Responses of Dobera glabra and Eight Co-Occurring Species to Drought and Salinity Stress at a Savanna-Scrub Ecotone: Implications in the Face of Climate Change - Open Journal of Forestry

OJF > Vol.4 No.4, July 2014

Responses of Dobera glabra and Eight Co-Occurring Species to Drought and Salinity Stress at a Savanna-Scrub Ecotone: Implications in the Face of Climate Change ()

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DOI: 10.4236/ojf.2014.44039 3,227 Downloads 4,671 Views Citations

Author(s)

Aster Gebrekirstos, Demel Teketay, R. Mitlöhner

Affiliation(s)

Department of Crop Science and Production, Botswana College of Agriculture, Gaborone, Botswana.
Georg-August University of G?ttingen, Burckhardt-Institute of Tropical Silviculture and Forest Ecology,G?ttingen, Germany.
World Agroforestry Centre, Nairobi, Kenya; Georg-August University of G?ttingen, Burckhardt-Institute of Tropical Silviculture and Forest Ecology,G?ttingen, Germany.

ABSTRACT

To quantify the resistance of different co-occurring species to drought and osmotic stress (salinity stress), plant water (Ψ) and osmotic (Ψ_p) potentials were measured during the dry season. We applied a pressure chamber and cryoscopy to measure Ψ and Ψ_p, respectively. The species revealed a wide range of responses to water stress (-0.83 to -5.8 MPa) and osmotic stress (-1.3 to -3.2 MPa) and not all plants fit closely into one or the other category. Evergreen species tended to have lower Ψ than deciduous species. Notably, Dobera glabra, well known as drought indicator tree in the region, showed the lowest Ψ (up to -5.8 MPa) and Ψ_p (-3.2 MPa). This indicates its outstanding drought and osmotic stress tolerance and explains its ability to thrive in drought prone areas and years. The recent expansion of A. oerfota and A. mellifera in the study area could be related to their tolerance of osmotic stress, which may imply a trend of soil salinization. The division of plant responses into categories or strategies can be valuable aid to understanding long-term plant survival and distribution, monitor site condition and predict the direction of future changes.

KEYWORDS

Drought Tolerance, Reforestation, Domestication, Plant Water Relation, Adaptation, Acacia Woodlands, Ethiopia, Agroforestry

Share and Cite:

Gebrekirstos, A. , Teketay, D. and Mitlöhner, R. (2014) Responses of Dobera glabra and Eight Co-Occurring Species to Drought and Salinity Stress at a Savanna-Scrub Ecotone: Implications in the Face of Climate Change. Open Journal of Forestry, 4, 327-337. doi: 10.4236/ojf.2014.44039.

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