Research Article

Assessment of Land Cover and Land Use Change Dynamics in Kibwezi Watershed, Kenya

Table 2

LULC class and classification definitions.

Class nameDescription

Built-up landAreas characterized by close settlements for residential, industrial, commercial, and public service
Cropland (rainfed)Areas characterized by vegetation planted under rainfed conditions for the production of food, feed, or fibre. Crops include pigeon peas, green grams, cowpea, beans, maize, mango, and miraa (under irrigation). Field edges and uncultivated areas are dominated by Acacia Vachellia elatior sp.
Cropland (irrigated)Areas characterized by vegetation under irrigation for production of food, feed, or fibre. Main crops are tomatoes, maize, assorted vegetables, and mangoes
Cropland (perennial)Areas under rainfed condition for sisal production
Crops-shrubs/treesThese are areas characterized by woody vegetation (>50%) Acacia Vachellia elatior sp. as well as growing of crops under rainfed condition (<50%) pigeon peas, maize, and beans
Closed shrublandsAreas characterized by woody vegetation generally less than 6 m tall (>80%). Trees cover 5% and shrubs cover >80% and bare 60%. Dominant woody species are as in unit shrub grasslands (SG)
Open shrublandsAreas characterized by woody vegetation are generally less than 6 m tall (20–49%). Over 80% of the area is bare and very degraded due to lack of basal cover. The shrub cover ranges from 20 to 40%. Dominant woody species are as in unit SG
Shrub grasslandsAreas dominated by grasses and herbs (>60%) and some shrubs (<30%). The dominant grass species are Digitaria macroblephara, Chloris roxburghiana, and Sporobolus pellucidus, while the woody species are Commiphora campestris and, Acacia Vachellia elatior
Wooded shrublandsAreas dominated by shrubs with a tree cover of <20%. A very sparse herb layer is present only in a few places. Among the grasses are Enteropogon macrostachyus and Penicum coloratum, while the herbs are Triumfetta flavescens and Ipomea lapidosa. The dominant trees are Commiphora baluensis and Melia volkensii while shrubs are Cordia ovata and Croton dichogamus characterized by lava flows and rock outcrops
Riverine woodlandsThey are found along river alluvial plains with drainage channels (river valleys) covered by trees and shrubs. Acacia vachellia elatior is the dominant tree and forms a cover of 5–10%. Balanites aegytiaca and Salvadora persica (tooth brush). Dominant grasses are Pennisetum mezianum and Sprobolus helvolus. The areas are heavily grazed due to the proximity of many water holes in the riverbed