Generally result from undercutting by erosion.<br />Slides<br />Failure among one or more narrow planes.<br />Types Of Slides : <br />Slumps,<br />Glide,<br /> Rockslide<br />Types Of Landslides<br />
  14. 14. Flow<br />Caused by Internal Displacement in Soil.<br />Types Of Flow :<br />Earthflow<br />Rockslide<br />
  15. 15. SOIL EROSION<br />MEANING<br /> The process by which rocks fragments and soil are detached from the original site, transported and then eventually deposited at some new locality is termed as soil erosion.<br />
  16. 16. Normal and Geological Soil Erosion<br />(Erosion done naturally)<br />Accelerated soil erosion<br />(Loss of Soil by Man’s Activity)<br />KINDS OF SOIL EROSION<br />
  17. 17. Water Erosion<br />Sheet erosion<br />Rill erosion<br />Gully erosion<br />Wind erosion<br />Saltation<br />Suspension<br />Surface creep <br />AGENTS OF SOIL EROSION<br />
  18. 18. Landslides or slip erosion<br />Biotic agencies cause soil erosion<br />Overgrazing<br />Deforestation<br />
  19. 19. DESERTIFICATION<br />
  20. 20. The transformation of aerable or habitable land to desert,as by a change in climate or destructive land use<br />Viewed as both a process and the resulting condition<br />Is a global problem<br />Leads to abandoned,desert like landscapes<br />WHAT IS IT?<br />
  21. 21. Overgrazing<br />Deforestation<br />Overcultivation<br />Inappropriate irrigation<br />Drought<br />Climate change <br />CAUSES<br />
  22. 22. Reduced biological productivity<br />Biodiversity loss<br />Loss of food security<br />Increase in soil erosion<br />Decreasing water availablity<br />Loss of bio-diversity<br />CONSEQUENCES<br />
  23. 23. Afforestation<br />Water conservation<br />Live-stock management<br />Wise-agriculture methods<br />COUNTERING DESERTIFICATION<br />