Long-term changes in land use, land cover and vegetation in the Karoo drylands of South Africa: implications for degradation monitoring

We used several large data sets at a range of temporal and spatial scales to document the land-use/land-cover change (LULCC) dynamics of the semi-arid Succulent Karoo and Nama-Karoo biomes of South Africa. More than 95% of the Karoo is comprised of land classified as Natural, which has been relative...

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Bibliographic Details
Published in:African journal of range & forage science 2018-12, Vol.35 (3-4), p.209-221
Main Authors: Timm Hoffman, M, Skowno, Andrew, Bell, Wesley, Mashele, Samukele
Format: Article
Language:English
Subjects:
Arid environments
Aridity
Biodegradation
Cultivation
desertification
Deserts
Ecosystems
Environmental degradation
Environmental impact
Environmental monitoring
Land cover
land cover change
Land use
Livestock
NDVI
Protected areas
remote sensing
Renewable energy
repeat photography
Semi arid environments
Semiarid environments
Vegetation
Vegetation cover
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Summary:We used several large data sets at a range of temporal and spatial scales to document the land-use/land-cover change (LULCC) dynamics of the semi-arid Succulent Karoo and Nama-Karoo biomes of South Africa. More than 95% of the Karoo is comprised of land classified as Natural, which has been relatively stable since 1990. Over the last 100 years cultivation, as well as the number of domestic livestock, has declined significantly in both biomes. Protected areas have increased since 1980 to comprise nearly 8% of the Succulent Karoo biome, although they only cover 1.6% of the Nama-Karoo biome. There has been a significant recent increase in renewable energy installation applications, which cover 4% of the Karoo drylands. The trend in vegetation productivity (NDVI; 1982-2015) is unchanged over 90% of both biomes, while nearly 10% of the Karoo has shown a significant increase in NDVI trend. An analysis of repeat photographs shows that vegetation cover has either remained unchanged or has increased at most locations. Although the Karoo drylands appear less degraded than they were in the mid-twentieth century, on-going monitoring at different temporal and spatial scales is essential to evaluate the future impact of LULCC on these semi-arid environments.
ISSN:1022-0119
0256-6702
1727-9380
DOI:10.2989/10220119.2018.1516237