Land degradation/Description: Difference between revisions
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All intermediate and resulting factors are expressed as dimensionless indices from zero to one, and so too is the end indicator, Water Erosion Sensitivity Index. | All intermediate and resulting factors are expressed as dimensionless indices from zero to one, and so too is the end indicator, Water Erosion Sensitivity Index. | ||
=== | ===Susceptibility and sensitivity=== | ||
The susceptibility and sensitivity indices are calculated according to: | The susceptibility and sensitivity indices are calculated according to: | ||
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with: | with: | ||
: Ia = relief index (-) | |||
: SE = soil erodibility index (-) | |||
: T = terrain erodibility index (-) | |||
: R = rainfall erosivity index (-) | |||
: Ep = water erosion susceptibility index (-) | |||
: V = land-use/land-cover index (-) | |||
: WES = Water Erosion Sensitivity Index (-) | |||
Management systems are in use around the world to reduce the risk of erosion, such as building terraces, zero tillage, planting or conserving protective vegetation zones around fields, and high capacity drainage systems. The Water Erosion Sensitivity Index cannot capture all these and other interventions for the current situation, let alone into the future. The index only indicates areas potentially under threat. Impacts on crop production and soil quality cannot be derived directly from the indicator. | |||
Comparison of the calculation above and the GLASOD degradation status maps by [[Oldeman et al., 1991|Oldeman et al. (1991)]] shows maximum correspondence with use of the classification in Table 7.5.2. This classification can be used as a guide in analysing the water erosion sensitivity indicator. | |||
{| | |||
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!Water Erosion Sensitivity Index | |||
! GLASOD soil degradation caused by water erosion | |||
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}} | }} | ||
Revision as of 12:30, 18 May 2014
Parts of Land degradation/Description
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