Influence of topographic aspect on floristic diversity, structure and treeline of afromontane cloud forests in the Bale Mountains, Ethiopia

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• 作者：Eshetu Yirdaw ; Mike Starr ; Mesele Negash ; Fantaw Yimer
• 关键词：Afromontane ; Aspect ; Cloud forests ; Ethiopia ; Floristic diversity
• 刊名：Journal of Forestry Research
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：26
• 期：4
• 页码：919-931
• 全文大小：837 KB
• 参考文献：Amare T, Hergarten C, Hurni H, Wolfgramm B, Yitaferu B, Gebre Selassie Y (2013) Prediction of soil organic carbon for ethiopian highlands using soil spectroscopy. ISRN Soil Sci 2013:1-1. http://?dx.?doi.?org/-0.-155/-013/-20589 . http://?www.?hindawi.?com/?journals/?isrn/-013/-20589/-/span> Accessed 14 Jan 2014
  Badano EI, Cavieres LA, Molina-Montenegro MA, Quiroz CL (2005) Slope aspect influences plant association patterns in the Mediterranean matorral of central Chile. J Arid Environ 62:93-08CrossRef
  Bader MY, Ruijten JA (2008) A topography-based model of forest cover at the alpine tree line in the tropical Andes. J Biogeogr 35:711-23CrossRef
  Bale CL, Williams JB, Charley JL (1998) The impact of aspect on forest structure and floristics in some Eastern Australian sites. For Ecol Manag 110:363-77CrossRef
  Barnes BV, Zak DR, Denton SR, Spur SH (1998) Forest ecology, 4th edn. Wiley, New York, p 792
  Bekele T (1994) Vegetation ecology of remnant Afromontane forests of the central plateau of Shewa, Ethiopia. Acta Phytogeogr Suec 79:1-9
  Brunori A, Nair PKR, Rockwood DL (1995) Performance of two Eucalyptus species at different slope positions and aspects in a contour-ridge planting system in the Negev desert of Israel. For Ecol Manag 75:41-8CrossRef
  Bussmann R (1997) The forest vegetation of the Harenna escarpment (Bale province, Ethiopia)—syntaxonomy and phytogeographical affinities. Phytocoenologia 27(1):1-3CrossRef
  Dalen L, Hofgaard A (2005) Diffrentail regional tree dynamics in the Scandes mountains. Antarct Alp Res 37(3):284-96CrossRef
  Danby R (2003) A multiscale study of tree-line dynamics in southwestern yukon. Arctic 56(4):427-36CrossRef
  Edwards S, Demissew S, Hedberg I (1997) Flora of Ethiopia and Eritrea: Hydrocharitaceae to Arecaceae, vol 6. The National Herbarium, Addis Ababa University, Addis Ababa, p 586
  FAO (2005) New_LocClim: local climate estimator (version 1.10). Environment and natural resources, working paper number 20 (CD-ROM). FAO, Rome
  Fekedulegn D, Hicks RR, Colbert JJ (2003) Influence of topographic aspect, precipitation and drought on radial growth of four major tree species in an Appalachian watershed. For Ecol Manag 177:409-25CrossRef
  Fekedulegn D, Colbert JJ, Rentch JS, Gottschalk KW (2004) Aspect differences in vegetation, soil and microclimatic characteristics of an Appalachian watershed. Castanea 69(2):92-08CrossRef
  Foster P (2001) The potential negative impacts of global climate change on tropical montane cloud forests. Earth-Sci Rev 55:73-06CrossRef
  Frazer GW, Canham CD, Lertzman KP (1999) Gap light analyzer (GLA), version 2.0: imaging software to extract canopy structure and gap light transmission indices from true-colour fisheye photographs, users manual and program documentation. Millbrook, Simon Fraser University, Burnaby, British Columbia, and the Institute of Ecosystem Studies
  Friis I, Demissew S, Breugel P (2010) Atlas of the potential vegetation of Ethiopia. Det Kongelige Danske Videnskabernes Selskab, Copenhagen, p 306
  Gallardo-Cruz JA, Perez-Garcia EA, Meave JA (2009) β-diversity and vegetation structure as influenced by slope aspect and altitude in a seasonally dry tropical landscape. Landscape Ecol 24:473-82CrossRef
  Gaston KJ (1994) Rarity. Population and community biology series 13. Chapman and Hall, London, p 205CrossRef
  Grace J, Berninger F, Nagy L (2002) Impacts of climate change on tree line. Ann Bot 90:537-44PubMedCentral CrossRef PubMed
  Grieser J, Gommes R, Bernardi M (2006) New LocClim—the local climate estimator of FAO. Geophys Res Abstr 8:2
  Grubb PJ (1997) Control of forest growth and distribution on wet tropical mountains: with special reference to mineral nutrition. Annu Rev Ecol Syst 8:83-07CrossRef
  Hamilton LS (1995) Mountain cloud forest conservation and research: a synopsis. Mt Res Dev 15(3):259-66CrossRef
  Hedberg I, Edwards S (1989) Flora of Ethiopia, vol 3. Pittosporaceae to Araliaceae. The National Herbarium, Addis Ababa and Uppsala University, Uppsala, p 659
  Hedberg I, Edwards S, Nemomissa S (2003) Flora of Ethiopia and Eritrea, vol 4(2). Part 1: Apiaceae to Dipsacaceae. The National Herbarium, Addis Ababa and Uppsala University, Uppsala
  Hillman JC (1988) The Bale mountain national park area, southeast Ethiopia, and its management. Mt Res Dev 8(2/3):253-58CrossRef
  Hitimana J, Kiyiapi JL, Njunge JT (2004) Forest structure characteristics in disturbed and undisturbed sites of Mt. Elgon moist lower montane forest, western Kenya. For Ecol Manag 194:269-91CrossRef
  Holland PG, Steyn DG (1975) Vegetational responses to latitudinal variations in slope angle and aspect. J Biogeogr 2:179-83CrossRef
  Johansson MU, Fetene M, Malmer A, Granstr?m A (2012) Tending for cattle: traditional fire managment in Ethiopian montane heathlands. Ecol Soc 17(3):19
  Kebede M, Kanninen M, Yirdaw E, Lemenih M (2013) Vegetation structural characteristics
• 作者单位：Eshetu Yirdaw (1)
  Mike Starr (1)
  Mesele Negash (2)
  Fantaw Yimer (2)
  
  1. Department of Forest Sciences, University of Helsinki, P.O. Box 27, 00014, Helsinki, Finland
  2. Wondo Genet College of Forestry and Natural Resources, Hawassa University, P.O. Box 128, Shashemene, Ethiopia
  
• 刊物主题：Forestry;
• 出版者：Springer Berlin Heidelberg
• ISSN：1993-0607

文摘

We studied the influence of east and west aspects on floristic composition, diversity, structure and treeline of afromontane cloud forests at Rira in the Bale Mountains, southeast Ethiopia. In addition, we studied how aspect relates to and/or interacts with other topographic and edaphic factors in influencing vegetation diversity. Stratified systematic plot sampling was used to survey the floristic composition, diversity and structure of forests on east- and west-facing slopes. The sample plot size was 20 × 20 m and a total of 36 plots were inventoried. A total of 72 composite soil samples were collected and analysed. Woody species richness of the forest on the east-facing slope was 1.7 times higher than on the west-facing slope. Shannon, Simpson and Log-series alpha diversity indices and evenness of forests on the east-facing slope were significantly higher than on the west-facing slope. NMDS ordination indicated that the east- and west-facing slopes formed two clusters of species and aspect explained 55.2 % and 10.4 % of the variation in species richness and abundance, respectively. There was no significant difference between aspects in stand structure except in dominant height, which was higher on the east-facing slopes. There was significant interaction between aspect and elevation in influencing woody species diversity. The four plant community groups, which were identified using cluster and indicator species analysis were represented differently on the east and west aspects. The treeline on the east-facing slope (3352 m) was located about 110 m higher than on the west-facing slope (3240 m). Soil moisture deficiency was unlikely to be a limiting factor on either site. Near the equator, east–west aspect was shown to have considerable impact on floristic composition, diversity, structure, and treeline position of montane forests. Diurnal cloud movement patterns and its impact on microclimate of slope aspect should be taken into account in future studies of cloud forest diversity, structure, and treeline position. Keywords Afromontane Aspect Cloud forests Ethiopia Floristic diversity