Results 251 to 260 of about 274,449 (312)
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Hydrocollapse of Semi-arid Soils
Indian Geotechnical Journal, 2015Problematic soils are those that make the construction of structures extremely difficult. They include collapsible soils which are widely distributed in North America, Europe, Russia and Asia. They show low dry density and moisture content in all testing schedule due to presence of cementation bonds or loess structure especially at unsaturated state in
Ammar Rouaiguia, Mohammed A. Dahim
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2007
Arid and semi-arid ecosystems in South America are best illustrated by two desert regions, the Peruvian and Atacama Deserts of the Pacific coast and the Monte Desert of central Argentina. The caatinga of northeast Brazil is often described as semi-arid, but mostly receives 500–750 mm of annual rainfall and is better regarded as dry savanna. Small areas
P.W. Rundel, P.E. Villagra
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Arid and semi-arid ecosystems in South America are best illustrated by two desert regions, the Peruvian and Atacama Deserts of the Pacific coast and the Monte Desert of central Argentina. The caatinga of northeast Brazil is often described as semi-arid, but mostly receives 500–750 mm of annual rainfall and is better regarded as dry savanna. Small areas
P.W. Rundel, P.E. Villagra
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Irrigation in semi-arid regions
Outlook on Agriculture, 1967A land area can be considered semi-arid if it has an annual rainfall of less than 15 inches and if the evaporation from a water surface exceeds 45 inches. Such areas, under irrigation, can be highly productive agriculturally and can also provide congenial living conditions.
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Waste biorefinery in arid/semi-arid regions
Bioresource Technology, 2016The utilization of waste biorefineries in arid/semi-arid regions is advisable due to the reduced sustainable resources in arid/semi-arid regions, e.g. fresh water and biomass. This review focuses on biomass residues available in arid/semi-arid regions, palm trees residues, seawater biomass based residues (coastal arid/semi-arid regions), and the ...
Juan-Rodrigo Bastidas-Oyanedel +5 more
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Denitrification in a semi-arid grazing ecosystem
Oecologia, 1998The effect of large herbivores on gaseous N loss from grasslands, particularly via denitrification, is poorly understood. In this study, we examined the influence of native migratory ungulates on denitrification in grasslands of Yellowstone National Park in two ways, by (1) examining the effect of artificial urine application on denitrification, and (2)
Douglas A, Frank, Peter M, Groffman
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Improving Forage Crops for Semi-Arid Areas
Outlook on Agriculture, 1998In semi-arid areas, forage crops for grazing are suitable for extensive, marginal lands because they can sustain competitive meat or milk production, they protect against soil erosion risks, and they can form the basis of an alternative sustainable agriculture.
Medrano H +3 more
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Chronic Poverty in Semi Arid Zimbabwe
SSRN Electronic Journal, 2003This paper examines the causes of chronic poverty in the remote rural areas (RRAs) of Zimbabwe's semi-arid communal lands. We found that persistent poverty was strongly associated with the structural poverty of Zimbabwe's semi-arid communal areas. Relative urban proximity (non-remoteness) assisted income diversification and improvement in a very poor ...
Kate Bird, Andrew Shepherd
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2012
Phototrophic microorganisms are mostly endolithic or hypolithic in the more extreme arid environments and are here restricted to situations where sufficient moisture is retained for occasional growth to occur. Slightly less extreme environments frequently have biological soil crusts.
Chunxiang Hu +2 more
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Phototrophic microorganisms are mostly endolithic or hypolithic in the more extreme arid environments and are here restricted to situations where sufficient moisture is retained for occasional growth to occur. Slightly less extreme environments frequently have biological soil crusts.
Chunxiang Hu +2 more
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1996
Abstract The ecology of the arid and semi-arid regions of East Africa is essentially the ecology of subsistence pastoralism. Pastoralists and their herds are ubiquitous in the drier parts of East Africa. Pastoralists need these areas for their survival and, in tum, significantly affect them.
David M Swift +2 more
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Abstract The ecology of the arid and semi-arid regions of East Africa is essentially the ecology of subsistence pastoralism. Pastoralists and their herds are ubiquitous in the drier parts of East Africa. Pastoralists need these areas for their survival and, in tum, significantly affect them.
David M Swift +2 more
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Arid and Semi-Arid Geomorphology
2013Based on four decades of research by Professor Andrew Goudie, this volume provides a state-of-the-art synthesis of our understanding of desert geomorphology. It presents a truly international perspective, with examples from all over the world. Extensively referenced and illustrated, it covers such topics as the importance of past climatic changes, the ...
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