J. A. Mullah

• Doctor of Philosophy
• Researcher at Kenya Forestry Research Institute

Cherangany Hills Forest contains high levels of tree species diversity and endemism and is in critical need of conservation and restoration. Little is known about natural regeneration dynamics of isolated forest fragments forming the Cherangany, or the potential for human action to aid recovery of lost structures and functions following deforestati...

The Lefkovitch stage specific matrix population models are divided into discrete stage classes defined by a growth variable such as size, height and diameter at breast height for trees. In matrix model, the deterministic matrix projection models are used to estimate growth rate, stable size distribution, reproductive values, and sensitivities of th...

Modeling of invasive species using stage based matrix methods can be exploited to understand population dynamics of plants using stage based Leftkovitch matrix models. This study reviewed and extended the stage based matrix incorporating invasion variables of invasive Cestrum aurantiacum across different forest types, ecological zones and altitudes...

Guidelines on rehabilitation of degraded forests

Prunus africana has been severely exploited for its valuable products rendering it unstable and at risk of extinction. Studies were therefore carried out on its regeneration density and population structure across different human disturbance gradients in South West Mau Forest (SWMF) Kenya. Four study sites with {undisturbed, low, moderate and high}...

Whether invasion of introduced plant species may be aided by certain community properties is poorly understood for species-rich ecosystems, such as tropical montane forests. In Kenya, the non-native tree Fraxinus pennsylvanica has invaded degraded montane forests. We used generalized linear mixed models to examine the relative importance of differe...

In recent years, there have been considerable efforts to restore degraded tropical montane forests through active restoration using indigenous tree species. However, little is known about how these species used for restoration influence other species. In this study, two potential restoration species, Albizia gummifera and Neoboutonia macrocalyx, ar...

Cultivation of annual crops in the initial stage of reforestation has been commonly practiced in the tropics. In recent decades, however, cultivation of such areas has been discontinued, resulting in widespread abandoned settlements. In this article we used a former forest village settlement in Kenya, which had been cleared, cultivated and then aba...