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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
201

Quantifying indigenous forest change in Dukuduku from 1960 to 2008 using GIS and remote sensing techniques to support sustainable forest management planning

Ndlovu, Nomzamo Bonisiwe 12 1900 (has links)
Thesis (MSc)--Stellenbosch University, 2013. / ENGLISH ABSTRACT: This study aimed to understand how Dukuduku Forest in Kwa-Zulu Natal has changed from 1960 to 2008 and whether the change in political regimes, during and post apartheid eras might have contributed to changes in forest extent. To achieve the aims, the following analyses were made: - Qualitative and quantitative spatial analyses of forest change; - Analyses of the correspondence of change with political changes in the country; - Assessment of perception of people living in the Dukuduku forest area. The Dukuduku land cover was mapped from aerial photos using ArcGIS 9.3 to determine whether or not there has been a significant change in the area from 1960-2008, in response to resource use pressures and to come up with the strategic sustainable management plan from the results found. Five aerial photographs were used to determine the changes in land cover from the year: 1960, 1970, 1992, 2005 and 2008. The Land cover types were classified into four classes, Indigenous Forests, Plantation Forests, Water Bodies and Other (open areas, cultivated land, and all the human disturbed and transformed land). The percentage of cover per class was compared across the years to determine overall change in land cover and the rate of change per year was also calculated. The results from the study showed that: - Natural Forest increased by 11% (700 ha), at the rate of 20.56 hectares per year between 1960 and 1992, which is the apartheid era. Between 1992 and 2008, the democratic era, the forest decreased by 34.4% (2472.31ha), at the rate of 168 hectares per year. - The Dukuduku forest community gains resources (timber and grass for construction, art, firewood, medicinal plants, grazing of livestock and food) from the forest. The people are willing to contribute in protecting the forest only if the governing authorities would include them in decisions made, as the NFA demands Participatory Forest Management, but which does not currently exist in Dukuduku. / AFRIKAANSE OPSOMMING: Hierdie studie ondersoek die verandering van die Dukuduku woud in Kwa-Zulu Natal vanaf 1960 tot 2008, en vernaamlik of die verandering in politieke regimes tydens en in die postapartheid eras tot verandering bygedra het in die woud se vorm. Om hierdie doelwitte te breik is die volgende analises gedoen: - Kwalitatiewe en kwantitatiewe ruimtelike analises van woudverandering; - Analises van die korrelasie tussen hierdie fisiese omgewingsverandering en politieke verandering in die land; - Analise van die persepsie van mense wat in die Dukuduku woudgebied woon. Die Dukuduku gronddekking is gekarteer met behulp van lugfotos, waarvoor ArcGIS 9.3 gebruik is om te bepaal of daar noemenswaardige verandering in die gebied plaasgevind het van 1960 tot 2008, in reaksie op hulpbrongebruike, en om ‘n volhoubare bestuursplan gestel voor wat op die bevindinge gebaseer is. Vyf lugfotos is gebruik om verandering in gronddekking te bepaal vir die jare: 1960, 1970, 1992, 2005 en 2008. Die Gronddekking tipes is geklassifiseer in vier klasse naamlik Inheemse Woude, Plantasiebosse, Waterliggame en Ander (oop gebiede, landerye en al die mens-versteurde en getransfomeerde gebiede). Die persentasie van elke dekkingsklas is oor die jare vergelyk om die verandering in algehele grond-dekking te bepaal, en die tempo van verandering is ook bepaal, asook die tempo van verandering. Die resultate van die studie wys dat: - Die natuurlike woud toegeneem het met 11% (700 ha), teen ‘n tempo van 20.56 hektaar per jaar tussen 1960 en 1992, tgedurende die apartheidsera. Tussen 1992 en 2008, die demokratiese era, het die woude verminder met 34.4% (2472.31 ha), teen ‘n tempo van 168 hektaar per jaar. - Die gemeenskap wat in die Dukuduku woud woon verkry hulpbronne van die woud (hout en gras vir konstruksie, kuns, brandhout, medisinale plante, weiding vir vee, en voedsel). Die mense is gewillig om by te dra tot beskerming van die woud indien die owerhede hulle sou betrek in besluite wat geneem word, veral omdat die nasionale Wet op Bosse voorsiening maak vir Deelnemende Bosbestuur, wat tans nie by Dukuduku gebeur nie.
202

The use of remote sensing and GIS in the identification and vulnerability detection of coastal erosion as a hazard in False Bay, South Africa

Callaghan, Kerry Lee 04 1900 (has links)
Thesis (MSc)--Stellenbosch University, 2014. / ENGLISH ABSTRACT: Coastal erosion is a worldwide hazard of which the consequences can only be mitigated via thorough and efficient monitoring of erosion and vulnerability to erosion. This study aimed to establish the accuracy, efficacy and efficiency of various remote sensing techniques for the detection and monitoring of coastal erosion and vulnerability occurring in False Bay, South Africa. There is a need to monitor the erosion in this area as well as to determine the most effective techniques for monitoring the erosion in False Bay and other similar environments in the future. This study provides an assessment of the usefulness of different data sources and techniques for change detection in the coastal environment. The data sources used were Landsat TM/ETM+ imagery and aerial photographs. Image differencing, tasselled cap transformations, vegetation index differencing, Boolean change detection, and post-classification change detection were all performed on the Landsat imagery. The aerial photographs were assessed using the Digital Shoreline Analysis System (DSAS) add-on for ArcGIS which determines statistical differences in the shoreline position as digitised in vector format. The results showed that while the resolution of the Landsat imagery was not sufficient to analyse erosion along the beach itself, the larger area covered by the satellite images enabled vulnerability indicators to be seen. Notably, the post-classification change detection indicated consistent increases in built-up areas, while sand dune, beach, and sand (not beach) all decreased. NDVI differencing showed consistent decreases in NDVI indicating decreasing plant health and density. The results of image differencing with both band 4 and the brightness band led to conclusions that vegetation health was decreasing while reflective surfaces such as bare sand and roads were increasing. All of these indicate an increased vulnerability to coastal erosion. The Boolean change detection method was found not to be useful in this case. Aerial photographs were studied on four focus areas: Bayview Heights, Macassar Beach, Strand, and Pringle Bay. The results showed erosion at all four areas, with Strand experiencing only erosion (no accretion) at an average of 53 cm erosion per year. Erosion at Macassar Beach and Pringle Bay was also severe, with Bayview Heights being the least severe and showing a combination of erosion and accretion. The higher resolution available on the aerial photographs was vital to view changes on the beach itself. In future studies requiring assessment of changes in the position or condition of the beach itself, aerial photographs or high resolution satellite data should be used. Studies of vulnerability extending over the entire coastal zone may make use of Landsat TM images. Post-classification change detection provides powerful change direction information and can indicate the percentage of area change from one class to another. However, image differencing and vegetation index differencing are much faster to perform and can provide information about general trends in the changes occurring. Therefore post-classification change detection might be used in areas of high and rapid change while image differencing and vegetation index differencing can be useful to cover vast areas where little change is expected. / AFRIKAANSE OPSOMMING: Kus-erosie is ‘n wêreldwye gevaar waarvan die gevolge slegs deur deeglike en doeltreffende monitering van erosie en kwesbaarheid vir erosie verminder kan word. Hierdie studie poog om die akkuraatheid, doeltreffendheid en effektiwiteit van verskillende afstandswaarneming tegnieke vas te stel vir die opsporing en monitering van kus-erosie en kwesbaarheid in Valsbaai, Suid Afrika. Daar is ‘n behoefte aan die monitering van erosie in hierdie area, sowel as om die mees doeltreffende tegnieke van die monitering hiervan in Valsbaai en ander soortgelyke omgewings in die toekoms te bepaal. Hierdie studie bied ‘n evaluering van die nut van verskillende data-bronne en tegnieke vir die opsporing van verandering in ‘n kusomgewing. Die data-bronne wat gebruik is, is Landsat TM/ETM+ beelde asook lugfoto’s. Beeld differensievorming, “tasselled cap” transformasies, plantegroei indeks differensievorming, Boolse verandering en post-klassifikasie verandering is toegepas op die Landsat beelde. Die lugfotos is ge-evalueer deur die Digitale Kuslyn Analise Stelsel (Digital Shoreline Analysis System – DSAS). DSAS is ‘n bykomstige sagteware vir ArcGIS wat statistiese verskille in gedigitaliseerde kuslyn posisie bepaal. Die resultate toon dat terwyl die resolusie van die Landsat beelde nie voldoende was om strand-erosie self te analiseer, die groter area wat deur die satellietbeelde gedek word toegelaat het om kwesbaarheid aanwysers te ontleed. Spesifiek die post-klassifikasie verandering het aangedui dat konsekwente toenames in beboude areas voorkom, terwyl afnames in sandduine, strand en sand-areas voorgekom het. NDVI differensievorming het konsekwente afnames in NDVI getoon, wat dui op afnames in die gesondheid en digtheid van plantegroei. Die resultate van die beeld differensievorming met beide Landsat Band 4 en die helderheid-band het gelei tot die gevolgtrekking dat die gesondheid van plantegroei afgeneem het, terwyl reflektiewe oppervlaktes soos oop sand en paaie aan die toeneem is. Al hierdie resultate dui op die verhoogde kwesbaarheid vir kus erosie. Die Boolse verandering metode is bevind om nie van nut te wees in hierdie geval nie. Lugfoto’s van vier fokus-areas is bestudeer: Bayview Heights, Macassar Strand, Strand en Pringlebaai. Resultate van die DSAS analise het gevind dat oorwegend erosie by al vier areas plaasvind, met Strand die enigste area wat slegs erosie (geen aanwas) ervaar teen ‘n gemiddelde koers van 0.53 m per jaar. Erosie by Macassar Strand en Pringlebaai was ook ernstig, terwyl Bayview Heights die minste erosie ervaar het, met ‘n kombinasie van erosie en aanwas. Die hoër resolusie beskikbaar deur die lugfoto’s was noodsaaklik om veranderinge in strand areas waar te neem. In toekomstige studies wat die assessering van verandering in die posisie of toestand van strande noodsaak behoort lugfotos of hoë-resolusie satellietbeeld data gebruik te word. Studies oor die kwesbaarheid van ‘n hele kusstreek kan wel gebruik maak van Landsat data. Post-klassifikasie verandering bied kragtige informasie oor die rigting van verandering en kan die persentasie van verandering van een klas na ‘n ander aandui. Beeld en NDVI differensievorming is egter veel vinniger om uit te voer en kan informasie rakende die algemene tendense in verandering lewer. Post-klassifikasie verandering kan dus gebruik word in gebiede van vinnige en beduidende verandering plaasvind, terwyl beeld en NDVI differensievorming nuttig kan wees om groot areas te dek waar min verandering verwag word.
203

A review of land reform in the Matzikama municipal area

Potgieter, Rese 12 1900 (has links)
Thesis (MA)--Stellenbosch University, 2014. / ENGLISH ABSTRACT: Land reform is a vital political issue that has been fiercely debated in recent years, especially in South Africa. With the historical background of South Africa consisting of colonialism and political resistance that resulted in racial discrimination, apartheid was forced onto the black citizens by the white government. To correct the injustices of the apartheid regime, the new democratic government had to find a way to redistribute land that was previously owned by citizens previously disposed of their land. The South African government uses land reform to address the social, political and economic issues that this newly democratic country face; however, it has not been implemented very well to date. The aim of this study was to determine the perceptions on the progress and implementation of land reform in the Matzikama Municipality of South Africa. With different stakeholders’ perceptions to be taken into consideration, this study focused on three aspects: (1) the perceptions of commercial farmers in the Matzikama Municipality; (2) the progress of Equity Share Scheme (ESS) projects in the Matzikama Municipality; and (3) the perceptions of the key role players on land reform. The study focused on the commercial farmer members of the Vredendal famers’ association and members of the ESS projects in close proximity to Vredendal. The research objectives of this study were sixfold, namely (1) to examine the literature on land reform to establish an understanding of what land reform is about, what overall objectives it has, what types and approaches exist and how it has been implemented internationally; (2) to investigate policies, legislation and the land reform programme of South Africa and how it has been implemented nationally; (3) to identify the perceptions of the commercial farmers in the Matzikama municipal area on land reform; (4) to determine how successful or unsuccessful land reform projects have been in the Matzikama municipal area by investigating farms that have incorporated it; (5) to identify the perceptions that key role players have on land reform and to use these perceptions to assess the current state of the land reform programme in the study area; and (6) to identify the problems that the land reform programme is experiencing and to make recommendations on how to improve the current state of land reform. The necessary data was collected through a questionnaire survey among commercial farmers and conducting interviews with beneficiaries of ESS projects and key role-players. The data was then analysed by making use of Statistical Package for the Social Sciences (SPSS) and Microsoft Excel. The findings indicate that the commercial farmers have a very negative perception of land reform, the main reason being that they felt the government was targeting white commercial farmers, and some respondents indicated that they felt insecure about land security. As for ESS projects in the Matzikama Municipality, the projects have not being very successful, although the Alfalfa land reform project is still trying to uplift its shareholders. From the data collected from the interviews conducted with the key role players, five problems were identified relating to the current implementation of the land reform programme in the study area in general: (1) the incoherence of the current policy-making approach and the massive gaps between national and local stakeholders in the current decision-making approach; (2) the slow acquisition process for agricultural land due to cumbersome bureaucracy; (3) the lack of partnership and integration between government departments, the private sector and beneficiaries; (4) the lack of government support, which has contributed to the poor success rate of land reform projects; and (5) the beneficiaries’ inexperience and lack of skills concerning farming. To address the problems identified with the current implementation of the land reform programme in South Africa, it is recommended that the government reassesses the approach it has been using to try to redistribute agricultural land. This can be done by ensuring that officials dealing with land reform have the necessary skills and experience to implement the strategies. The government should also consider a grassroots approach when identifying land for redistribution by making use of local communities. Funding from the government is also crucial and should be allocated appropriately. Lastly, the government should invest in programmes that focus on educating emerging farmers on managing a commercial farm successfully. / AFRIKKANSE OPSOMMING: Grondhervorming is 'n belangrike politieke kwessie waaroor daar die afgelope paar jaar heftig gedebatteer word, veral in Suid-Afrika. Met die geskiedkundige agtergrond van Suid-Afrika, bestaande uit kolonialisme en politieke weerstand wat gelei het tot rasse diskriminasie, is apartheid deur die wit regering afgedwing op swart burgers. Om die ongeregtighede van apartheid reg te stel, moes die nuwe demokratiese regering 'n manier vind om grond te herverdeel aan die voorheen benadeelde burgers wat voor apartheid die grond besit het. Die Suid-Afrikaanse regering gebruik grondhervorming om die sosiale, politieke en ekonomiese kwessies wat hierdie nuwe demokratiese land in die gesig staar, aan te spreek, maar dit word nie so goed geïmplementeer as wat die voorheen benadeelde burgers verwag het nie. Die doel van hierdie studie was om die persepsies oor die vordering met en implementering van die grondhervormingsprogram in die Matzikama Munisipaliteit van Suid-Afrika te bepaal. Met verskillende belanghebbendes se persepsies wat in ag geneem moet word, het hierdie studie gefokus op drie standpunte: (1) die persepsies van kommersiële boere in die Matzikama Munisipaliteit; (2) die vordering van Gedeelde-eienaarskapskema (ESS – Equity Share Scheme) projekte in die Matzikama Munisipaliteit, en (3) die sleutel rolspelers se persepsie oor grondhervorming. Die studie het gefokus op die kommersiële boere wat lid was van die Vredendal Boerevereniging en lede van die AWS projekte in die nabyheid van Vredendal. Daar was ses doelwitte vir hierdie studie, naamlik (1) om die literatuur oor grondhervorming te ondersoek om 'n begrip te bekom van wat grondhervorming is, watter algemene doelstellings dit het, watter tipe grondhervormng en benaderings bestaan, en om vas te stel hoe grondhervorming op ’n internasionale vlak geïmplementeer word; (2) om ondersoek in te stel oor die beleide, wetgewing en grondhervormingsprogram van Suid-Afrika en hoe dit op die nasionale vlak geïmplementeer word; (3) om die persepsies van die kommersiële boere in die Matzikama Munisipale gebied oor grondhervorming te identifiseer; (4) om te bepaal hoe suksesvol of onsuksesvol grondhervormingsprojekte in die Matzikama Munisipale area is deur ondersoek in te stel op plase wat AWS projekte begin het, (5) die persepsies wat belangrike rolspelers oor grondhervorming het, te identifiseer en hierdie persepsies te gebruik om die huidige toestand van die grondhervormingsprogram in Suid-Afrika te bepaal, en (6) die probleme wat die grondhervormingsprogram ondervind te identifiseer en aanbevelings te maak oor hoe om die huidige stand van grondhervorming in Suid-Afrika te verbeter. Deur die verspreiding van vraelyste onder die kommersiële boere en deur onderhoude met begunstigdes van AWS projekte en sleutel rolspelers te voer, is die noodsaaklike data ingesamel, waarna dit ontleed is deur gebruik te maak van die Statistical Package for the Social Sciences (SPSS) en Microsoft Excel. Daar is bevind dat die kommersiële boere ’n baie negatiewe persepsie oor grondhervorming het. Die hoof rede hiervoor is dat hulle voel die regering teiken wit kommersiële boere en sommige respondente het aangedui dat hulle onseker voel oor grondsekuriteit. Die AWS-projekte was nog nie regtig suksesvol in die Matzikama Munisipaliteit nie, maar die Alfalfa grondhervormingsprojek bestaan nog en probeer om die aandeelhouers op te hef. Uit die data wat deur die onderhoude met die sleutel rolspelers versamel is, is vyf probleme met die huidige implementering van die grondhervormingsprogram van Suid-Afrika geïdentifiseer: (1) die onsamehangendheid van die huidige benadering tot beleidskepping en die massiewe gapings tussen die nasionale en plaaslike belanghebbendes wat die huidige besluitnemingsbenadering aanbetref, (2) die stadige verkrygingsproses van landbougrond weens omslagtige burokrasie; (3) die gebrek aan vennootskappe en integrasie tussen regeringsdepartemente, die private sektor en die begunstigdes van grondhervorming; (4) die gebrek aan ondersteun van die regering, wat bydra tot die swak slaagsyfer van grondhervormingsprojekte, en (5) die gebrek aan begunstigdes met ervaring en vaardighede met betrekking tot die landbou. Om die probleme met die huidige implementering van die grondhervormingsprogram in Suid-Afrika aan te spreek, word dit aanbeveel dat die regering die benadering wat hulle gebruik om doe herverdeling van landbougrond te finaliseer, herevalueer. Dit kan gedoen word deur te verseker dat amptenare wat met grondhervorming werk die noodsaaklike vaardighede en ondervinding het om die nodige strategieë te implementeer. Die regering moet ook oorweeg om met behulp van die plaaslike gemeentskap grond te indentifiseer wat beskikbaar is vir herverdeling. Befondsing van die regering is ook van kardinale belang en moet toepaslik toegeken word. Laastens moet die regering belê in programme wat fokus op die opvoeding van opkomende boere wat hulle kan in staat stel om ’n suksesvolle kommersiële boere te word.
204

Food environments in Islamabad, Pakistan

Hasnain, Saher January 2016 (has links)
This dissertation examines how concerns about food system transformations affect how middle class consumers in Islamabad, Pakistan, perceive and approach food consumption in their everyday lives. The dissertation is situated in the context of risky food environments and food fears resulting from intensified, industrialised, and increasingly lengthened global food systems. Working within food geography and food environments paradigms, this dissertation explores how the transformation of food systems is associated with increasing anxiety about food security and safety for middle class urban consumers in Islamabad. Qualitative data gathered from semi-structured interviews and participant observation is used to illustrate the effects external influences, such as energy scarcity and violent events, have on everyday food environments. The dissertation examines the ways in which conceptualisations of 'good food', and trust relationships are negotiated in these dynamic food environments. The intensely geographical nature of these food environments and food systems, and the role of place-specific contexts on perceptions and adaptations related to food anxieties are emphasised. Situated in literatures on food anxiety and food consumption emerging from geography, food studies, and anthropology, this dissertation challenges dominant discourses on alternative and ethical consumption in a globalising food system. The results of this research not only contribute to literature on South Asia, but also contribute to consumption practices of a burgeoning middle class in developing countries.
205

GIS-based land suitability assessment and allocation decision-making in a degraded rural environmen

Breytenbach, Andre 10 1900 (has links)
Thesis (MSc)--University of Stellenbosch, 2006. / ENGLISH ABSTRACT: Rural development problems faced by the impoverished communities in the Transkei, South Africa, are numerous, and environmental degradation has already taken much of its toll. By working at a micro-catchment-level both the socio-economic and biophysical appreciation of the land resources were captured as encapsulated in the concept of resource management domains. Participatory decision-making allowed functional land use goals and evaluation criteria to be incorporated into computerised multi-criteria evaluation and multi-objective land use allocation models in order to reach an idealised or more sustainable land use situation. In the execution of the decision-making process seven procedural steps were followed, which are discussed in detail and applied in the case study. Synthesis of the results emphasised the envisaged rural planning potential of the methods used. / AFRIKAANSE OPSOMMING: In terme van plattelandse ontwikkeling staar talle probleme die behoeftige gemeenskappe van Transkei, Suid-Afrika, in die gesig en omgewingsdegradering neem ongehinderd sy tol. Deur op ‘n mikro-opvangsgebied vlak te werk kon beide die sosio-ekonomiese en biofisiese waarde van die gebied se hulpbronne bepaal word en uitgebeeld word in hulpbron bestuursdomeine. Deur deelnemende besluitneming is funksionele grondgebruiksdoelwitte en evaluasie kriteria gebruik in gerekenariseerde meervoudige kriteria evaluering en veeldoelige grondgebruiksaanwysingsmodelle ten einde die ideale of ‘n meer volhoubare grondgebruik situasie te verkry. Vir die uitvoering van die besluitnemingsproses is van sewe opeenvolgende stappe gebruik gemaak en die uitvoering daarvan word in diepte bespreek in hierdie gevallestudie. Sintese van die resultate het die potensiaal van hierdie beoogde landelike beplanningsmetodes beklemtoon.
206

Local and sub-regional socio-economic and environmental impact of large-scale resort development

Van der Merwe, Schalk Willem Jacobus 12 1900 (has links)
Thesis (MA (Geography and Environmental Studies))--University of Stellenbosch, 2006. / The problem addressed in this research is that large-scale estate developments in the Western Cape generally have, up to now, apparently not fulfilled their potential as primary economic drivers, thus, failing to contribute in a significant manner to addressing the primary challenges facing the present-day South Africa, namely poverty, inequality, and environmental degradation. This research focused on the recently-formulated project-based Sustainable Development Initiative (SDI) approach as a strategy to optimally unlock the potential benefits of largescale development as a primary economic driver. In the research, the potential of the SDI approach in this regard was tested by comparing the envisaged performance of an SDI to be implemented in the Hoogekraal area near George in the South Cape with the performance of five selected large-scale estate developments that have been planned and developed in terms of the ‘conventional’ approach as it was defined for this research. The over-arching purpose of the research was to determine whether the project-based SDI approach, as demonstrated by the pre-development condition of the proposed Hoogekraal SDI, could make a meaningful contribution to the alleviation of poverty, inequality and environmental degradation and whether it presents an improvement in this regard on the ‘conventional’ planning, implementation and management approach for large-scale estate developments. The SDI approach, in its current, conceptual format, does not profess to be flawless. The research has left a number of questions unanswered pertaining to, in particular, the mobilisation, involvement, and required participation capacity of the communities that would be affected by an SDI. The research has indicated that the proponents of the SDI approach still have a long way to go to bridge the divergent views and evident opposition against large-scale estate development of conservation-orientated NGOs and community groups, and factions within government departments. However, the research has indicated that the SDI approach holds the promise to be an innovative strategy through which the benefits of large-scale development could be optimised for both people and the environment. The SDI approach, at least, represents an honest response to the national goals for sustainable development put forward in, amongst others, the South African Constitution. It is therefore concluded that there is merit in the claim of the SDI proponents that the SDI approach to large-scale development presents, to a larger extent than the ‘conventional’ approach, a mechanism through which this development typology can contribute to the eradication of poverty, inequality and environmental rehabilitation in partnership with local communities and other stakeholders. It is believed that this research can contribute as: a) an input in the drafting of regional and municipal development policy aimed at promoting sustainable development, for example, the spatial development frameworks prepared by municipalities in terms of the Local Government Municipal Systems Act 32 of 2000 (South Africa 2000); b) a basis for the planning and implementation of large-scale estate developments in a manner that would, on balance, improve the state of any given condition in a sustainable, integrated, holistic and practical manner and in partnership with those who would be affected by the developments and those who support the ethos of sustainable development; and c) a basis for further research pertaining to the implementation and long-term management of the SDI approach at the project level, the objective being to promote the continual improvement of the approach.
207

Land degradation in Mhondoro (Zimbabwe) : an environmental assessment of communal land uses and resource management practice

Tichagwa, Cornelius Gibson 04 1900 (has links)
Thesis (MA)--Stellenbosch University, 2002. / ENGLISH ABSTRACT: When land loses its intrinsic qualities or suffers a decline in its capabilities it is said to be degraded. Land degradation manifests itself in various forms such as deforestation, soil erosion, land, air and water pollution. In the context of sustainable development land degradation has become one of the world's major concerns. Now, more than ever before, it has become urgent to carry out empirical studies on the nature and extent of land degradation and to come up with appropriate responses to the problem. In much of the developing world communal natural resource management practices are common. It is often assumed that communal exploitation of common property resources such as woodlands, pastures, water sources and wildlife inevitably leads to land degradation. This is due to the belief that humankind would seek to derive maximum benefit from common pool resources without incurring any costs towards the conservation of those resources. This study was an environmental assessment of the impacts of communal land-use systems and common property resources management practices in the Mhondoro communal lands of Zimbabwe. The area has been subject to human settlement for over a century and is regarded as a typical representation of a well-established communal land management system. Several methods were used to make the assessment. These included the following: a questionnaire survey; interviews with key informants; soil and vegetation traverses and field measurements; tree density counts in demarcated plots; calculation of the population density and livestock density for the study area; completion of an environmental evaluation matrix and a communal projects sustainability index checklist; and analysis of geo-referenced time-lapse aerial photography covering a fifteen year period (1982-1997). It was established that serious land degradation had occurred in Chief Mashayamombe's ward in Mhondoro. Degradation manifested itself in the form of soil erosion and stream sedimentation, woodland depletion, pasture degradation and wildlife habitat destruction. Communal land-use and natural resource management practices are only partially to blame for this state of affairs. The fragile nature of the sandy soils of the uplands, the sadie soils of the vlei areas, combined with the fairly high rainfall amounts (annual average 750mm) make the area prone to soil erosion. Rainfall intensity tends to be high in the area and when the rain falls on the poorly vegetated, and highly erodible soils erosion occurs. The land has become severely stressed due to over-utilisation; a population density of 93 people per km2 and livestock density of 110 cattle per km2 were recorded. The land available for communal settlement in the area has been limited in extent. Due to the general poverty of the communal farmers the replacement of nutrients into the cultivated soil has not kept pace with the deteriorating condition of the land. Contrary to popular misconceptions, communal area residents have shown concern for environmental conservation through fallowing their fields, gully reclamation efforts, grazing schemes, woodland preservation and tree growing practices. Remedial and/or mitigatory measures for the environmental recovery of the area could adopt some of these well-established practices and incorporate them in a whole-catchment management strategy. Key words Land degradation, environmental degradation, pollution, environmental assessment, common property resources, communal land uses, sustainable resources management, sustainability indicators, soil erodibility, soil erosivity / AFRIKAANSE OPSOMMING: Wanneer grond sy intrinsieke waarde verloor of 'n afname in sy vermoë toon, kan gesê word dat die grond gedegradeer is. Gronddegradasie manifesteer in verskeie vorme, soos ontbossing, gronderosie, grond, lug en water besoedeling. Gronddegradasie het binne die konteks van volhoubare ontwikkeling wêreldwyd van besondere belang geword. Nou, meer as ooit vantevore, is dit noodsaaklik om empiriese studies uit te voer aangaande die aard en omvang van gronddegradasie, en om vorendag te kom met toepaslike reaksies tot die probleem. Gemeenskaps natuurlike hulpbron bestuur praktyke is algemeen in die ontwikkelende wêreld. Daar word dikwels veronderstel dat uitbuiting van gemeenskaplike eiendoms hulpbronne deur die gemeenskap, soos woude, weivelde, waterbronne en wild, onvermeidelik lei na gronddegradasie. Hierdie aanname het ontwikkel as gevolg van die oortuiging dat die mensdom daarna sal streef om maksimum voordeel te trek uit gemeenskaplike hulpbronne, sonder om enige koste aan te gaan ten opsigte van die bewaring daarvan. Hierdie studie behels 'n omgewings evaluering van die impakte van gemeenskaps grondgebruik sisteme en gemeenskaplike eiendoms hulpbron bestuur praktyke in die Mhondoro gemeenskaplike grond van Zimbabwe. Die area word al vir meer as 'n eeu deur mense bewoon, en word beskou as 'n tipiese voorbeeld van 'n gevestigde gemeenskaps grondbestuur sisteem. Verskeie metodes is toegepas met die evaluering, en sluit in: 'n vraelys opname; onderhoude met sleutel segspersone; grond en plantegroei opnames en veldopnames; boom digtheidstelling in afgebakende persele; berekening van bevolkingsen veedigtheid vir die studiegebied; opstelling van 'n omgewing evaluerings matriks en 'n gemeenskap projek volhoubaarheids indeks kontroleerlys; en 'n analise van geo-referenced time-lapse lugfoto's wat strek oor 'n tydperk van 15 jaar (1982-1997). Daar is vasgestel dat ernstige gronddegradasie voorkom in Hoofman Mashayamombe se wyk in Mhondoro. Degradasie word gemanifesteer in die vorm van gronderosie en stroom sedimentasie, uitputting van woude, weiveld degradasie en die verwoesting van wild habitatte. Gemeenskaps grondgebruik en natuurlike hulpbron bestuurspraktyke is net gedeeltelik verantwoordelik vir die stand van sake. Gronderosie vind plaas ook as gevolg van die sensitiewe aard van die sanderige grond van die hoogland, die sodic grond van die vlei areas, in kombinasie met redelike hoë reënval (gemiddeld 750mm per jaar). Reënval intensiteit in die area is geneig om hoog te wees, en erosie vind plaas wanneer reën val op die hoogs erodeerbare grond wat met yl plantegroei bedek is. Die grond verkeer onder geweldige druk as gevolg van oorbenutting; 'n bevolkingsdigtheid van 93 mense per km2 en veedigtheid van 110beeste per km2 is aangeteken. Die grond beskikbaar vir vestiging van gemeenskappe word in omvang beperk. Die vervanging van grondvoedingstowwe in bewerkte grond hou nie tred met die agteruitgang in die kondisie van die grond nie, as gevolg van die algemene armoede van die gemeenskapsboere. Inwoners van die gemeenskapsarea , teenstrydig met algemene wanopvattings, toon besorgdheid ten opsigte van omgewingsbewaring deur die grond braak te lê, donga herwinnings pogings, wei velds planne, bewaring van woude en praktyke ten opsigte van die groei van bome. Remediërende en/of versagtende maatstawwe vir die herstel van die omgewing kan van hierdie gevestigde praktyke inkorporeer in 'n bestuursstrategie wat die hele opvangsgebied insluit. Sleutelwoorde Gronddegradasi e, omgewingsde gradasi e, besoedeling, omgewingsassessering, gemeenskaplike eiendoms hulpbronne, gemeenskaplike grondgebruik, volhoubare hulpbron bestuur, volhoubaarheids aanwysers, grond erodeerbaarheid, grond verwering.

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