at Stellenbosch we're busy developing growth models for sustainability planning and carbon sequestration in woodlands together with colleagues from Namibia, Zambia and Mozambique. It's no direct human intervention modelling yet though the models might be used for certain questions in that sphere.
we have put some emphasis on these questions of human-nature-systems, starting from the field of forest management to the landscape perspective. For your case of African forests our expertise is limited, yet. But we have made some first steps, which might be promising for you. One of them focuses land use change with remote sensing tools. My colleague, Mengistie Kindu - also on ResearchGate - is working on this topic. He furthermore wants to link land use change with social-economic factors. Second, we have done some joint topics on silvicultural and forest management planning with our colleagues of the Institute of Forest Management from TUM (e.g. the project "Silvicultural contributions towards sustainable management and conservation of forest resources in the highlands of Ethiopia"). Furthermore, I could imagine that Jonathan Onyekwelu, a friend of our Institute, might have some good information or publication for you. See also the upcoming conference in April 2014: http://www.fchange2014.wzw.tum.de/.