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Management of bushland vegetation using rainwater harvesting in eastern Kenya.

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dc.contributor.author Kaarakka, Vesa
dc.date.accessioned 2011-07-28T13:13:47Z
dc.date.available 2011-07-28T13:13:47Z
dc.date.issued 1996
dc.identifier.citation Acta Forestalia Fennica. 1996. 253: 1-93. fi
dc.identifier.issn 0001-5636
dc.identifier.uri http://hdl.handle.net/10138/27293
dc.description.abstract Microcatchment water harvesting (MCWH) improved the survival and growth of planted trees on heavy soils in eastern Kenya five to six years after planting. In the best method, the cross-tied furrow microcatchments, the mean annual increments (MAI; based on the average biomass of living trees multiplied by tree density and survival) of the total and usable biomass in Prosopis juliflora were 2787 and 1610 kg ha-1 a-1 respectively, when the initial tree density was 500 to 1667 trees per hectare. Based on survival, the indigenous Acacia horrida, A. mellifera and A. zanzibarica were the most suitable species for planting using MCWH. When both survival and yield were considered, a local seed source of the introduced P. juliflora was superior to all other species. The MAI in MCWH was at best distinctly higher than that in the natural vegetation (163­307 and 66­111 kg ha-1 a-1 for total and usable biomass respectively); this cannot satisfy the fuelwood demand of concentrated populations, such as towns or irrigation schemes. The density of seeds of woody species in the topsoil was 40.1 seeds m-2 in the Acacia-Commiphora bushland and 12.6 seeds m-2 in the zone between the bushland and the Tana riverine forest. Rehabilitation of woody vegetation using the soil seed bank alone proved difficult due to the lack of seeds of desirable species. The regeneration and dynamics of woody vegetation were also studied both in cleared and undisturbed bushland. A sub-type of Acacia-Commiphora bushland was identified as Acacia reficiens bushland, in which the dominant Commiphora species is C. campestris. Most of the woody species did not have even-aged populations but cohort structures that were skewed towards young individuals. The woody vegetation and the status of soil nutrients were estimated to recover in 15­20 years on Vertic Natrargid soils after total removal of above-ground vegetation. fi
dc.language.iso en fi
dc.publisher The Society of Forestry in Finland - The Finnish Forest Research Institute fi
dc.subject aridiset alueet fi
dc.subject metsitys fi
dc.subject vesitalous fi
dc.subject Prosopis juliflora fi
dc.subject Acacia fi
dc.subject sadevesi fi
dc.subject kasvillisuus fi
dc.subject pensaat fi
dc.subject drylands, Kenya, land rehabilitation, rainwater harvesting, seed bank, vegetation dynamics fi
dc.title Management of bushland vegetation using rainwater harvesting in eastern Kenya. fi
dc.type Artikkeli fi
dc.identifier.laitoskoodi SMS fi
dc.subject.ysa Afrikka fi
dc.subject.ysa Kenia fi

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