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Tree diversity across different tropical agricultural land use types
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
Number of Authors: 3
2017 (English)In: Agriculture, Ecosystems & Environment, ISSN 0167-8809, E-ISSN 1873-2305, Vol. 240, 92-100 p.Article in journal (Refereed) Published
Abstract [en]

A recent trend in conservation biology is not only to focus on protected areas of natural vegetation but also on the management of agricultural landscapes, since these landscapes are considered to be-of vital importance for overall landscape biodiversity both through the opportunity for species to thrive there and as conduits for inter-patch dispersal. Since trees are considered to be key structures to enhance biodiversity in agricultural landscapes, we need to understand what factors regulate their occurrences. Farmers choices will decide the composition of land-uses and the associated densities and composition of trees. We compared tree density and tree species composition across eight different land use types replicated in ten agricultural landscapes in relatively humid climates of mid-altitudes (1500-2500 m asl) in Ethiopia. In each landscape five transects of 1 km divided into 50 plots of 20 x 20 m were surveyed for woody plants. Annual crop plots had a low tree density (of trees >10 cm DBH) (6 per ha), but since it generally was the most abundant land use type altogether, many tree species were still found there (4-29 per transect in the different landscapes). Most tree species had their highest relative occurrence in the perenial crops land-use type and among the different perenial crop types, plots with coffee were more species rich than plots with khat (Catha edulis) (a stimulant crop increasing in frequency); plots with Eucalyptus trees were intermediate. A few species were more associated with grazing areas and homegardens indicating that a combination of land-uses enhances the overall species diversity in these agricultural landscapes. However, if the trend of increasing areas of khat and Eucalyptus would lead to decreases in shade coffee there is a risk for severe erosion of tree density and species richness across these landscapes with cascading effects on associated biodiversity.

Place, publisher, year, edition, pages
2017. Vol. 240, 92-100 p.
Keyword [en]
Agroecology, Agroforestry, Coffee, Isolated trees, Khat, Land use, Tree diversity
National Category
Agricultural Science, Forestry and Fisheries Biological Sciences Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-142693DOI: 10.1016/j.agee.2017.01.042ISI: 000398645900010OAI: oai:DiVA.org:su-142693DiVA: diva2:1093890
Available from: 2017-05-08 Created: 2017-05-08 Last updated: 2017-05-08Bibliographically approved

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Hylander, Kristoffer
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