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The role of complex agroforestry systems in the conservation of forest tree diversity and structure in southeastern Ghana

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Abstract

The role of different agroforestry systems in the conservation of plant diversity and forest structure has not been directly compared in many agricultural dominated landscapes. In this study, we investigated tree diversity and forest structure in a complex agroforestry landscape traditionally grown for cocoa and mixed food crops and compared these to the natural forest in southeastern Ghana. The study was carried out using 36 25 m × 25 m plots. There was significant difference [95% Confidence Interval (95% CI)] in the native forest/non-crop tree species richness between the natural forest and the agroforest farmlands but species richness was similar between the cocoa and mixed food crops agroforests. The density of native forest/non-crop trees was significantly higher (P < 0.05) in the natural forest but similar between cocoa and mixed food crops agroforest. Similarly, the basal area of native forest/non-crop trees was significantly higher (P < 0.05) in the natural forest but comparable between cocoa and food crops agroforest. Of the 20 most abundant native forest/non-crop trees recorded, 12 of them showed significant responses (P < 0.05) to land use change with nine of the species significantly abundant in the natural forest relative to the agroforest systems. Eighteen native forest/non-crop trees species in the agroforestry systems were commonly recorded as being used; 100% of them being used as fuel wood with 83.3 and 77.8%, respectively, used as medicines and materials. The findings of this study suggests that although complex agroforestry systems are a poor substitute for the natural forest the heterogeneous mosaic landscape in which complex agroforestry forms part can be strategically managed to maximize the benefits of both sustainable agriculture production and conservation of plant diversity by acting as buffer between protected areas and intensively managed areas.

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Acknowledgements

We are most grateful to the people of Adjeikrom for their hospitality during fieldwork. Thanks also to Earthwatch Institute (Europe) and Nature Conservation Research Centre (NCRC) for partial funding of the fieldwork. We are thankful to Mr. J. Y. Amponsah at the Department of Botany for assistance with tree identification.

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Authors and Affiliations

  1. Department of Botany, University of Ghana, P.O. Box LG 55, Legon, Ghana

    Alex Asase

  2. Environmental Science Programme, University of Ghana, P.O. Box LG 71, Legon, Ghana

    Daniel A. Tetteh

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  1. Alex Asase
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  2. Daniel A. Tetteh
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Correspondence to Alex Asase.

 Appendix 1

 Appendix 1

Appendix 1 Native forest/non-crops tree species, their families and density (individuals ha−1) in a complex agroforestry landscape in southeastern Ghana
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Asase, A., Tetteh, D.A. The role of complex agroforestry systems in the conservation of forest tree diversity and structure in southeastern Ghana. Agroforest Syst 79, 355–368 (2010). https://doi.org/10.1007/s10457-010-9311-1

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