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Curiosity about environmental changes drives Dr Katlego Mashiane’s PhD research

21 April 2023 | Story Leonie Bolleurs | Photo Supplied

In the small village of Ga-Mabotia about 25 km outside of Polokwane, Dr Katlego Mashiane grew up, surrounded by rocky mountains characterised by boulder outcrops, where he interacted with nature from an early age.

He recently obtained his PhD, majoring in Geography, from the University of the Free State (UFS), which was conferred on him during the April graduation ceremonies that took place on the UFS Qwaqwa Campus. The title of his dissertation is Grass nutrients estimation as an Indicator of rangeland quality using satellite remote.

Predicting the presence of biodiversity and nutrients in an area

Based on the principle that diverse grasslands tend to perform better, environmental changes threaten the resilience and services these grassland ecosystems provide. The study examined how many different types of plants and animals can be found at a particular place to enhance our understanding of the ecosystem’s value to humans, and that biodiversity loss will reduce these ecosystem services. Focusing on spatial modelling of grassland diversity, Dr Mashiane specifically investigated the influence of topography and remotely sensed satellite data on species richness and diversity in subalpine environments, and how they are affected by the availability of grass species. To determine this, he used a random forest machine-learning algorithm to find the best information in the data that could be used to estimate the levels of species richness, diversity, and nitrogen in a protected national conservation park.

His study discovered that some data types – such as the near-infrared variable and certain vegetation data (EVI and SAVI) – were especially useful for determining the number and variety of species in a certain area. With this information, scientists can create models that predict the presence of different types of biodiversity and nutrients in an area.

Playing a key role in protecting our natural assets

Equipped with this knowledge, one will be able to understand how to protect and preserve different types of biodiversity and promote the nutritional value of both plants and animals in the environment. “Land managers could use this information for conservation strategies,” states Dr Mashiane, who decided to pursue this study because he was curious about how environmental changes will affect species.

“Grasslands provide important ecosystem services underpinning human well-being, and therefore warrant our protection; I would like to play a role in protecting our natural assets and contribute to understanding our biomes, especially in the context of global change,” he says.

In the next five years, Dr Mashiane plans to pursue further research and mentor other students in his field of study.

News Archive

Four modernised controlled environment cabinets inaugurated

2006-07-27

Photographed in a controlled environment cabinet were at the back from the left: Mr Adriaan Hugo (head of the UFS Electronics and Mechanisation Division), Prof Herman van Schalkwyk (Dean: Faculty of Natural and Agricultural Sciences at the UFS) and Prof Koos Terblans (lecturer at the UFS Department of Physics). In front is Mr Koos Uys (engineering consultant from Experto Designa who helped with the cooling systems of the cabinets).
Photo: Leonie Bolleurs

Different look for research in controlled circumstances at the UFS

Research in controlled circumstances at the University of the Free State (UFS) turned a new page today with the inauguration of four modernised controlled environment cabinets of the Department of Soil, Crop and Climate Sciences.

“The controlled environment cabinets, which are situated next to the glass houses on the eastern side of the Agriculture Building on the Main Campus in Bloemfontein, were installed in the early 1980’s. The cabinets, used for research purposes in controlled circumstances by the UFS for many years, became dysfunctional and needed to be repaired and put into use again,” said Prof Herman van Schalkwyk, Dean: Faculty of Natural and Agricultural Sciences at the UFS.

“The cabinets are used by the agronomics, horticulture and soil science divisions of the Department of Soil, Crop and Climate Sciences to control factors such as the temperature, the intensity and quality of light, synthesis and humidity. This is done 24 hours a day, with hourly intervals,” said Prof Van Schalkwyk.

The cabinets are ideally suited to determine the joint and separate effects of these factors on the growth of plants. The adaptability of plants to climate can also be investigated under controlled circumstances. All of this leads to a better understanding of the growth and development process of plants, more specifically that of agricultural crops.

“The effect of these environmental factors on the effectiveness of insect killers such as fungus killers, insecticide and weed killers can also be investigated and can help to explain the damage that is sometimes experienced, or even prevent the damage if the research is timeously,” said Prof Van Schalkwyk.

A new cabinet can cost between R2-3 million, depending on the degree of sophistication. “Although controlled environment cabinets have been used for agricultural research for a long time, it has become costly to maintain them and even more impossible to purchase new ones,” said Prof Van Schalkwyk.

According to Prof Van Schalkwyk the cabinets were re-built by die UFS Electronics and Mechanisation Division. Some of the mechanisms were also replaced and computerised.

“The re-building and mechanisation of the cabinets were funded by the faculty and because the work was done by our own staff, an amount of about R1 million was saved. The maintenance costs will now be lower as the cabinets are specifically tailor made for our research needs,” said Prof Van Schalkwyk.

Where all monitoring was done manually in the past, the cabinets can now be controlled with a computer. This programme was designed by Prof Koos Terblans from the UFS Department of Physics.

According to Prof Van Schalkwyk the modernisation of the cabinets is part of the faculty’s larger strategy to get its instruments and apparatus up to world standards. “With this project we have proved that we can find a solution for a problem ourselves and that there are ways to get old apparatus functional again,” said Prof Van Schalkwyk.

Media release
Issued by: Lacea Loader
Media Representative
Tel: (051) 401-2584
Cell: 083 645 2454
E-mail: loaderl.stg@mail.uovs.ac.za
26 July 2006

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