Resource Details

Effects of ground preparation and microenvironment on germination and natural regeneration of Juniperus procera and Afrocarpus gracilior in Ethiopia

Literature: Journal Articles

Sharew, H., Legg, C. J. & Grace, J. 1997, "Effects of ground preparation and microenvironment on germination and natural regeneration of Juniperus procera and Afrocarpus gracilior in Ethiopia", Forest Ecology and Environment, vol. 93, nos. 3, pp. 215-225.

Contact Info

Colin J. Legg, c.legg@ed.ac.uk

Affiliations

  • The University of Edinburgh, Insitute of Ecology and Resource Management

Link(s)

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Species Info

  • Afrocarpus gracilior
  • Juniperus procera

Description

  • This study assesses the net effect of seed supply and seedbed changes on germination and natural regeneration of J. procera and A. gracilior in the Afromontane forests of Ethiopia. In addition to the influences of canopy gap, ground vegetation cover, leaf litter, site preparation and seed dispersal on germination and natural regeneration.
  • For the assessment of these species 4 sites with relatively good natural regeneration and 1 site with no regeneration were selected subjectively. Plots were estalished for the recording of natural regeneration and microenvironment. Tree seedlings were counted and measurement of photosynthetic photon flux (PPF) transmission, litter depth and percentage cover of grasses, forbs and shrubs were sampled.
  • Artificial regeneration of J. procera increased significantly in percent germination and survival by raking, burning and cultivation. A. gracilior seeds increased slightly with raking, but were significantly decreased by burning and cultivation. Seedling height growth of both species was affected by ground preparation and significantly by raking. In addition, ground preparation had a highly significant effect on the natural regeneration of J. procera on tree stumps or partially burned logs but there was no sign of A. gracilior natural regeneration.
  • The authors conclude that management for the regeneration of J. procera should involve more complete disturbance of the forest floor to remove barriers for both rooting and seedling emergence aboveground. Clearcutting in narrow strips is recommended to provide adequate seed supply. Site preparation such as raking and controlled burning that exposes mineral soils are preferred.
  • In contrast, A. gracilior maybe favored by silvicultural treatments that provide minimum soil disturbance, but more research under field trials is required to ensure validity.

Geographical Region

  • East Africa
  • Country

  • Ethiopia
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