@InProceedings{OmettoPTGCNSRPF:2019:ReNiFl,
               author = "Ometto, Jean Pierre Henry Balbaud and Pacheco, Felipe Siqueira and 
                         Tejada, Graciela and Gomes, Luciene and Cunha-Zeri, Gisleine da 
                         Silva and Nolasco, Camile Lanzarotti and Souza, Mariana de Almeida 
                         and Reis, Carla Roberta Gon{\c{c}}alves and Palandi, Jalusa 
                         Aparecida de L{\'e}o and Forti, Maria Cristina",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {University of Leeds} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Regional Nitrogen fluxes, an analysis for Latin America",
                 year = "2019",
         organization = "AGU Fall Meeting",
             abstract = "The impacts of the fast changes on the nitrogen cycle in LA and 
                         the interactions with other altered biogeochemical cycles are 
                         still open issues. Understanding the current impact of altered 
                         nitrogen fluxes to terrestrial and aquatic ecosystems, with key 
                         linkages to food and water security, ecosystems, and human health, 
                         is critical in the region. We developed spatial explicit maps of 
                         the components of the soil N budget, at 300 meters resolution 
                         aiming on supporting the identification of regions where 
                         inefficient nitrogen use may represent a threat to the production 
                         and environmental systems. The soil N budget was calculated 
                         considering the difference between total nutrient inputs and total 
                         outputs on agricultural and natural lands. Additionally, we 
                         investigated the Nutrient Use Efficiency (NUE) of the Latin 
                         America as an indicator of the performance of cropping system 
                         using the Partial Nitrogen Balance method. Agriculture strongly 
                         affects the nitrogen flux to the system by BNF in the Brazilian 
                         Cerrado and Argentinian Chaco, due to soybean production, while 
                         higher N-fertilizer application rate per area unit is observed 
                         mainly in Chile, Colombia and in the Southern region in Brazil. 
                         N-output through harvest are low in most agricultural regions in 
                         Latin American. Values >130 kg ha-1yr-1are observed only in the 
                         high productive areas of Brazil, mainly in the state of Mato 
                         Grosso and Goi{\'a}s. The spatial variability of the Nr emission 
                         and volatilization showed that production system in Chile and in 
                         Southeastern Brazil emit large amount of nitrogen to the 
                         atmosphere (max of 50.1 kg ha-1yr-1). Although these values are 
                         relatively high for Latin America, they are low when compared to 
                         other productive areas around the world where the emission can 
                         reach about 150 kg ha-1yr-1. The NUE values showed to be spatially 
                         heterogeneous in Latin America. Low NUE occurs in Chile, Colombia, 
                         Venezuela, Uruguay, in the Northeastern Brazil and Central 
                         America. Most part of the Argentinian Pampas and part of the 
                         Brazilian Cerrado showed to have high NUE with high risks of soil 
                         nutrient mining. The spatial analysisof the N budget components 
                         and NUE may contribute, as well, to support policy makers to act 
                         for a more sustainable food production system assuring food and 
                         water security in Latin America.",
  conference-location = "San Francisco, CA",
      conference-year = "09-13 dec.",
             language = "en",
           targetfile = "ometto_regional.pdf",
        urlaccessdate = "30 abr. 2024"
}