The effect of charcoal production and other land uses on diversity, structure and regeneration of woodlands in a semi-arid area in Kenya

Harun M. Kiruki*, Emma H. van der Zanden, Peter Gikuma-Njuru, Peter H. Verburg

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

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Abstract

Woodlands in Kenya are under pressure from agriculture, livestock keeping and a host of timber and non-timber forest uses, including charcoal production. However, the exact influence of charcoal production and other anthropogenic factors on different dimensions of woodlands is still unknown. We examined the effect of charcoal production and different other land uses on woodland structure, species composition, biomass and regeneration in a woodland area in Kenya. Information collected from 71 sample plots (50m × 20m) and from a recent land cover map was used to classify the woodland area into ten land use categories based on land cover, charcoal production intensity, grazing presence and land ownership. The results show that species diversity, tree density and biomass decreased with increasing intensity of land use, with agriculture and charcoal production being the leading causes. The influence of land cover was confirmed by the significant differences in diameter size class distributions (p < 0.001) and density (p = 0.01) between farmlands, transitional woodlands and woodlands. Redundancy analysis (RDA) of species abundance also clearly separated the various land uses. Charcoal production intensity caused significant differences on diameter size class distributions (p = 0.02) and stem density (p = 0.002). The results of land ownership are less pronounced. Overall, our results suggest the need of integrated land use management in order to balance the various land uses and ensure sufficient regeneration of woodland species valuable for the livelihood of the inhabitants and the ecological values of the region.
Original languageEnglish
Pages (from-to)282-295
Number of pages14
JournalForest Ecology and Management
Volume391
Early online date24 Feb 2017
DOIs
Publication statusPublished - 1 May 2017

Funding

This study was supported by the Ms Grietje Wille Legacy under the ASALI (A Sustainable Approach to Livelihood Improvements) Project, a joint cooperation between VU University, the Netherlands and SEKU University, Kenya. Additional support was obtained from the European Research Council under the European Union's Seventh Framework Programme ERC Grant Agreement no. 311819 (GLOLAND). We thank Dr. Julia Schindler of VU University and Dr. Kariuki Chege of SEKU for their invaluable advice. We also thank two anonymous reviewers whose comments greatly improved this manuscript. We also thank Festus Kakuma for organizing field logistics. The authors declare no conflict of interest.

FundersFunder number
SEKU
SEKU University
European Research Council
Vrije Universiteit Amsterdam
Seventh Framework Programme311819

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