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Tropentag, September 14 - 16, 2022, Prague

"Can agroecological farming feed the world? Farmers' and academia's views."


Effects of land use on tree species diversity in different agro-ecological zones of Ghana

Miracle Obeng1, Reginald Tang Guuroh2, Mathias Becker1, Shyam Pariyar1

1University of Bonn, Inst. Crop Sci. and Res. Conserv. (INRES) - Plant Nutrition, Germany
2Forestry Research Institute of Ghana (CSIR), Ghana


Abstract


The understanding of changes in plant species’ responses to the interactive effect of land use and climate is not only an important area of research, but could also inform on the effect of such interactions on the composition and structure of future plant biodiversity. We hypothesise that rainfall and land use affect the composition and diversity of tree species and soil fertility attributes. We investigated the effects of land use along an aridity gradient on the population structure and diversity of woody vegetation and on soil fertility attributes in Ghana. The study was performed in: i) the wet evergreen forest zone, ii) the moist semi deciduous forest zone and iii) the dry semi deciduous zone, following a gradient of increasing aridity. In each zone, we compared protected forest areas with the surrounding non-protected agriculturally used areas.
We applied a nested plot design for sampling data on woody vegetation. Two sampling sites were selected in each zone, and ten survey plots of 50 m × 20 m (0.1 ha) were randomly selected in each of the six site (60 observation plots in total). In each plots, composite soil samples from depths of 0-20 cm were taken for physico-chemical analyses.
The study revealed that protected forest areas displayed highest levels of tree taxonomic and functional diversity and more homogenous soil fertility attributes across plots and sites than in the cropland areas. Data analysis is in progress and the detailed results will be presented and discussed.


Keywords: Agriculture, climate change, diversification, ecosystem service, forestry, nutrient cycle, system shift


Contact Address: Miracle Obeng, University of Bonn, Inst. Crop Sci. and Res. Conserv. (INRES) - Plant Nutrition, 53115 Bonn, Germany, e-mail: s7mioben@uni-bonn.de


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