Journal of Arboriculture 31(5): September 2005 213 CONCLUSIONS The simple random sampling of the district was more appropriate to estimate the total number of trees and the number of trees per kilometer of sidewalk than the stratified random sample. However, the large coefficient of variation showed that the sampling distribution along the district was not uniform. We concluded that systematized sampling would be more appropriate than simple random sampling. The stratified random sampling did not represent the sampled universe in a reliable way. There is a need to establish other criteria for strata block grouping that differ from those used in this work. Stratification may not be a suitable method for urban forest analysis because of the multiplicity of variables and randomized factors that determine the presence of trees in a city that such sampling cannot express. LITERATURE CITED Chacalo, A., A. Aldama, and J. Grabinsky. 1994. Street tree inventory in México City. J. Arboric. 20(4):222–226. Cochran, W.G. 1977. Sampling Techniques (3rd ed.). Wiley, New York, NY. 428 pp. Couto, H.T.Z. 1994. Métodos de amostragem para avaliação de árvores de ruas. pp. 169–179. In Congresso Brasileiro de Arborização Urbana 2, Encontro Nacional Sobre Arborização Urbana 5, São Luis. Sociedade Brasileira de Arborização Urbana, São Luís, Brasil. Grey, G.W., and F.J. Deneke. 1978. Urban Forestry. Wiley, New York, NY. 279 pp. Jaeson, R., N. Bassuk, S., Schwager, and D. Headley. 1992. A statistical method for the accurate and rapid sampling of urban street tree populations. J. Arboric. 18(4):171–183. 1*Ph.D. in Plant Production Travessa Francisco Gobeth, 65 Piracicaba – SP/Brazil CEP: 13.418-030 2Master of Science in Plant Production, USP – ESALQ 3Professor of Department of Plant Production 4 Professor of Department of Forest Resources Universidade de São Paulo (USP) Escola Superior de Agricultura Luiz de Queiroz (ESALQ) C.P. 9, CEP: 13418-900 – Piracicaba, SP *Corresponding author: Ivan André Alvarez (iaalvare@ terra.com.br). Milano, M.S. 1994. Métodos de amostragem para avaliação de arborização de ruas, pp. 163–168. In Congresso Brasileiro de Arborização Urbana 2, Encontro Nacional Sobre Arborização Urbana 5, São Luis. Sociedade Brasileira de Arborização Urbana, São Luís, Brasil. Milano, M.S., O. Sarnowiski Filho, and J.A.M. Robaio. 1992. Estudo comparativo de unidades amostrais utilizadas para inventário quali-quantitativo da arborização de rua em Curitiba, pp. 343–350. In Encontro Nacional Sobre Arborização Urbana, 4, Vitória. Sociedade Brasileira Urbana, Vitória, Brasil. Pielou, E.C. 1975 Ecological Diversity. Wiley, New York, NY. ©2005 International Society of Arboriculture
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