Sökning: "semi arid"

Visar resultat 1 - 5 av 39 avhandlingar innehållade orden semi arid.

  1. 1. Soil erosion and sedimentation in semi-arid Tanzania : studies of environmental change and ecological imbalance

    Detta är en avhandling från Uppsala : Scandinavian institute of African studies [Nordiska Afrikainstitutet]

    Författare :Carl Christiansson; [1981]

    Sammanfattning : .... LÄS MER

  2. 2. Making the Most of It? Understanding the social and productive dynamics of small farmers in semi-arid Iringa, Tanzania

    Detta är en avhandling från Department of Sociology, Lund University

    Författare :Peter Gregersen; Lund University.; Lunds universitet.; [2003]
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Social changes; Malthus; Boserup; Tanzania; semi-arid Africa; Iringa; conservation; sustainability; soil fertility; degradation; population; Matthew principle; social differentiation; farmerisation; de-peasantisation; livelihood diversification; rural change; agrarian change; agricultural change; small farmers; dynamics; theory of social work; Sociala förändringar; teorier om socialt arbete;

    Sammanfattning : While much of semi-arid Africa is still sparsely populated with unused land, there are everywhere pockets of high and increasing population density in attractive locations. Small-scale farmers can respond to beginning land-scarcity in a number of ways. LÄS MER

  3. 3. Dry spell mitigation to upgrade semi-arid rainfed agriculture Water harvesting and soil nutrient management for smallholder maize cultivation in Machakos, Kenya

    Detta är en avhandling från Stockholm : Institutionen för systemekologi

    Författare :Jennie Barron; Stockholms universitet.; [2004]
    Nyckelord :;

    Sammanfattning : Improvements in on-farm water and soil fertility management through water harvesting may prove key to up-grade smallholder farming systems in dry sub-humid and semi-arid sub-Sahara Africa (SSA). The currently experienced yield levels are usually less than 1 t ha-1, i.e. LÄS MER

  4. 4. Satellite remote sensing of primary production in semi-arid Africa

    Detta är en avhandling från Department of Physical Geography and Ecosystem Science, Lund University

    Författare :Martin Sjöström; Lund University.; Lunds universitet.; [2012]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; remote sensing; primary production; vegetation index; savanna; grassland;

    Sammanfattning : With the challenges Africa faces with respect to the predicted warming due to climate change, the continents role in the global carbon cycle has been increasingly recognized. Earth observing satellites have played a significant role in the study of vegetation, particularly in Africa where climate stations are sparse. LÄS MER

  5. 5. Modelling Transpiration and Growth of Salinity and Drought Stressed Tomatoes

    Detta är en avhandling från Stockholm : Mark och vatten

    Författare :Louise Karlberg; KTH.; [2002]
    Nyckelord :water-use efficiency; osmotic effect; ion toxicity; semi-arid;

    Sammanfattning : Irrigation with saline waters is an agricultural practicethat is becoming increasingly common as competition for freshwater increases. In this thesis the mechanisms behind salinityand drought stress has been studied using data from fieldexperiments in combination with a modelling tool, theCoupModel. LÄS MER