aridity and drought

This ppt help to understand difference between aridity and drought

1. Name : Muhammad Bilal Presentation topic: aridity, Drought and classification of drought Course Title : Agri tunnel farming Submitted to : sir Muhammad Saleem Chang Institute : Sindh Agriculture university Sub campus umerkot ( Department of Agronomy)

2. Aridity A long term Lake of water , rainfall or moisture Aridity is basically a comparison between water supply and water need. Water supply in general is the amount of water received from precipitation, while water need is measured in terms of evapotranspiration.

3. Causes of aridity Wind system Rain Temperature

4. Three arid zones can be delineated by this index: namely, Hyper-arid zone Arid zoneSemi-Arid zone Of the total land area of the world, the hyper-arid zone covers 4.2 percent.
The arid zone 14.6 percent, The semiarid zone 12.2 percent.

5. Arid zone is characterized by pastoralism and no farming except with irrigation. Lake of Available water To extent Hindering and preventing The growth and development of plant life and animal life The native vegetation is low, being comprised of annual and perennial grasses and other herbaceous vegetation.

6. Hyper arid zone Comprises dryland areas without vegetation, with the exception of a few scattered shrubs.
Annual rainfall is low, rarely exceeding 100 millimeters.
The rains are infrequent and irregular, sometimes with no rain during long periods of several years.

7. Semiarid zone The semi-arid zone
can support rain-fed agriculture with more or less sustained levels of production.
Native vegetation is represented by a variety of species, such as grasses and grass-like plants, half-shrubs, shrubs and trees.
Annual precipitation varies from 300-600 to 700-800 millimeters, with summer rains, and from 200-250 to 450-500 millimeters with winter rains.

8. Drought Drought is a prolonged dry period in the natural climate cycle that can occur anywhere in the world. It is a slow-onset disaster characterized by the lack of precipitation, resulting in a water shortage. Drought can have a serious impact on health, agriculture, economies, energy and the environment.

9. Classification of drought Hydrological Drought Hydrological drought is associated with the effect of low rain falls on water level in reservoirs, rivers and lakes . This type of drought are noticed some times after a metrology drought A hydrological drought change in water level effects ecosystem.

10. Metrological drought Is generally defined by comparing the rainfall in a particular place and at a particular time . This happnes when the actual rain fall in an area is significantly less than the climatological mean of that area . Metrological drought leads to soil moisture and this always has an effect on crops production

11. Agricultural drought Agricultural drought occurs when there is not enough water for a crop to grow at the particular time. This type of drought does not depend only in the amount of rainfalls where water is used carelessly for irrigation and other purpose