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Elucidating woody vegetation patterns in relation to soil and topography in tropical Africa : the case of Nech Sar National Park (Ethiopia)

Gatew M Shetie, Stefaan Dondeyne, Jan Nyssen UGent, Karen Vancampenhout and Jozef Deckers (2017) PLANT ECOLOGY AND EVOLUTION. 150(1). p.45-58
abstract
Background and aims - Although soils and topography are reported to be key factors determining vegetation patterns, there are very few studies on this topic in tropical Africa. Given the young nature of the soils of Nech Sar National park, we hypothesised that the woody vegetation would be related to both topsoil and subsoil characteristics. As topography also determines soil characteristics, we investigated whether soil and topography could be considered independently. Methods - Abundance of woody plant species was measured in 19 stratified randomly selected plots of 20 m x 20 m. At the centre of each plot a soil profile pit was dug and samples were taken from each horizon. Topographic characteristics were derived from a 30 m x 30 m digital elevation model. TWINSPAN and Detrended Correspondence Analysis (DCA) were used to identify major patterns in species composition. Factor Analysis was used to assess the variability of, and correlation between, the soil characteristics. Differences between the vegetation groups in-terms of stand and environmental characteristics was tested with the Maim-Whitney U test. DCA axes describing the major variation in vegetation patterns were correlated with soil and topographic characteristics. Results - Forest vegetation was found on Fluvisols and Gleyic Cambisols while bushland was found on Andosols and Vertic Cambisols. The vegetation gradient from forest to bushland (DCA-1) was correlated with both topsoil and subsoil characteristics reflecting parent material and alkalinity; these could however not be dissociated from topography. In contrast, variation both within the forest and the bushland (DCA-2) was not correlated with environmental characteristics. We attribute this variation to disturbances such as collection of firewood or logging, and to the absence of large browser or scarcity of wildfires. Conclusions - This study calls for giving equal attention to topsoil and subsoil for elucidating woody vegetation patterns. Though vegetation patterns vary with topography, a comprehensive understanding requires insights into soils.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
ALCELAPHUS-BUSELAPHUS-SWAYNEI, POPULATION STATUS, FOREST, SAVANNA, NITROGEN, PLAINS, IMPACT, BRAZIL, SITE, Riverine forest, Bushland, Fluvisols, Cambisols, Andosols, soil, characteristics, topographic characteristics, digital elevation model
journal title
PLANT ECOLOGY AND EVOLUTION
Plant Ecol. Evol.
volume
150
issue
1
pages
45 - 58
Web of Science type
Article
Web of Science id
000398878300005
ISSN
2032-3913
2032-3921
DOI
10.5091/plecevo.2017.1162
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
8520491
handle
http://hdl.handle.net/1854/LU-8520491
date created
2017-05-16 06:55:28
date last changed
2017-06-15 08:52:49
@article{8520491,
  abstract     = {Background and aims - Although soils and topography are reported to be key factors determining vegetation patterns, there are very few studies on this topic in tropical Africa. Given the young nature of the soils of Nech Sar National park, we hypothesised that the woody vegetation would be related to both topsoil and subsoil characteristics. As topography also determines soil characteristics, we investigated whether soil and topography could be considered independently. 
Methods - Abundance of woody plant species was measured in 19 stratified randomly selected plots of 20 m x 20 m. At the centre of each plot a soil profile pit was dug and samples were taken from each horizon. Topographic characteristics were derived from a 30 m x 30 m digital elevation model. TWINSPAN and Detrended Correspondence Analysis (DCA) were used to identify major patterns in species composition. Factor Analysis was used to assess the variability of, and correlation between, the soil characteristics. Differences between the vegetation groups in-terms of stand and environmental characteristics was tested with the Maim-Whitney U test. DCA axes describing the major variation in vegetation patterns were correlated with soil and topographic characteristics. 
Results - Forest vegetation was found on Fluvisols and Gleyic Cambisols while bushland was found on Andosols and Vertic Cambisols. The vegetation gradient from forest to bushland (DCA-1) was correlated with both topsoil and subsoil characteristics reflecting parent material and alkalinity; these could however not be dissociated from topography. In contrast, variation both within the forest and the bushland (DCA-2) was not correlated with environmental characteristics. We attribute this variation to disturbances such as collection of firewood or logging, and to the absence of large browser or scarcity of wildfires. 
Conclusions - This study calls for giving equal attention to topsoil and subsoil for elucidating woody vegetation patterns. Though vegetation patterns vary with topography, a comprehensive understanding requires insights into soils.},
  author       = {Shetie, Gatew M and Dondeyne, Stefaan and Nyssen, Jan and Vancampenhout, Karen and Deckers, Jozef},
  issn         = {2032-3913},
  journal      = {PLANT ECOLOGY AND EVOLUTION},
  keyword      = {ALCELAPHUS-BUSELAPHUS-SWAYNEI,POPULATION STATUS,FOREST,SAVANNA,NITROGEN,PLAINS,IMPACT,BRAZIL,SITE,Riverine forest,Bushland,Fluvisols,Cambisols,Andosols,soil,characteristics,topographic characteristics,digital elevation model},
  language     = {eng},
  number       = {1},
  pages        = {45--58},
  title        = {Elucidating woody vegetation patterns in relation to soil and topography in tropical Africa : the case of Nech Sar National Park (Ethiopia)},
  url          = {http://dx.doi.org/10.5091/plecevo.2017.1162},
  volume       = {150},
  year         = {2017},
}

Chicago
Shetie, Gatew M, Stefaan Dondeyne, Jan Nyssen, Karen Vancampenhout, and Jozef Deckers. 2017. “Elucidating Woody Vegetation Patterns in Relation to Soil and Topography in Tropical Africa : the Case of Nech Sar National Park (Ethiopia).” Plant Ecology and Evolution 150 (1): 45–58.
APA
Shetie, G. M., Dondeyne, S., Nyssen, J., Vancampenhout, K., & Deckers, J. (2017). Elucidating woody vegetation patterns in relation to soil and topography in tropical Africa : the case of Nech Sar National Park (Ethiopia). PLANT ECOLOGY AND EVOLUTION, 150(1), 45–58.
Vancouver
1.
Shetie GM, Dondeyne S, Nyssen J, Vancampenhout K, Deckers J. Elucidating woody vegetation patterns in relation to soil and topography in tropical Africa : the case of Nech Sar National Park (Ethiopia). PLANT ECOLOGY AND EVOLUTION. 2017;150(1):45–58.
MLA
Shetie, Gatew M, Stefaan Dondeyne, Jan Nyssen, et al. “Elucidating Woody Vegetation Patterns in Relation to Soil and Topography in Tropical Africa : the Case of Nech Sar National Park (Ethiopia).” PLANT ECOLOGY AND EVOLUTION 150.1 (2017): 45–58. Print.