02159naa a2200277 a 450000100080000000500110000800800410001910000260006024501220008626000090020852013380021765000310155565000230158665300310160965300190164065300140165965300180167365300220169165300210171365300240173470000150175870000200177370000140179370000160180777300580182310499182019-10-30       2004    bl uuuu     u00u1 u    #d1 aCARRASCO-LETELIER, L.  aPreliminary study of prairies forested with Eucalyptus sp. at the northwestern Uruguayan soilsh[electronic resource]  c2004  aAbstract: The land cover change of Uruguayan Forestal Plan provoked biogeochemical changes on horizon Au1 of Argiudols; in native prairies which were replaced by monoculture Eucalyptus sp. plantation with 20 year rotations as trees. Five fields forested and six natural prairies were compared. The results not only show a statistical significant soil acidification, diminution of soil organic carbon, increase of aliphaticity degree of humic substances, and increase of affinity and capacity of hydrolytic activity from soil microbial communities for forested sites with Eucalyptus sp. but also, a tendency of podzolization and/or mineralization by this kind of land cover changes, with a net soil organic lost of 16.6 tons ha1 in the horizon Au1 of soil under Eucalyptus sp. plantation compared with prairie. Besides, these results point out the necessity of correction of the methodology used by assigned Uruguayan commission to assess the national net emission of greenhouse gases, since the mineralization and/or podzolization process detected in forested soil imply a overestimation of soil organic carbon. The biochemical parameters show a statistical significant correlation between the soil organic carbon status and these parameters which were presented as essential for the correct evaluation of Uruguayan soil carbon sink.  aCARBONO ORGANICO DEL SUELO  aDIOXIDO DE CARBONO  aCAMBIO COBERTURA DEL SUELO  aCARBON DIOXIDE  aEUCALIPTO  aEUCALYPTUS SP  aLAND COVER CHANGE  aSOIL CARBON SINK  aSOIL ORGANIC CARBON1 aEGUREN, G.1 aCASTIÑEIRA, C.1 aPARRA, O.1 aPANARIO, D.  tEnvironmental Pollution, 2004gv. 127, n. 1, p. 49-55