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Carbon – the connection between the atmosphere, soil, and plants

27 September 2021 | Story Leonie Bolleurs | Photo Supplied

Web read more — Eddie Smit, Tercia Strydom, and Prof Johan van Tol testing the hydrophobicity of soils directly after an experimental fire.

The main driving force behind climate change is the emission of greenhouse gases through human activities, says Prof Linus Franke, Associate Professor and Head of the Department of Soil, Crop and Climate Sciences at the University of the Free State.

“Carbon dioxide is the biggest culprit, accounting for 72% of the global warming effect, followed by methane and nitrous oxide.”

Too much carbon in the atmosphere

Human activities are the main driver of climate change, mainly by burning fossil fuels such as coal, gas, and oil, with the energy sector, industries, transport, buildings, and agriculture as the biggest emitters of greenhouse gases.

According to the United Nations, the burning of these fossil fuels generates greenhouse gas emissions that wrap around the earth like a blanket, trapping the heat of the sun and resulting in raised temperatures. According to Prof Franke, it is important to mitigate climate change and prevent a global temperature rise of more than 1,5 degrees Celsius. According to the Intergovernmental Panel on Climate Change (IPCC), we are looking at a temperature increase of around four degrees Celsius by the end of this century, if there are no drastic changes.

With an increase in global warming, we are expecting more disturbances in weather patterns, resulting in further extreme weather conditions such as droughts, floods, and extremely cold/hot conditions. Annually, millions of people lose their lives, livelihoods, and homes due to the effects of global warming.

“The latter has been predicted for a long time, but today it is a common phenomenon. Twenty years ago, climate change was about analysing trends in data sets. Today, to observe climate change, one can just look out of the window. In the past 10 years, climate change has become a reality,” says Prof Franke.

Although carbon dioxide is one of the biggest contributors to global warming, it has an important role to play in soil health.

Soil as a major sink of carbon

As plants absorb the carbon dioxide from the atmosphere, enormous amounts of carbon are stored as organic soil matter in the upper two metres of soil. Prof Franke says carbon in the top two metres of soil is 200 times more than the amount that is annually emitted by human activities and three times the amount that is present in the atmosphere or vegetation.

“Carbon in soil plays an important but underestimated role,” he says. He believes that through proper soil management, humans can control the amount of carbon in the atmosphere. In the long term, this could have a positive effect on climate change.

“Our ultimate aim it to get sufficient amounts of carbon in the soil,” says Prof Franke. His department is involved in several studies to understand soil carbon and carbon sequestration processes.

Odwa Malongweni collecting a soil sample from exclosures in the Kruger National Park.(Photo: Supplied)

Prof Johan van Tol, Associate Professor in the same department, and postgraduate students are conducting research in the Kruger National Park and the Drakensberg, where they are investigating the best ways to preserve carbon and increase the soil carbon levels.

He is of the opinion that there are two viable options for storing carbon removed from the atmosphere: the soil and the oceans. “Of the two, storing carbon in the soil is more realistic for most people and companies, as ownership and management of this natural resource can be determined. The potential for storing carbon in the soil is vast, yet poor soil management has led to carbon emissions equal to that of burning oil and coal reserves. Good soil management and restoration of degraded soils, on the other hand, can result in considerable sequestration of atmospheric carbon,” he says.

According to him, soil and environmental factors determine the carbon storage potential of the soil. He says in the mountainous soils of the Maloti-Drakensberg (MD), the cool climate and high rainfall have resulted in carbon-rich soils. “This area is generally considered a ‘carbon hotspot’, yet little is known about the carbon dynamics of these soils.”

Preliminary results from a project by two of his postgraduate students, Cowan Mc Lean and Jaco Kotze, titled Characterisation of carbon stocks, microbial diversity and degradation of the soils of the Amphitheatre summit, Northern Drakensberg, show that average carbon stocks of the soils are high to very high in the alpine wetlands. They found that poor land management (overgrazing) has resulted in soil and land degradation (e.g., erosion, draining of wetlands, and loss of vegetation and biodiversity).

“The degraded soils are no longer a ‘sink’ of atmospheric carbon, but become a ‘source’ that releases carbon,” he states.

He says drastic action is required to restore and protect these important carbon hotspots.

Today, to observe climate change, one can just look out of the window. In the past 10 years, climate change has become a reality. – Prof Linus Franke

In a study in the Kruger National Park, PhD students Tercia Strydom and Odwa Malongweni are investigating the impact of fires and herbivores on soil quality, including carbon contents. “They found that soil carbon is significantly impacted by fire and herbivores. The changes in vegetation structure due to fire and herbivores are likely to be the key driver of changes in carbon stocks,” says Prof Van Tol.

An agricultural perspective

Prof Franke considers carbon as an essential element for farming. “It is important for a healthy farming system,” he says.

He is conducting a study on high-density grazing, funded by the Regional Universities Forum for Capacity Building in Agriculture. The on-farm performance of different grazing management systems, including selective and high-density grazing, with special reference to the spatial and temporal dynamics of soil carbon, is investigated in this study.

The research indicates that the grassland biome of South Africa covers about 20% of South Africa’s land surface, with more than half of the biome converted to arable land or greatly disturbed by urban development mining activities. The remaining tracks of the grassland biome are mostly used for livestock grazing on natural grassland.

Prof Johan van Tol, Sue van Rensburg from the South African Environmental Observation Network, and Prof
Linus Franke in the Drakensberg. (Photo:Supplied)

He says there are different grazing management strategies of natural grasslands. “In continuous grazing systems, animals are given the opportunity to graze all season long with minimal interference. Rotational grazing systems incorporate periodic deferments, allowing field vegetation to recover in the period when grazing is absent.

“The more recent strategy of high-density grazing uses large herds, often double or triple the normal stocking densities for an area, grazing intensively on small areas of land for a short period of time, followed by a long resting period of the field.”

“High-density grazing is claimed to improve rangeland productivity by improving soil health, increasing soil carbon stocks to an extent that the emissions of greenhouse gases by livestock may be compensated by soil carbon sequestration, and improving the condition of the vegetation, while enhancing animal productivity on a per area basis. The adoption of high-density grazing can have major impacts on the sustainability and the economics of livestock production. An aim of the research is to quantify to what extent the claims of increasing soil carbon levels under high-density grazing realise under on-farm conditions,” explains Prof Franke.

He trusts that the knowledge generated in this project will be helpful to the broader agricultural sector, providing knowledge on carbon cycling, environmental sustainability, and opportunities for climate change mitigation in the livestock production sector.

Prof Franke is convinced that the protection of grasslands against degradation, while ensuring sufficient, reliable, and sustainable food production, are absolute key components driving the national and global development agenda.

Prof Johan van Tol taking a soil sample on top of the Drakensberg. (Photo: Supplied)

News Archive

During 2011: Highlights at the UFS

2011-12-01

2011 was a phenomenal year in the life of the University of the Free State and the memorable moments will be engraved in the history of this proud institution.

World Universities Forum honours the UFS

The UFS was awarded the World Universities Forum (WUF) Award for Best Practice in Higher Education during 2010.The Best Practice Award recognises the most significant practices of the year around the world. The university’s implementation of a number of interlocking innovations to transform the institution is recognised with the award.

These innovations include: campus-wide racial integration for students; reinvigoration of the academic culture; nurturing of the most promising young scholars by means of the Vice-Chancellor's Prestige Young Scholars Programme; sending 71 first-year students to top American universities to assist with their development into non-racial campus leaders; the revision of the undergraduate curriculum to promote a cross-disciplinary approach to key societal problems; raising the entry requirements; the facilitation of open access to campus leadership through sessions with the Vice-Chancellor and Rector; extension of this spirit of dialogue internationally through the inauguration of its International Advisory Council consisting of key thinkers and practitioners; the identification of 20 of the most dysfunctional high schools in the Free State and the building of relationships with those schools.

This university-school partnership is based on a strict contract of reciprocal commitments to increase the chances of black children attending university. The WUF applauded this as the most innovative step.

New branding for our 107-year old institution

Our university turned a fresh new page with the launch of a new brand that will take the institution on its path to new horizons.

Two primary brands were adopted – an evolved academic crest and a new marketing brand for the institution’s offerings and services. The very foundation of the UFS is built on a dynamic learning environment where academic excellence and the development of leadership qualities. The new brand seeks to adapt to the changing needs of society, without sacrificing its rich history and heritage.

The rebranding process involved one of the most expansive and intensive process of consultations with staff, alumni, Senate, Council and other stakeholders.

The new brand is anchored in the university’s renewed motto “In Veritate Sapientiae Lux” (In Truth is the Light of Wisdom), which has been evolved to embrace the diversity of the community at the university without losing its essence.

Archbishop Desmond Tutu receives an honorary doctorate

One of the great sons of Africa, Archbishop Emeritus Desmond Tutu, received an honorary doctor of Theology and opened the International Institute for Studies in Race, Reconciliation and Social Justice on the Bloemfontein Campus at the beginning of 2011.

The Institute originated in the Reitz incident of 2008 and embodies the UFS’s determination to be a place where reconciliation, forgiveness and social justice would not only be studied, but where it would also be applied. Students and scholars from across the world can study the theory and practice of building societies across the boundaries of race, as well as religion, gender, disabilities and national origin.

By honouring Dr Tutu, the UFS recognises the contribution he has made in the field of Theology through his teachings and the books he has written. The UFS not only honoured him as a moral and religious leader who has maintained his integrity as a Christian, but also as “a great son of South Africa who has made a huge contribution to peace, reconciliation and justice in South Africa and in the world”.

Reconciliation closes book on the Reitz incident

The Reitz incident, that has taken the UFS to front pages and news headlines, could come to closure this year with a reconciliation ceremony between the former students and staff members. The parties involved could meet in private and also took part in a public ceremony with many dignitaries witnessing the closure of the incident and repercussions it had.

Messages of apology were read by Prof. Teuns Verschoor, Vice-Rector: Institutional Affairs, on behalf of the UFS, and Mr Danie Grobler, on behalf of the former students. A message of acceptance of the apologies was read by Ms Emmah Koko on behalf of the workers.

Deputy Chairperson of the South Africa Human Rights Commission, Commissioner Pregs Govender, said of this historic event: “The courage and compassion shown by the workers together with the students’ willingness to embrace the spirit of change have enabled a process of justice, transformation and reconciliation that is an inspiring example for South Africa.”

Grade 12s attend first Leadership Summit

More than 280 learners from all over South Africa and Namibia attended a three-day Leadership Summit on the Bloemfontein Campus in April 2011. The goal of the summit was to enable young leaders to develop their leadership capabilities by looking beyond their normal boundaries.

Prof. Jonathan Jansen, Vice-Chancellor and Rector, addressed the learners on leadership while Mr Louie de Necker, a training consultant, spoke about conflict resolution. Other highlights included a visit to the Boyden Observatory, picnic suppers, an introduction to residence life, a social evening, and a prize-giving ceremony aimed at learners who distinguished themselves as potential leaders during the three-day visit.

UFS honours great teachers

Our university and Sunday Times have joined hands in identifying 150 of the greatest teachers, who moved, inspired and transformed South Africans during their time at school. The project culminated in the book Great Teachers.

These are the teachers who stood out among their colleagues and made a lasting impact on their learners, inspiring them to excel, long after the mathematical equations and English literature tests are forgotten. The book is a powerful account of inspired and inspiring teachers.

All proceeds from the sales of the book will be used to provide bursaries to student teachers of today, who may become the great teachers for tomorrow’s generation.

Graduations now a celebration

By changing its format, graduations are now a festival to celebrate years of hard work and dedication of students and lecturers at our university. Some of the changes include the gathering of the procession on the Red Square in front of the Main Building, from where it moves to the Callie Human Centre. The graduation programme is also filled with music and song items with various young speakers addressing and inspiring the audience.

A total of 83 doctorates were conferred this year, making it the highest number in the history of the university.

African Student Affairs Conference a huge success

The first African Student Affairs Conference (ASAC) was hosted by our university. The conference was attended by delegates from universities across the continent and was aimed to place the focus on issues relating to student affairs in an African context.

Delegates shared and exchanged strategies, ideas and resources, and discussed issues related to the work of student-affairs professionals. A delegate from Nigeria said it was an important conference for Africa and it should become a regular event.

Research published in Nature

A research article on the work by a team under the leadership of Prof. Esta van Heerden, and counterparts in Belgium and the USA, has been published in the distinguished academic journal Nature on Thursday 2 June 2011.

The article – Nematoda from the terrestrial deep subsurface of South Africa – sheds more light on life in the form of a small worm (nematode) living under extreme conditions in deep, hot mines. It was discovered in one of the gold mines in the Free State.

The research can shed some new light on the possibility of life on other planets, previously considered impossible under extreme conditions. It also expands the possibilities into new areas where new organisms may be found.

Postgraduate School is one of a kind

Our Postgraduate School was launched with the aim of bringing research-bases education in line with national priorities and the focus of the UFS Academic Turnaround Strategy of 2010. It spans across our facilities.

The focus of the school is to produce graduates who are global citizens, research literate and able to reflect ethically on the purpose, process and product of research; to improve throughput rates of postgraduate students; and to make the experience of being a postgraduate at our university one which is stimulating, enjoyable and which contributes to the development of people beyond the limits of their disciplines.

Oprah Winfrey now a Kovsie

World attention was drawn to our university when an honorary doctorate in Education was conferred on media icon Oprah Winfrey on 24 June 2011 at our Bloemfontein Campus. The graduation was probably the biggest ceremony of its kind in South Africa, with more than 4 500 people attending.

Our university honoured her for her accomplishments and unparalleled work as a global media leader, as well as a philanthropist with vision and foresight in the field of education and development.

Prof. Jonathan Jansen, Vice-Chancellor and Rector of our university, said: “It is a great privilege for us to be the first South African university to honour Ms Winfrey in this way and to be able to recognise a global icon of her stature.”

UFS doctors make history in South Africa

Two procedures took the UFS to the forefront of the medical world this year.

History was made with the first implant of a special new aortic valve in South Africa. The advantage of this new valve is that it can be implanted percutaneously through a catheter from the groin. This eliminates the need for invasive surgery.

The valve is made from porcine pericardium (tissue derived from pigs) and is mounted on an expandable stent, which is threaded along an artery, until it reaches its desired position. The valve is especially useful in older patients who suffer from aortic valve disease and pose a high surgical risk. It also reduces hospitalisation time.

A rare malignant tumour was also removed in groundbreaking heart surgery. What makes this operation unique, is that the suspicious mass, identified in the heart of a 51-year old man, was rapidly growing into a highly invasive cardiac tumour seen in a small number of patients worldwide.

In the highly complex, 10-hour operation the entire right heart chamber had to be removed and the heart reconstructed.

School of Open Learning adds value

The activities of the new school are driven by a central principle: opening up access to those who have not had the opportunity to study at a higher-education institution due to geographical location, socio-economic circumstances or other factors.

Programmes are delivered through a blended-learning model, which blends contact teaching with distance education.

The school will collaborate with our various faculties, and is managing the continuing education-sponsored endeavours of the Faculty of Education. These include projects for in-service training of teachers in Mathematics, Natural and Physical Sciences, Languages, Literacy, Economic and Management Sciences, Technology and various areas of Management and Leadership.

Second group of young leaders abroad

A second group of first-year students in the Leadership for Change Programme visited universities in the USA, Europe and Asia. Our university could extent the programme to 150 students, up from 71 in 2010.

These students are seen as a leadership core, not only for their university life, but also in public life outside the university borders.

The main purpose behind the programme is to expose students to positive models of racial integration. Their experiences will go a long way towards changing and enriching the minds of young leaders, who have committed to building a truly non-racial society in South Africa.

Odeion School of Music launched

Our former Department of Music transformed into the Odeion School of Music. The name Odeion name portrays not only an excellent asset in the Free State, but also nationally and internationally.

The school’s new name bears the respected Odeion brand and a number of successful and respected ensembles operate under this brand. These include the residential Odeion String Quartet, student ensembles, the Junior Odeion String Quartet, the Odeion Sinfonia, and the Odeion Choir.

The formation of the school paths the way for more flexibility to complement its profile with new developments. These include the application of prestigious international experts as artistic fellows, membership to progressive European, jointly-developed degree programmes and curriculum development initiatives, the founding of a chair in Orchestra Conducting, a master’s degree in Arts Management, as well as the incorporation of bio-kinetics in the teaching methodologies of performance practice.

World-class Chemistry facilities opened

World-class Chemistry facilities, with state-of-the art equipment, opened on the Bloemfontein Campus.

The upgrading of the facilities and addition and replacement of equipment were the single biggest investment at our university in a long time.

Specialised research by the Department of Chemistry includes X-ray crystallography, electrochemistry, synthesis of new molecules, the development of new methods to determine rare elements, water purification, as well as the measurement of energy and temperatures responsible for phase changes in molecules, the development of agents to detect cancer and other defects in the body, and many more.

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