@InProceedings{VonRandowAVTHBLMM:2010:DoSeFo,
               author = "Von Randow, Rita de C{\'a}ssia and Araujo, Alessandro and Von 
                         Randow, Celso and Tomasella, Javier and Hutjes, R W and Brasil, M 
                         T and Leal, L and Magina, Flavio Carvalho and Manzi, Antonio 
                         Ocimar",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and LBA, 
                         Instituto Nacional de Pesquisas da Amazonia, Manaus, Brazil and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and ESS-CC, Wageningen 
                         University, Guaratingueta, Netherlands and LBA, Instituto Nacional 
                         de Pesquisas da Amazonia, Manaus, Brazil and LBA, Instituto 
                         Nacional de Pesquisas da Amazonia, Manaus, Brazil and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and LBA, Instituto 
                         Nacional de Pesquisas da Amazonia, Manaus, Brazil",
                title = "Does secondary forest compensate the low evapotranspiration caused 
                         by conversion of forest to pasture?",
            booktitle = "P{\^o}steres",
                 year = "2010",
         organization = "The Meeting of the Americas.",
             keywords = "biosphere, atmosphere interactions, evapotranspiration, land.",
             abstract = "Forest to pasture conversion can lead to a decrease of 
                         precipitation induced by the decrease of evapotranspiration 
                         starting a positive feedback in the climate system. The 
                         accelerated deforestation rate suffered by Amazonian region is of 
                         global concern due to the importance of the Amazonia to the 
                         climate. Improve the understanding of the impact of deforestation 
                         in the hydrological cycle is of the highest importance. Nowadays, 
                         Amazonian landscape is no longer a homogeneous surface of pristine 
                         primary forest, but an heterogeneous irregular patches of pasture 
                         and agriculture plots of various sizes. Besides this, those 
                         patches were many times abandoned, creating opportunities for the 
                         regrowth of original vegetation (secondary forests). Impacts of 
                         fragmentation, and more specifically natural regrowth, on regional 
                         climate and hydrology are not well known. Previous studies pointed 
                         that the conversion of primary forest to pasture or agricultural 
                         crops affect the precipitation and runoff, and consequently 
                         evapotranspiration at micro scales, but this effect is not always 
                         detected at larger temporal and spatial scales. Few works 
                         suggested that the evaporative fraction of the secondary forest 
                         increases with the age of the forest in comparison with mature 
                         primary forests. Therefore, the objective of this study was to 
                         compare the evapotranspiration of one site of primary forest with 
                         one site of ~20 years old secondary forest in Central Amazonia, 
                         and to evaluate whether the secondary forest has a role on the 
                         resilience of the Amazon system compensating the effects of the 
                         deforestation on the water cycle. The latent heat flux of the 
                         secondary forest during the dry season was 29% higher than in the 
                         primary forest. During the wet season the secondary forest also 
                         presented 17% higher latent heat flux than in primary forest. The 
                         values of evapotranspiration were 4.28 mm day-1 for secondary 
                         forest against 3.32 mm day-1 for primary forest during the dry 
                         season, which represents a difference of around 1 mm day-1. During 
                         the wet season, the evapotranspiration for secondary forest was 
                         3.99 mm day-1 against 3.42 mm.day-1 for primary forest, resulting 
                         in a difference of around 0.57 mm day-1. The evaporative fraction 
                         during the dry season in the secondary forest was around 0.80 and 
                         in the primary forest was 0.70. During the wet season this 
                         difference was lower, 0.89 for secondary forest and around 0.82 
                         for primary forest. These results show that the difference on 
                         energy available for evapotranspiration is not the only cause of 
                         the higher evapotranspiration of the secondary forest in 
                         comparison with the primary forest in both dry and wet seasons. In 
                         conclusion, our study demonstrate that the secondary forest may 
                         play a relevant role in the Amazonia system, and confirm the 
                         urgent need of a better understanding of the role of this type of 
                         vegetation on a basin wide water and energy balance. Additionally, 
                         improvement of the representation of secondary vegetation on 
                         atmospheric models and in the analysis of soil-water-atmosphere 
                         interaction studies at regional and global scales.",
  conference-location = "Foz do Igua{\c{c}}u, BR",
      conference-year = "8-12 aug 2010",
             language = "en",
           targetfile = "RitavonRandow_does.pdf",
        urlaccessdate = "06 maio 2024"
}