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Local and national perceptions of environmental change in central Northern Namibia: Do they correspond?
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
2007 In: Journal of Arid Environments, ISSN 0140-1963, Vol. 69, no 3, 506-525 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2007. Vol. 69, no 3, 506-525 p.
Identifiers
URN: urn:nbn:se:su:diva-24161ISI: 000245349300012OAI: oai:DiVA.org:su-24161DiVA: diva2:196906
Note
Part of urn:nbn:se:su:diva-6707Available from: 2007-03-20 Created: 2007-03-02Bibliographically approved
In thesis
1. More Water, Less Grass?: An assessment of resource degradation and stakeholders’ perceptions of environmental change in Ombuga Grassland, Northern Namibia
Open this publication in new window or tab >>More Water, Less Grass?: An assessment of resource degradation and stakeholders’ perceptions of environmental change in Ombuga Grassland, Northern Namibia
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The objectives of this thesis are to assess: to what degree have natural resources deteriorated in a grazing area in northern Namibia, how do perceptions of environmental change held by local stakeholders there, correspond to scientific assessments, and how do these relate to national estimates? Analysis of the process of developing national indicators for monitoring of land degradation concluded that specific indicators should be developed on national level, and in some instances even on local level as there are no universal causes of land degradation. According to farmers overgrazing and low rainfall since the early 1990s cause negative environmental changes in the study area, partly confirming findings from national monitoring. Results also suggest that: less grazing outside the study area, improved access, permanent water supply, and fencing of large areas, also contributed. Results show that improved water supply was the most important factor. Investigation of the influence of permanent water points on grazing resources showed that perennial grasses are replaced by less palatable annual grasses as far as 6 km from water points along a water pipeline. No significant grazing induced changes in grass composition were observed around privately owned wells. Private ownership seems to be a key factor preventing over-utilization of grazing resources around the latter. A remote sensing study using Landsat TM imagery identified bare ground, saltpans and grassland with a fair accuracy. Separation of woodland from shrubland and shrubland from grassland was less accurate using supervised classification. The results show that the soil adjusted vegetation index provides valuable information about variations of green biomass over time in semi-arid environments. However, it is suggested that satellite based investigations should be supported by thorough ground based assessment due to the influence of underlying soil in this environment.

Place, publisher, year, edition, pages
Stockholm: Institutionen för naturgeografi och kvartärgeologi, 2007. 114 p.
Series
Dissertations from the Department of Physical Geography and Quaternary Geology, ISSN 1653-7211 ; 4
Keyword
Environmental monitoring, semi-arid, pastoralism, rural water supply, indicators, local knowledge, vegetation survey, satellite remote sensing
National Category
Physical Geography
Research subject
Physical Geography
Identifiers
urn:nbn:se:su:diva-6707 (URN)91-7155-381-9 (ISBN)
Public defence
2007-04-11, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 8 C, Stockholm, 13:00
Opponent
Supervisors
Available from: 2007-03-20 Created: 2007-03-02 Last updated: 2010-10-21Bibliographically approved

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