41Tian, H., J.M. Mellilo, D.W. Kicklighter, A.D. McGuire, J.V.K.Helfrich III, B. Moore III & C. V"or"osmarty. 1998. Effect ofinteranual climate variability on carbon storage in Amazonianecosystems. Nature 396: 664-667.Uhl, C. & R. Buschbacher. 1985. A disturbing synergism betweencattle-ranch burning practices and selective tree harvesting inthe eastern Amazon. Biotropica 17(4): 265-268.Uhl, C. & J.B. Kauffman. 1990. Deforestation, firesusceptibility, and potential tree responses to fire in theEastern Amazon. Ecology 71(2): 437-449.Van Schaik, C.P. & E. Mirmanto. 1985. Spatial variation in thestructure and literfall of Sumatran rainforest. Biotropica 17:196-205.Van Wambeke, A. 1978. Properties and potentials of soils in theAmazon Basin. Interciencia 3(4): 233-241.Veríssimo, A., P. Barreto, M. Matos, R. Tarifa & C. Uhl. 1992.Logging impacts and prospects for sustai<strong>na</strong>ble forest ma<strong>na</strong>gementin an old Amazonian frontier: The case of Paragomi<strong>na</strong>s. ForestEcology and Ma<strong>na</strong>gement 55: 169-199.Vieira, L.S. 1975. Manual da Ciência <strong>do</strong> <strong>Solo</strong>. Editora AgronômicaCeres, São Paulo, SP. 464 p.Vieira, L.S. & M.N.F. Vieira. 1983. Manual de Morfologia eClassificação de <strong>Solo</strong>s. Editora Agronômica Ceres, São Paulo, SP.319 p.Walker, B.H., P. Lavelle & W. Weischet. 1987. Yurimaguastechnology. BioScience 37(9): 638-640.Walkley, A. & I.A. Black. 1934. An exami<strong>na</strong>tion of the Degtjareffmethod for determining soil organic matter and a proposedmodification of the chromic acid titration method. Soil Science37: 29-38.Webster C.C. & P.N. Wilson. 1980. Agriculture in the Tropics,2nd. ed. Longman, Lon<strong>do</strong>n, Reino Uni<strong>do</strong>. 640 p.Young, A. 1976. Tropical Soils and Soil Survey. CambridgeUniversity Press, Cambridge, Reino Uni<strong>do</strong>. 468 p.Zagatto, E.A.C., A.C. Jacintho, B.F. Reis, F.J. Krug, F.H.Bergamin, L.C.R. Pessenda, S. Moratti & M.F. Gine. 1981. Manualde Análises de Plantas e Águas Empregan<strong>do</strong> Sistemas de Injeção deFluxo. Centro de Energia Nuclear <strong>na</strong> Agricultura/Universidade de
São Paulo (CENA/USP), Piracicaba, São Paulo, SP. 45 p.42