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The steady decline in agrobiodiversity is not only a significant threat to the genetic stability of the rural agroecosystems but also places a huge impediment to the realization of global food security. Climate change and decline in arable land is forcing subsistence farmers to abandon the less productive but well-adapted local crops for the newer short term and drought-tolerant crops decimating agrobiodiversity further. This study sought to establish the on-farm species and genetic diversity status among the family farming systems of semiarid areas of Eastern Kenya and effect on food security, agrobiodiversity management strategies, their perception of climate change, and climate change coping strategies. Structured questionnaires were administered to 92 active farmers in Embu, Kitui, and Tharaka Nithi Counties of Eastern Kenya. On-farm diversity, socio-economic factors, and their impact on agrobiodiversity were determined. Possible correlations were established using Spearman’s Rank Correlation Coefficient. Remarkably, 26 crop species were recorded where legumes and cereals were dominant. According to the Shannon–Wiener Diversity index ( H ′), Tharaka Nithi County recorded the highest legumes and cereals diversity indices of 3.436 and 3.449, respectively. Food shortage was reported by over 50% of the respondents in the study area. The existence of weaker adaptive measures in response to climate change was evident. Family farming systems that had higher crop diversification and integrated livestock rearing in their farms were more food secure. Improved mitigation to climate change and diversification of farming systems among the smallholder farms is essential not only in boosting the food security but also in establishment of sustainable farming systems resilient to climate change.

Agrobiodiversity and perceived climatic change effect on family farming systems in semiarid tropics of Kenya