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Halophytes as a resource for livestock and for rehabilitation of degraded lands (Hardcover, Reprinted from)
Loot Price: R5,992
Discovery Miles 59 920
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Halophytes as a resource for livestock and for rehabilitation of degraded lands (Hardcover, Reprinted from)
Series: Tasks for Vegetation Science, 32
Expected to ship within 10 - 15 working days
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Desertification (land degradation in arid, semi-arid and dry
sub-humid areas resulting mainly from adverse human impacts) is the
main environmental problem of dry lands, which occupy more than 40
per cent of the total global land area. The phenomenon threatens
about 3.6 billion hectares and currently affects the livelihood of
about 900 million people. Thl! world is now losing annually about
1.5 million hectares of total irrigated lands (240 million
hectares) due mostly to salinization, mainly in drylands. Salt
affected soils are widely distributed throughout the arid and
semi-arid regions, and particularly severe in China (7 million ha),
India (20 million ha), Pakistan (3.2 million ha), USA (5.2 million
ha), as well as Near East, southern Europe and elsewhere. Demands
on production have increased the pressure on existing productive
land and moved the limits of production onto increasingly marginal
lands. Wise land-use practices have yet to be developed for such
conditions. The Executive Director of UNEP reported to the
Governing Council in February 1992 concerning the "Status of
Desertification and Implementation of the United Nations Plan of
Action to Comtat Desertification (PACD)". The Report concludes that
major efforts to implement the PACD had gJne into supporting
measures rather than concrete corrective field operations. Little
evidence of progrl!ss was found in irrigated croplands, rainfed
croplands or rangelands. It was recommended that every piece of
land should be used in keeping with its ecological characteristics,
natural capabilities and constraints.
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