LAND USE AND LANDSCAPE STRUCTURAL CHANGES IN THE ECOREGIONS OF GHANA

Abstract

In recent years, land use(LU) and landscape structure in eco-regions around the world have been faced with enormous pressures, from rapid population growth to urban sprawl. A preliminary account of changes in land cover (LC) and landscape structure in the eco-regions of Ghana is missing from the academic and research literature. The study therefore provides a preliminary assessment of the changing (LU) and landscape structure in the eco-regions of Ghana, identifying the causes and assessing their impact on land-based resources, and on urban and agricultural development. LU/LC maps produced from 30m resolution Landsat TM5 in 1990 and ETM+ + + in 2000 were classified into dominant land cover types (LCTs) and used to survey the changing landscape of Ghana. LC-change map preparation was done with change detection extension “Ver¨anderung” (v3) in an ArcGIS 10.1 environment. At the class level,Patch Analyst version 5.1 was used to calculate land use (LU) statistics and to provide landscape metrics for LU maps extracted from the satellite imagery. The results showed that commonly observed LCCs in the eco-regions of Ghana include conversion of natural forest land to various forms of cultivated lands, settlements, and open land, particularly in closed and open forest and savannah woodland. The dominant LU types in the eco-regions of Ghana are arable lands, which increased by 6168.98 km2 2 2. Forest and plantation LCTs decreased in area and were replaced by agricultural land, forest garden,and open land. Afforestation rarely occurred except in the rainforests. The mean patch size (MPS), a measure of fragmentation, was generally reduced consistently from 1990 to 2000 in all the eco-regions. Similar results that indicated increased fragmentation were an increased number of patches (NumP) and the Shannon diversity index (SDI). Habitat shape complexity inferred from mean shape index (MSI) decreased in all eco-regions except for rain forest and wet evergreen. The SDI and Shannon evenness index (SEI) showed that habitat diversity was highest in the coastal savannah and the deciduous forest eco-regions. The main drivers of changes in the LUs and landscape structure are demand for land and land-based natural resources to support competing livelihoods and developmental activities in the different eco-regions.