The influence of soil properties on the growth and distribution of Portulacaria Afra in subtropical thicket, South Africa
- Authors: Becker, Carina Helene
- Date: 2013
- Subjects: Portulacaria afra -- South Africa , Plant conservation -- South Africa , Shrubs -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10753 , http://hdl.handle.net/10948/d1013046
- Description: Subtropical Thicket is the dominant vegetation biome in the Eastern Cape, and extends through to parts of the Western Cape. It is dominated by Portulacaria afra (spekboom), a woody succulent plant recognised for its importance as an ecosystem engineer and its carbon sequestration potential. Due to excessive grazing from domestic stock, spekboom has been completely removed from some areas. The Subtropical Thicket Restoration Programme (STRP) initiated a large scale restoration programme of planting spekboom cuttings in these degraded areas. Their efforts have been met with varying levels of success and improvement of the programme relies on continuous monitoring and scientific evaluation. I investigated the influence of selected soil properties on spekboom growth, mortality and landscape distribution, at both restoration sites and natural intact areas, and through experiments. Site or location was the most important factor influencing spekboom success at restoration plots, whereby sites in the eastern end of spekboom distribution perform better. Moving westwards slope orientation emerged as an important factor, whereby north facing slopes are preferred by spekboom. Although high levels of soil salinity (NaCl) restricted spekboom growth and affected its health, it could tolerate the levels it was exposed too. Soil pH, above 7, and phosphorous concentration, above 70 mg.kg-1, were the only limiting factors to spekboom survival found in the restoration sites. This preference for acidic soils was mirrored in intact Thicket. However in general, soil is not a major factor influencing spekboom growth and distribution, and spekboom is tolerant of a wide range of soil conditions. Spekbooms constraint is most likely a function of climate, which varies greatly across the biome. This study answered some vital questions regarding the possible influence of soil in spekboom growth and distribution. It disapproved the theory that a catena effect may be responsible for the lack of spekboom growing in bottomland areas. The study also indicates and supports the versatility of spekboom as a plant for restoring degraded lands across a range of different geologies and soil types. To maximise spekboom survival rates, restoration efforts should be focussed towards the eastern end of its distribution and to avoid planting in soils with pH levels higher than 7.
- Full Text:
- Date Issued: 2013
- Authors: Becker, Carina Helene
- Date: 2013
- Subjects: Portulacaria afra -- South Africa , Plant conservation -- South Africa , Shrubs -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10753 , http://hdl.handle.net/10948/d1013046
- Description: Subtropical Thicket is the dominant vegetation biome in the Eastern Cape, and extends through to parts of the Western Cape. It is dominated by Portulacaria afra (spekboom), a woody succulent plant recognised for its importance as an ecosystem engineer and its carbon sequestration potential. Due to excessive grazing from domestic stock, spekboom has been completely removed from some areas. The Subtropical Thicket Restoration Programme (STRP) initiated a large scale restoration programme of planting spekboom cuttings in these degraded areas. Their efforts have been met with varying levels of success and improvement of the programme relies on continuous monitoring and scientific evaluation. I investigated the influence of selected soil properties on spekboom growth, mortality and landscape distribution, at both restoration sites and natural intact areas, and through experiments. Site or location was the most important factor influencing spekboom success at restoration plots, whereby sites in the eastern end of spekboom distribution perform better. Moving westwards slope orientation emerged as an important factor, whereby north facing slopes are preferred by spekboom. Although high levels of soil salinity (NaCl) restricted spekboom growth and affected its health, it could tolerate the levels it was exposed too. Soil pH, above 7, and phosphorous concentration, above 70 mg.kg-1, were the only limiting factors to spekboom survival found in the restoration sites. This preference for acidic soils was mirrored in intact Thicket. However in general, soil is not a major factor influencing spekboom growth and distribution, and spekboom is tolerant of a wide range of soil conditions. Spekbooms constraint is most likely a function of climate, which varies greatly across the biome. This study answered some vital questions regarding the possible influence of soil in spekboom growth and distribution. It disapproved the theory that a catena effect may be responsible for the lack of spekboom growing in bottomland areas. The study also indicates and supports the versatility of spekboom as a plant for restoring degraded lands across a range of different geologies and soil types. To maximise spekboom survival rates, restoration efforts should be focussed towards the eastern end of its distribution and to avoid planting in soils with pH levels higher than 7.
- Full Text:
- Date Issued: 2013
The role of traditional leaders in enhancing service delivery in Mbhashe Local Municipality
- Authors: Bokwe, Abel Zingisa
- Date: 2013
- Subjects: Tribal government -- South Africa -- Eastern Cape , Local government -- South Africa -- Eastern Cape , Chiefdoms -- Africa, Southern , Municipal services -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8262 , http://hdl.handle.net/10948/d1013104
- Description: This study investigates the role of traditional leaders in enhancing service delivery in Mbhashe Local Municipality. The aim is to examine the involvement of traditional leaders in the provision of services to traditional communities. To achieve this goal, it was necessary to review literature on traditional leadership to advance an argument that by utilising the existing channels of communication such as traditional councils, government programmes could be more efficiently advertised. A secondary objective was to examine the relationship between traditional leaders and democratically elected councillors in the delivery of services. The problem in Mbhashe Local Municipality is that traditional leaders and the democratically elected leaders do not work together for service delivery. In order to address this problem, face-to-face interviews were conducted with the identified sample and conclusions drawn from their responses. The research revealed that if properly utilised and capacitated traditional leaders can indeed play a pivotal role in the enhancement of service delivery in Mbhashe Local Municipal area and in South Africa as whole.
- Full Text:
- Date Issued: 2013
- Authors: Bokwe, Abel Zingisa
- Date: 2013
- Subjects: Tribal government -- South Africa -- Eastern Cape , Local government -- South Africa -- Eastern Cape , Chiefdoms -- Africa, Southern , Municipal services -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8262 , http://hdl.handle.net/10948/d1013104
- Description: This study investigates the role of traditional leaders in enhancing service delivery in Mbhashe Local Municipality. The aim is to examine the involvement of traditional leaders in the provision of services to traditional communities. To achieve this goal, it was necessary to review literature on traditional leadership to advance an argument that by utilising the existing channels of communication such as traditional councils, government programmes could be more efficiently advertised. A secondary objective was to examine the relationship between traditional leaders and democratically elected councillors in the delivery of services. The problem in Mbhashe Local Municipality is that traditional leaders and the democratically elected leaders do not work together for service delivery. In order to address this problem, face-to-face interviews were conducted with the identified sample and conclusions drawn from their responses. The research revealed that if properly utilised and capacitated traditional leaders can indeed play a pivotal role in the enhancement of service delivery in Mbhashe Local Municipal area and in South Africa as whole.
- Full Text:
- Date Issued: 2013
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