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21 April 2023 | Story Leonie Bolleurs | Photo Supplied
Striving to make a difference in the field of biodiversity conservation, Dr Katlego Mashiane decided to pursue a PhD in Geography, focusing on the spatial modelling of grassland diversity and nutrients in subalpine environments. He received his PhD during the recent April graduation ceremonies on the Qwaqwa Campus.

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

Chemistry Department expands its international footprint
2015-10-14

Prof André Roodt

Prof André Roodt from the Department of Chemistry at the University of the Free State has returned from a research visit at the St Petersburg State University in Russia. The research he conducted at the St Petersburg State University is part of a bilateral collaboration agreement between the University of the Free State and St Petersburg State University.

As part of his visit to Russia (from 17 to 28 September 2015), Prof Roodt presented a seminar at St Petersburg State University, and a lecture at the conference titled: International conference on Organometallic and Coordination Chemistry: Achievements and Challenges.

One of the local Russian newspapers quoted Prof Roodt as “world-renowned expert in the study of chemical kinetics and mechanisms of chemical reactions”. His presentation: Are detailed reaction mechanisms really necessary in (applied) organometallic and coordination chemistry' attracted great interest from the St Petersburg chemists.

The bilateral agreement came to life a year ago when the St Petersburg State University chemists won a grant in a competition to create an international research group, the International Laboratory of Organometallic Chemistry. The Laboratory is headed by Prof Vadim Kukushkin of the St Petersburg State University.

In addition to the employees of St Petersburg University, the research group consists of researchers from Portugal, Finland, South Africa, and Azerbaijan. Together, these groups of scientists are working on the problem of non-reactive metal activation molecules. The main theme of the research laboratory is in the catalysis and activation of metal inert molecules which then undergo significant change, and become meaningful to people chemicals, such as drugs.

As part of this initiative, a bilateral collaboration agreement exists between the St Petersburg State University and the UFS (Russian Science Foundation grant 14-43-00017). Students from our university have visited and conducted research at the St Petersburg State University while some of their students visit and research reaction kinetics at the UFS.

Prof Roodt hosted Valeria Burianova, a student from the St Petersburg University. During her visit at the UFS, she learned about response kinetics. A UFS PhD student, Carla Pretorius, joined the group in Russia where she conducted research on the intermetallic rhodium-rhodium interactions for the formation of nano-wires and -plates, with applications in the micro-electronics industry, and a  potential for harvesting sun energy.

The UFS Department of Chemistry extended its international footprint further with three of its students, Mampotsu Tsosane, Petrus Mokolokolo, and Tom Kama, returning from Switzerland after a six-week research visit in the group of Prof Roger Alberto from the University of Zürich. In return, Prof Roodt hosted a Swiss PhD student, Angelo Frei from Zürich, and taught him more about reaction mechanisms.

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