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Effects of land clearing and subsequent management on soil physical properties. Soil Sci Soc Am J 50:1379-84. 35. Eden MJ, Furley PA, McGregor DFM, Milliken W, Ratter JA. 1991. Effect of forest clearance and burning on soil properties in northern Roraima, Brazil. Fort Eco Manage 38:283-90. 36. Sanchez PA, Villachica JH, Bandy DE. 1983. Soil fertility dynamics after clearing a tropical rainforest in Peru. Soil Sci Soc Am J 47:1171-1178. 37. Desjardins T, Andreux F, Volkoff B, Cerri CC. 1994. Organic carbon and 13C contents in soils and soil size-fractions, and their changes due to deforestation and pasture installation in eastern Amazonia. Geoderma 61:103-118. 38. Verchot LV, Davidson EA, Cattanio JH, Ackerman IL, Erickson HE, Keller M. 1999. Land use change and biogeochemical controls of nitrogen oxide emissions from soils in eastern Amazonia. Global Biogeochem Cycles 13:31-46. 39. Nepstad DC, Moutinho PR, Markewitz D. 2001. 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