Indigenous plants in the Limpopo province : potential for their commercial beverage production

South Africa has over 19 500 different indigenous plant species. Most of these are of ethnobotanical significance and are still used by local rural communities as medicine, food and for making beverages. The relatively little research that has been conducted on indigenous plant species has focused mainly on their medicinal potential. However, in view of the rapidly growing size of the global and local beverage industry and their constant search for new products, beverage-making indigenous plant species may have commercial development potential. To date, no detailed studies have been conducted on these plants, especially in the species-rich Limpopo province. The aim of this study was, therefore to evaluate the potential of indigenous plants for commercial beverage production. In order to achieve this, a survey was conducted in the Limpopo province to identify beverage-making plants and to document beverage preparation methods. Selected beverages were analysed and evaluated for their nutrient and sensory characteristics and a market product acceptability survey was conducted to identify those beverages with the greatest potential for development. Sixty three different beverage-plant species were identified in three study areas within the Limpopo province. These were used for the preparation of teas, fruit juices and alcoholic beverages. Plants that received further research attention were selected on the basis of their status as indigenous plants, frequency of use, nature of harvesting methods and availability. Some of the selected beverages were found to be rich in nutrients, especially with respect to vitamin C and mineral content. Furthermore, sensory analyses and market surveys indicated that four species, namely, Doyvalis caffra, Garcinia livingstonei, Grewia flavescens and Englerophytum magalismontanum have potential for further development for the beverage industry while Athrixia phylicoides has commercialisation potential as a herbal tea. However, further research is required to improve and refine preparation methods and to ensure compliance with quality standards. The availability of sufficient plant material for the industry must also be ensured. This research has indicated that South African indigenous plants have untapped market potential for the beverage industry which, if developed sustainably, could contribute to economic growth of the rural parts of South Africa.Environmental SciencesD. Ed. (Environmental Management

Assessing the potential of remote sensing to discriminate invasive Seriphium plumosum from grass

The usefulness of remote sensing to discriminate Seriphium plumosum from grass using a field spectrometer data was investigated in this study. Analysis focused on wavelength regions that showed potential of discriminating S. plumosum from grass which were determined from global pair spectral comparison between S. plumosum and grass. Assessment of reflectance differences done at individual and plot levels using original spectra and spectra simulated based on bands of Landsat and SPOT 5 images. The simulations were done to investigate the possibility of extending field based information into airborne and spaceborne remote sensing techniques. Results showed reflectance spectra of S. plumosum and grass to be relatively comparable. Comparisons at all levels of analysis using original spectra did not show noteworthy reflectance difference in all regions used in the analysis. Similarly, simulated spectra did not show significant differences. The results therefore did not appear to encourage the potential of upscaling the application to airborne and spaceborne remote sensing techniques. There were, however, some shortcomings that made it difficult to draw conclusive remarks on whether the plant can be differentiated from grass. These included, firstly, not all species were in the same phenology. Secondly, spectral measurements were not necessarily taken in an ideal scenario of optimal sunny conditions. It is therefore advised that a similar study be carried out that will address the shortcomings of this study. Furthermore, studies on the biochemical composition of both S. plumosum and grass species are needed, since they explain spectral properties of plants

Evaluating the quality of environmental impact reporting for proposed tourism-related infrastructure in the protected areas of South Africa: a case study on selected EIA reports.

Environmental impact assessment (EIA) is an important planning tool to strengthening environmental policy decisions by encouraging the sustainability of development projects that may lead to adverse environmental impacts and large-scale environmental degradation. The South African National Environmental Management Act (NEMA) (Act No. 107 of 1998) and the 2010 EIA Regulations (GNR 543 and 546) provide minimum requirements for environmental assessment that is classified as basic environmental impact assessment, amongst other instruments. In this case study, the quality of Basic Environmental Impact Assessment Reports (BEIARs) compiled for planned tourism-related infrastructure in and around the Protected Areas (PAs) of the Mpumalanga and Limpopo provinces of South Africa was examined. To achieve this goal, the case study adopted a modified Lee and Colley Review Package. The findings of this case study showed that 92% of the BEIARs performed satisfactorily in terms of overall quality while only 54% attained ‘exceptionally good’ quality meanwhile a high proportion of BEIARs were of borderline quality. Moreover, although the degree of legal compliance was relatively high as compared in other EIA studies in South Africa, the more descriptive assessment tasks were conducted typically well as compared to other tasks that required more analytical capabilities. The case study also pinpointed other areas in need of further improvement and refinement so that planned tourism-related facilities do not cause long-term environmental damage in the protected areas of South Africa

Research article Morphology and elemental analysis of freshly emitted particles from packed-bed domestic coal combustion

Abstract: This study was conducted in a laboratory-controlled environment to analyse the physical properties and elemental composition of coal combustion particles in a brazier. Particles were sampled ~1 m above the stove, using a partector. Particles were collected on gold transmission electron microscopy (TEM) grids, and polycarbonate filters for TEM and inductively coupled plasma mass spectrometry (ICP-MS) analysis, respectively. Particles for elemental analysis were collected on a 37 μm polycarbonate filter, and the exhaust was drawn in using a GilAir Plus pump. During sampling, a 2.5 μm cyclone was attached to the sampling cassette to isolate larger particles. Combustion particles emitted during the early stage of combustion were single organic spherical particles with similar characteristics to tarballs. As the combustion progressed, the particle diameter gradually decreased (from 109 nm), and the morphology changed to smaller particles (to 34.3 nm). The particles formed accretion chain structures, showing evidence of agglomeration. Furthermore, a fluffy microstructure, resembling the formation of soot, was formed in the post flaming phase. In the char-burning phase, an irregular structure of semi-spherical particles was formed, showing evidence of mineral particles infused with small carbonaceous particles. Similarly, with the findings of previous studies, the present research also observed organic spherical particles similar to tarballs. Given that during the ignition phase there was a simultaneous burning of wood as kindling and coal, the provenance of these particle emissions can be attributed to both coal and wood

Soil erosion in and adjacent to the Pilanesberg Nature Reserve (Northwest Province)

M.Sc. (Geography)This study concentrates. not only on the physical and chemical factors influencing erosion levels in the Pilanesberg area, but also on the impact of anthropogenic factors such as artificial drainage and other cultural irregularities that have modified the local catchment in the Pilanesberg area. For this reason, a comparative study of soil erosion has been made across the perimeter of the Pilanesberg Nature Reserve. The study'aimed to analyze the impact of climatic factors, chemical and physical properties of the soils on the local erosion system. Possible triggering mechanisms of the erosion have been discussed and conservation concerns in the Pilanesberg area have been raised. Of major importance in this study has been the'estimation of soil loss rates across the perimeter of the PNR.. This was premised on the 'rationale that population pressure has an impact on the local erosion system, Through the' analysis of sediment trapped at the monitoring sites it has been possible to indicate the tremendous impact of population pressure on the slopes of the Pilanesberg hills, just outside of the PNR. The rate at which soil is lost on the surrounding rural landscape in the Pilanesberg area has been found to be on average. nearly four times higher than inside of the PNR

Bibliometric Analysis of Municipal Solid Waste Management Research: Global and South African Trends

Municipal solid waste management has become one of the most important environmental management issues around the world. In this study, a bibliometric analysis of the literature related to municipal solid waste management from a global and South African perspective was performed using the software, VOSviewer. Relevant scientific literature was sourced from the Scopus database. Results showed that, globally, articles based on this topic started during the 1968–1969 period, whereas in South Africa such articles only appeared in 1996. The keyword analysis showed that most studies were related to waste-to-energy technologies, waste treatment, and other management aspects. Globally, emerging keywords representing new research areas were COVID 19-related waste streams, life-cycle assessments, and the role of municipal solid waste management in the circular economy. In contrast, South Africa’s prominent keywords were municipal solid waste, developing country, landfills, waste treatment, waste-to-energy technologies, pollution, greenhouse gas emissions, and others. Based on these results, and possible solutions to reduce the amounts of MSW generation rates, recommendations are made to bring South African research on par with international trends

Drivers of Household Recycling Behavior in the City of Johannesburg, South Africa

This paper has assessed the relationship between recycling behavior and socio-demographic variables for households in Johannesburg, South Africa. The research also identified the underlying driving factors that motivate recyclers to separate their household waste for recycling. These objectives were addressed by means of a quantitative survey research design as well as descriptive and inferential statistical methods. Based on the results, the statements that represented attitudes, subjective norms, perceived control, moral norms, situational factors, outcomes, and consequences of recycling were highly agreed to by respondents. Three factors influencing household recycling behavior were identified, namely, recycling benefits, perceived control, and situational variables. The recycling benefits construct explained 45.6% of the variance, followed by the perceived control construct (12%) and the situational variables construct explained 11% of the variance. However, the results of the EFA and multiple regression identified the situational variable as the greatest single driver of household participation in recycling. It is therefore important to overcome situational barriers that the residents of Johannesburg are currently facing if the current household waste separating program is to become successful. This would require simplifying the process of household recycling by providing appropriate knowledge, infrastructure, and the space for waste sorting and its collection

Understanding the Determinants of Pro-Environmental Behavior among South Africans: Evidence from a Structural Equation Model

This paper explores the relationship between pro-environmental behaviour (PEB) and environmental awareness, knowledge, attitudes, risk perceptions and activism in South Africa. To achieve this goal, the 2010–2012 data from the International Social Survey Program “Environmental III” was analysed by means of descriptive and inferential statistics, including the employment of the structural equation model. Significant differences were found between pro-environmental behaviour and other environmental variables such as environmental concern, awareness, willingness to sacrifice, and others in terms of the educational background, place of living, ethnic identity and provinces where respondents lived. Thus, to increase PEB amongst citizens would require the introduction and support of development programmes that enhance access to more education and environmental awareness across all population groups

Tracing and Determining the Duration of Illegal Sand Mining in Specific River Channels in the Limpopo Province

Artisanal and Small-scale river sand mining is one of the upcoming activities associated with the environmental crisis concerning the water ecosystem. However, the determination of the duration in which illegal sand mining has occurred, and the future prediction on the extent of river sand mining is not well-established in most of the world. This study aimed to assess the extent of river sand mining activities across some of the catchments in Limpopo province, South Africa and understand the sustainable extraction of sand resources. This was followed by the determination of when sand mining activities commenced in each of the individual catchments. Thus, remote sensing was applied to predict the extent of river sand mining from the year 1992 to 2022, and statistical prediction models were utilised to predict the extent of sand mining for the next 10 years. The results of the study suggest that most of the catchments started to experience illegal sand mining activities from the year 1992, though the extraction was relatively low. Equally, a decrease in vegetation coverage across the river system has been evidenced, which also suggests that the extraction of sand and gravel has been elevated from the year 2010. In terms of the prediction model, the Turfloop River system was predicted to experience a large extraction ratio in the coming 10 years, with about 92.415 ha of land expected to be affected. Meanwhile, the Molototsi River system was denoted to be the least affected river system, with a reduced extraction ratio of about 6.57 ha expected in the next 10 years’ time