Planning tree species diversification in Kenya based on differences in tree species composition between farms. II. Analysis of tree niches. Article Received: 13 May 2004 Accepted: 30 September 2005 DOI:
10.1007/s10457-005-3824-z Cite this article as: Kindt, R., Van Damme, P., Simons, A.J. et al. Agroforest Syst (2006) 67: 229. doi:10.1007/s10457-005-3824-z Abstract
Concerns exist about the limited diversity of tree species in agricultural landscapes. Complete tree inventories were carried out on 201 farms from four villages in western Kenya to establish whether significant differences in tree species composition existed between farms, and if so their magnitude and implications for new introductions and plantings. Novel types of ordination using the Hellinger ecological distance and polynomial Redundancy Analysis indicated wide heterogeneity between farms with respect to tree species composition of five niches, including homestead, cropland, fallow, woodlot, and external boundary (
p ≤ 0.05). Multiple regression analysis confirmed the ordination results using the abundance of dominant species as the response variable. The relationship between location and species composition differed with those of two previous surveys. Methodological differences in sampling intensity, locations and time of sampling between these surveys could have caused the difference. The maps of spatial distribution of compositional types provided in the previous surveys were not confirmed, whereas villages were found to contain several farms with a species composition that was not typical of their village. Meaningful results about the species composition of a landscape should include several farms per village and use a sampling grid finer than 5×5 km 2. Keyword Diversification Domestication Hellinger distance Landscape Ordination Redundancy analysis References Asner, G.P., Vitousek, P.M. 2005 Remote analysis of biological invasion and biogeochemical change Proc. Natl. Acad. Sci. 102 4383 4386 PubMed CrossRef Google Scholar Atta-Krah, K., Kindt, R., Skilton, J.N., Amaral, W. 2004 Managing biological and genetic diversity in tropical agroforestry Agroforest. Syst. 61 183 194 CrossRef Google Scholar Beentje, H.J. 1994Kenya Trees, Shrubs and Lianas National Museums of Kenya Nairobi 722 Google Scholar Bradley, P.N. 1991Woodfuel, Women and Woodlots Macmillan Education Ltd London and Basingstoke 338 Google Scholar Bradley, P.N., Chavangi, N., Gelder, A. 1985 Development research and energy planning in Kenya Ambio 14 228 236 Google Scholar Di Falco, S., Perrings, C. 2003 Crop genetic diversity, productivity and stability of agroecosystems. A theoretical and empirical investigation Scot. J. Polit. Econ. 50 207 216 CrossRef Google Scholar Dorward, A., Poole, N., Morrison, J., Kydd, J., Urey, I. 2003 Markets, institutions and technology: missing links in livelihoods analysis Dev. Policy Rev. 21 319 332 CrossRef Google Scholar Garrity, D.P. 2004 Agroforestry and the achievement of the Millennium Development Goals Agroforest. Syst. 61 5 17 CrossRef Google Scholar Harmand, J.M., Donfack, P., Njiti, C.F. 2003 Tree-root systems and herbaceous species-characteristics under tree species introduced into grazing lands in subhumid Cameroon Agroforest. Syst. 59 131 140 CrossRef Google Scholar Harvey, C.A., Haber, W.A. 1999 Remnant trees and the conservation of biodiversity in Costa Rican pastures Agroforest. Syst. 44 37 68 CrossRef Google Scholar
Hayek L.-A.C. and Buzas M.A. 1997. Surveying Natural Populations. Columbia University Press, New York. xvi, pp. 563.
Huang, W., Luukkanen, W., Johanson, S., Kaarakka, V., Raisanen, S., Vihemaki, H. 2002 Agroforestry for biodiversity conservation of nature reserves: functional group identification and analysis Agroforest. Syst. 55 65 72 CrossRef Google Scholar Kaya, M., Kammesheidt, L., Weidelt, H.-J. 2002 The forest garden system of Saparua islandCentral MalukuIndonesia and its role in maintaining tree species diversity Agroforest. Syst. 54 225 234 CrossRef Google Scholar Kindt, R. 1997Local Perceptions on Tree Propagation and Domestication – Results from a Survey in Western Kenya Int. Centre Res. Agroforest. Nairobi 45 Google Scholar Kindt, R., Damme, P., Simons, A.J., Beeckman, H. 2006 Planning tree species diversification in Kenya based on differences in tree species composition between farms I. Analysis of tree uses Agroforestry Systems 67 215 228 Google Scholar Kindt, R., Simons, A.J., Damme, P. 2004 Do farm characteristics explain differences in tree species diversity among western kenyan farms? Agroforest. Syst. 63 63 74 Google Scholar Kristensen, M., Balslev, H. 2003 Perceptions, use and availability of woody plants among the Gourounsi in Burkina Faso Biodivers. Conserv. 12 1715 1739 CrossRef Google Scholar Lauriks, R. 1996Onderzoek naar veranderingen in landgebruik in West-Kenya met behulp van luchtfoto-interpretatie Ghent University Ghent 125 Google Scholar Lauriks, R., Wulf, R., Carter, S.E., Niang, A. 1999 A methodology for the description of border hedges and the analysis of variables influencing their distribution: a case study in western Kenya Agroforest. Syst. 44 69 86 CrossRef Google Scholar Leakey, R.R.B., Simons, A.J. 1998 The domestication and commercialization of indigenous trees in agroforestry for the alleviation of poverty Agroforest. Syst. 38 165 176 CrossRef Google Scholar Legendre, P., Gallagher, E.D. 2001 Ecologically meaningful transformations for ordination of species data Oecologia 129 271 280 CrossRef Google Scholar Legendre, P., Legendre, L. 1998Numerical Ecology Elsevier Science BV Amsterdam 853 Google Scholar Loreau, M., Naeem, S., Inchausti, P., Bengtsson, J., Grime, J.P., Hector, A., Hooper, D.U., Huston, M.A., Raffaelli, D., Schmid, B., Tilman, D., Wardle, D.A. 2001 Biodiversity and ecosystem functioning: current knowledge and future challenges Science 294 804 807 PubMed CrossRef Google Scholar
Magurran A.E. 1988. Ecological Diversity and its Measurement. Princeton University Press, Princeton, pp. x+179.
Makarenkov, V., Legendre, P. 2002 Nonlinear redundancy analysis and canonical correspondence analysis based on polynomial regression Ecology 83 1146 1161 CrossRef Google Scholar McNeely, J.A. 2004 Nature vs. nurture: managing relationships between forests, agroforestry and wild biodiversity Agroforest. Syst. 61 155 165 CrossRef Google Scholar
Mathsoft I. 1999. S-Plus 2000 User's Guide. MathSoft Inc., Seattlepp. xii+558.
Quinn, G., Keough, M. 2002Experimental Design and Data Analysis for Biologists Cambridge University Press Cambridge 520 Google Scholar Rojas, L., Godoy, C., Hanson, P., Kleinn, C., Hilje, L. 2001 Hopper (Homoptera: Auchenorrhyncha) diversity in shaded coffee systems of TurrialbaCosta Rica Agroforest. Syst. 53 171 177 CrossRef Google Scholar Simons, A.J., Leakey, R.R.B. 2004 Tree domestication in tropical agroforestry Agroforest. Syst. 61 167 181 CrossRef Google Scholar Wezel, A., Bender, S. 2003 Plant species diversity of homegardens of Cuba and its significance for household food supply Agroforest. Syst. 57 39 49 CrossRef Google Scholar