• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

'Analyse the measurements of desertification'

Extracts from this document...


6 (ii) 'Analyse the measurements of desertification' "Drought and desertification threaten the livelihood of over one billion people in more than 110 countries" warned general Kofi in 2001 (Kovach,2003). Desertifications definition is highly disputed but it is generally the shift of arid or semi-arid regions to desert-like conditions, which support: little vegetation, a low soil fertility and high evaporation rates (Haggett, 2001). This work will overlook how deserts are measured by a variety of different means. To measure the growth of deserts characteristics need to be obtained. By creating set indicators for deserts the spread of desertification can be gauged. Climate (Anderson,2001) is one of the larger indicators of the spread of deserts: as you can see from appendix 1B, the worlds deserts are in general located in and around the equatorial region and the tropics. ...read more.


roots and nutrient cycles (Sharma,1997). National monthly rainfall index (NMRI) (UN) is used to measure monthly changes in precipiatation, weighjted against the yearly averages (UN, 2004). Also the local flora and fauna act as indicators of desertification: vegetation cover allows biologists to define weather the areas flora is decreasing in number (UN,2004) and thus potentially allowing for land degradation to set in (the forerunner to desertification). Also the types of vegetation in potential risk areas is important: the appearance of xerophytes indicates that there is little groundwater, also the appearance of halophytes would indicate higher than average soil salinity and perhaps the onset of soil salinisation (Saouma, 1993) ...read more.


Word count: 489 Saouma, E. (1993), Sustainable development of drylands and combating desertification, http://www.fao.org/documents/show_cdr.asp?url_file=/docrep/v0265e/V0265E02.htm Friedman, S. M. & Friedman, K. A. (1994), Desertification backgrounder, http://www.lehigh.edu/~kaf3/books/reporting/desert.html Anderson P, Gaseb N, Hoffman T and Klintenberg p. (2001) A3. From Community Perceptions to Remote Sensing: Methodologies Used for the Assessment of Desertification in Southern Africa, http://www.drfn.org/des2002/module3.html. Sharma K. D. (1997) The hydrological indicators of desertification, Journal of Arid Environments, 121-132, http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6WH9-45J560X-2G-1&_cdi=6845&_user=122866&_orig=browse&_coverDate=06%2F30%2F1998&_sk=999609997&view=c&wchp=dGLbVlz-zSkzV&md5=7d34d4ad0bd36d0a9c7db80a26e152db&ie=/sdarticle.pdf Pullen, S. (2004) The Desert biome, http://www.ucmp.berkeley.edu/glossary/gloss5/biome/deserts.html Carstanjen, H (1992) Managing fragile ecosystems: combating desertification and drought, http://www.unccd.entico.com/english/chapter12.htm#d Division for sustainable devt. (UN) (2004) Managing fragile ecosystems: combating desertification and drought - Indicators, http://www.un.org/esa/sustdev/natlinfo/indicators/indisd/english/chapt12e.htm Berrahmouni, N and Burgess N. (2001) Sahara desert, http://www.worldwildlife.org/wildworld/profiles/terrestrial/pa/pa1327_full.html Kovach, K and McGuire B (2003) Guide to Global Hazards, Philips, London Haggett, P (2001), Geography - A Global Synthesis, Prentice hall ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Atmosphere & Weathering section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Atmosphere & Weathering essays

  1. Marked by a teacher

    Discuss the relative importance of physical and human factors in accounting for changes to ...

    5 star(s)

    After approximately 8-10, grass increases as soil enrichment continues. Smaller grass species such as meadow grass is replaced by taller species. One invader in particular occurs in this stage which is the Japanese knotwood. Which can grow up to 3 metres in height and shade out most plants beneath them due to a dense canopy.

  2. Peri-glacial areas

    Secondly, permafrost is easily disrupted, as heat from buildings and pipelines and changes in the vegetation cover rapidly destroy it, which may cause subsidence. Of all the cold regions it is probably in the tundra zones that most impact of man is seen.

  1. The aim of this project was to investigate what differences exist in temperatures in ...

    In my experiment, I was taking temperatures over a north - south transect of the Portsmouth island. I predicted that the coolest area was going to be that nearest the sea, and the results clearly show that this is the case.

  2. Is there a relationship between the frequency of natural hazards and climate change?

    there was probably just as many hurricanes are there are today, albeit slightly more due to global warming but they simply were not recorded for a variety of reasons ranging from total ignorance to the hazard, to conflicting reports about that problem.

  1. Acid rain study

    This shows that sulphur dioxide is major hazard to our environment and most of it is man-made.

  2. Climate in different cities around the world

    Health Due to the heat, there are a lot of mosquitoes in Brazil; they carry diseases such as malaria and Yellow Fever. It is advised to always wear insect repellent. Because of the extreme temperature in Brazil, it is also advised to constantly apply sunscreen throughout the day to prevent sunburn or sun stroke.


    This is usually due, as in the Sahel, to increase population pressure which increases the demand for food and so pressure on the farmers to produce more. Forests and wood land is cleared for a variety of purposes, to create agricultural and pasture land for example, but it might be

  2. Distinguish between the processes of erosion and weathering in an area undergoing glaciation.

    Aviemore is one of the largest winter tourism centres in Britain with several ski runs on the upper slopes of the Cairngorms. Communications are also affected by glacially eroded landforms. Glaciated valleys offer natural routeways through high mountain landscapes and lower areas e.g.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work