<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">C Palm</style></author><author><style face="normal" font="default" size="100%">J Alegre</style></author><author><style face="normal" font="default" size="100%">Arvalo, L.</style></author><author><style face="normal" font="default" size="100%">Mutuo, P.K.</style></author><author><style face="normal" font="default" size="100%">Mosier, A.R.</style></author><author><style face="normal" font="default" size="100%">Coe, R.</style></author></authors><secondary-authors><author><style face="normal" font="default" size="100%">asb@cgiar.org</style></author></secondary-authors></contributors><titles><title><style face="normal" font="default" size="100%">Nitrous Oxide and Methane Fluxes In Six Different Land Use Systems in the Peruvian Amazon.</style></title><secondary-title><style face="normal" font="default" size="100%">Global Biogeochemical Cycles </style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">agro forestry</style></keyword><keyword><style  face="normal" font="default" size="100%">biogeochemical controls</style></keyword><keyword><style  face="normal" font="default" size="100%">Brazilian Amazon</style></keyword><keyword><style  face="normal" font="default" size="100%">carbon</style></keyword><keyword><style  face="normal" font="default" size="100%">Costa Rica</style></keyword><keyword><style  face="normal" font="default" size="100%">eastern Amazonia</style></keyword><keyword><style  face="normal" font="default" size="100%">fertilizers</style></keyword><keyword><style  face="normal" font="default" size="100%">forest</style></keyword><keyword><style  face="normal" font="default" size="100%">humid tropics</style></keyword><keyword><style  face="normal" font="default" size="100%">methane production</style></keyword><keyword><style  face="normal" font="default" size="100%">Pasture</style></keyword><keyword><style  face="normal" font="default" size="100%">plantation</style></keyword><keyword><style  face="normal" font="default" size="100%">secondary forest</style></keyword><keyword><style  face="normal" font="default" size="100%">shifting cultivation</style></keyword><keyword><style  face="normal" font="default" size="100%">soil emissions</style></keyword><keyword><style  face="normal" font="default" size="100%">western Puerto Rico</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2002</style></year><pub-dates><date><style  face="normal" font="default" size="100%">November, 2002</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.mendeley.com/research/nitrous-oxide-methane-fluxes-six-different-land-systems-peruvian-amazon-1/</style></url></web-urls></urls><publisher><style face="normal" font="default" size="100%">American Geophysical Union</style></publisher><volume><style face="normal" font="default" size="100%">16</style></volume><pages><style face="normal" font="default" size="100%">13</style></pages><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">This study from the Peruvian Amazon includes monthly nitrous oxide and methane fluxes from two cropping systems, three tree-based systems, and a 23-year secondary forest control. Average N2O fluxes from the cropping systems were two to three times higher than the secondary forest control (9.1 g N m-2 h-1), while those of the tree-based systems were similar to the secondary forest. Increased fluxes in the cropping systems were attributed to N fertilization, while fluxes from the tree-based systems were related to litterfall N. Average CH4 consumption was reduced by up to half that of the secondary forest (-30.0 g C m-2 h-1) in the tree-based and low-input cropping systems. There was net CH4 production in the high-input cropping system. This switch to net production was a result of increased bulk density and increased soil respiration resulting in anaerobic conditions. Reduced rates of N2O emissions, similar CH4 consumption, and high C sequestration rates in these tree-based systems compared with mature forests, coupled with the large area of these systems in the humid tropics, may partially offset the past effects of deforestation on increased atmospheric trace gas concentrations. In contrast, cropping systems with higher N2O emissions, substantially reduced CH4 consumption or even net CH4 emissions, and little C sequestration exacerbate those effects.</style></abstract><issue><style face="normal" font="default" size="100%">4</style></issue><section><style face="normal" font="default" size="100%">1073</style></section></record></records></xml>