Urbanization effects on vegetation cover in major African cities during 2001-2017 |
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| Affiliation: | 1. Geospatial Sciences Center of Excellence, South Dakota State University, Brookings, SD, USA;2. Department of Geography and Environmental Sustainability, The University of Oklahoma, Norman, OK, USA;1. Laboratory of Critical Zone Evolution, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;2. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China;3. School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China;4. Key Laboratory for National Geography State Monitoring (National Administration of Surveying, Mapping and Geoinformation), China;1. Department of Geography, San Diego State University, San Diego, CA 92182-4493, USA;2. Center for Remote Sensing and Geographic Information Services, University of Ghana, Legon, Ghana |
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| Abstract: | Urbanization effects on vegetation cover (VC) have been analyzed in many regions. However, little attention has been paid to Africa, which has undergone rapid urbanization in recent decades. In this study, MODIS land cover and enhanced vegetation index (EVI) data were used to examine urbanization effects on VC in 59 large cities in Africa during 2001–2017. The ΔEVI (urban EVI minus rural EVI) was used to represent urbanization effects on VC. Major findings include: (1) for 59 cities averaged, annual ΔEVI averaged from 2015 to 2017 was -0.116. Negative annual ΔEVI (i.e. urban EVI lower than rural) were observed in 56 of 59 cities. (2) For 59 cities averaged, urban area increased 17.9% from 2001 (262.8 km2) to 2016 (309.8 km2). (3) Annual ΔEVI decreased significantly (p<0.05) in 44 of 59 cities for the period 2001–2017, and annual average area of urbanization effects on VC increased significantly in 40 of 59 cities. For 59 cities averaged, the percentage of urban area with significant decreasing trends of annual ΔEVI was 60.0%. Spatially, cities near the Gulf of Guinea showed more significant decreasing ΔEVI than cities in other regions. In addition, the trends and spatial distributions of urbanization effects on VC differed little by seasons. These results suggested that urbanization and its effects on VC in Africa should arouse more attentions. |
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| Keywords: | Urbanization Vegetation Remote sensing Enhanced vegetation index Africa |
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