Spatio-temporal changes in cultivated land have a profound impact on food security and sustainable development. However, existing studies on spatio-temporal changes in cultivated land mostly focus on single factors, for instance quantity, quality and ecology, that cannot comprehensively reflect the changes in total production capacity and the sustainability of cultivated land.

Soil erosion is a global environmental problem and a pervasive form of land degradation that threatens land productivity and food and water security. Some of the biggest sources of sediment in catchments are cultivated and abandoned lands. However, the abandonment of cultivated fields is not well-researched. Our study assesses the level of degradation in cultivated and abandoned lands using a case study in South Africa. We answer three main questions: (1) What is the extent of crop field degradation on used, partly used, and abandoned fields?

Since the global crises in the 2000s, many foreign and domestic actors have acquired large tracts of land for food and biofuel crop cultivation and other purposes in Africa, often leading to the displacement of the African people living on customary land. The weak customary land rights of ordinary African people have been viewed as one of the main factors making it possible for various land-grabbers to exploit customary land with different purposes.