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Spatio-temporal pattern of urban vegetation in the central business district of the Wa municipality of Ghana

Trees, Forests and People (Online), 2022-06, Vol.8, p.100261, Article 100261 [Peer Reviewed Journal]

2022 ;ISSN: 2666-7193 ;EISSN: 2666-7193 ;DOI: 10.1016/j.tfp.2022.100261

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  • Title:
    Spatio-temporal pattern of urban vegetation in the central business district of the Wa municipality of Ghana
  • Author: Aabeyir, Raymond ; Peprah, Kenneth ; Hackman, Kwame Oppong
  • Subjects: LST ; Moran I ; NDVI ; Spatial cluster ; Spatial distribution ; Urban tree density
  • Is Part Of: Trees, Forests and People (Online), 2022-06, Vol.8, p.100261, Article 100261
  • Description: •The average tree density in the CBD of Wa as of March 2020 was 3 trees ha−1 with a minimum of 0 trees in 23 plots and a maximum of 11 trees ha−1.•The reduction in the NDVI values from March 2014 to March 2020 is statistically different from zero and significant.•The distribution of the NDVI values of the Wa CBD revealed areas of relatively high, low and insignificant clusters of NDVI values.•There is an increasing trend of the mean LST values from 2014 to 2020 with a sudden leap from 2017 to 2020.•Positive relationships exist between NDVI and LST for 2014, 2017 and 2020, signifying that the NDVI values for the Wa CBD are relatively small. Increasing physical infrastructure development influences the spatial distribution of vegetation and temperature in many cities around the globe. However, in emerging cities such as Wa Municipality in Ghana and elsewhere, research attention has focused on urban expansion or urban sprawl and the impacts thereof on the peri‑urban vegetation. Considering the importance of vegetation in regulating temperature, reducing windstorm, carbon sequestration and creating beauty, this paper concentrates on the threat posed by urban retrofitting activities on vegetation in open spaces in the Wa Central Business District (CBD). The study area was gridded into 1 ha plots using the Fishnet tool in ArcMap. One hundred and fifty-seven full plots and 75 plots of various sizes less than 1 ha were obtained from the fishnet gridding. One hundred and thirteen full plots were sampled for the counting of the trees. Normalized Difference Vegetation Index (NDVI) and Land Surface Temperature (LST) maps were prepared from 2014, 2017 and 2020 Landsat 8 satellite images. Point NDVI and LST values were extracted for 600 random points and used to analyze the spatial distribution using Global and Local Moran I tests. Two-sample t-test and Pearson correlation statistical tests were performed to assess the significance of any differences in the NDVI, LST and the tree density for 2014, 2017 and 2020. The results revealed that the average tree densities for 2017 and 2020 in the Wa CBD were 4 and 3 trees ha−1, respectively which were classified as very low. The spatial distribution of the NDVI values showed low, high and insignificant clusters. The NDVI values were within the range of 0.019–0.219. The clusters of high values were found around state institutional structures, where large open spaces existed while clusters of low values were found around the market, transport stations and densely populated areas where open spaces were very few. The land surface temperature trend revealed increasing minimum and maximum values. The minimum LST values were 32 °C, 33 °C and 36 °C in 2014, 2017 and 2020, respectively and the maximum LST values were 36 °C, 37 °C and 40 °C for 2014, 2017 and 2020, respectively. It is concluded that tree density and NDVI values in the CBD are low, signifying isolated trees and patches of vegetation in the area. Also, it was revealed that as greenness reduces LST increases. The Wa Municipal Assembly and the Regional Forestry Commission should intensify public education on tree planting and maintenance in the city.
  • Publisher: Elsevier B.V
  • Language: English
  • Identifier: ISSN: 2666-7193
    EISSN: 2666-7193
    DOI: 10.1016/j.tfp.2022.100261
  • Source: Directory of Open Access Journals
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