<i>Boswellia</i> and <i>Commiphora</i> Species as a Resource Base for Rural Livelihood Security in the Horn of Africa: A Systematic Review

The dryland vegetation and particularly the Acacia-Commiphora woodlands support the livelihoods of approximately 52 million rural households in the Horn of Africa. Aromatic resins are valuable non-wood forest products (NWFPs) derived from Boswellia and Commiphora species in the drylands of this region. The study seeks to answer the following main questions: &ldquo;What are the ecological and livelihood roles of resin producing species, and the role that people have in either degrading or restoring these ecosystems?&rdquo; &ldquo;Who are the participants in frankincense and myrrh production, processing, and trade, and how do these people interact?&rdquo; &ldquo;What is the current and potential future economic impact of frankincense and myrrh production and trade at the household level?&rdquo; &ldquo;What are the barriers to enhanced economic outcomes?&rdquo; The study involves the use of PRISMA method&mdash;a systematic methodology to identify, select and analyze the recent literature on aromatic resins in relation to such factors as socio-economic situation, livelihood security, value chain, climate change adaptation, ecology and sustainable development in the Horn of Africa. Systematic identification of publications was conducted using several sources, including but not limited to electronic databases for literature search. Web of Science, Social Science Citation Index and Google Scholar and various scientific journals were investigated using search terms and restrictions. A total of 991 references were retrieved, but literature only published between 2003 to 2017 was selected, which led to the use of 51 works for full-text assessment. The results indicate that of the 51 selected studies, 45% focused on ecology and sustainable management, 31% on economic contribution and livelihood security, 20% on production and value chain development, and 4% on climate change adaptation and mitigation. It could be concluded that farmers&rsquo; adoption of Boswellia and Commiphora species as economic tree crops in the Horn of Africa has a distinct role in biodiversity conservation and climate change adaptation by contributing to the sustainability of ecosystem functioning as well as improving household incomes and the rural livelihood security in general, and thereby facilitating poverty alleviation.