author = "Smith, Marielle N. and Stark, Scott C. and Taylor, Tyeen C. and 
                         Ferreira, Mauricio L. and Oliveira, Eronaldo and Restrepo-Coupe, 
                         Natalia and Chen, Shuli and Woodcock, Tara and Santos, Darlisson 
                         Bentes dos and Alves, Luciana F. and Figueira, Michela and 
                         Camargo, Plinio B. de and Oliveira, Raimundo C. de and 
                         Arag{\~a}o, Luiz Eduardo Oliveira e Cruz de and Falk, Donald A. 
                         and McMahon, Sean M. and Huxman, Travis E. and Saleska, Scott R.",
          affiliation = "{Michigan State University} and {Michigan State University} and 
                         {University of Arizona} and {Universidade de S{\~a}o Paulo (USP)} 
                         and {Universidade Federal do Oeste do Par{\'a} (UFOPA)} and 
                         {University of Arizona} and {University of Arizona} and 
                         {University of Arizona} and {Centro Universt{\'a}rio Luterano 
                         Santarem (CEULS ULBRA)} and {University of California Los Angeles} 
                         and {Universidade Federal do Oeste do Par{\'a} (UFOPA)} and 
                         {Universidade de S{\~a}o Paulo (USP)} and {Embrapa Amazonia 
                         Oriental} and {Instituto Nacional de Pesquisas Espaciais (INPE)} 
                         and {University of Arizona} and {Smithsonian Environm Research 
                         Center} and {University of California Irvine} and {University of 
                title = "Seasonal and drought-related changes in leaf area profiles depend 
                         on height and light environment in an Amazon forest",
              journal = "New Phytologist",
                 year = "2019",
               volume = "222",
               number = "3",
                pages = "1284--1297",
                month = "May",
             keywords = "Amazon forest, climate change, El Nino drought, forest canopy 
                         structure, leaf area, LiDAR remote sensing, phenology.",
             abstract = "Seasonal dynamics in the vertical distribution of leaf area index 
                         (LAI) may impact the seasonality of forest productivity in 
                         Amazonian forests. However, until recently, fine-scale 
                         observations critical to revealing ecological mechanisms 
                         underlying these changes have been lacking. To investigate 
                         fine-scale variation in leaf area with seasonality and drought we 
                         conducted monthly ground-based LiDAR surveys over 4 yr at an 
                         Amazon forest site. We analysed temporal changes in vertically 
                         structured LAI along axes of both canopy height and light 
                         environments. Upper canopy LAI increased during the dry season, 
                         whereas lower canopy LAI decreased. The low canopy decrease was 
                         driven by highly illuminated leaves of smaller trees in gaps. By 
                         contrast, understory LAI increased concurrently with the upper 
                         canopy. Hence, tree phenological strategies were stratified by 
                         height and light environments. Trends were amplified during a 
                         2015-2016 severe El Nino drought. Leaf area low in the canopy 
                         exhibited behaviour consistent with water limitation. Leaf loss 
                         from short trees in high light during drought may be associated 
                         with strategies to tolerate limited access to deep soil water and 
                         stressful leaf environments. Vertically and environmentally 
                         structured phenological processes suggest a critical role of 
                         canopy structural heterogeneity in seasonal changes in Amazon 
                         ecosystem function.",
                  doi = "10.1111/nph.15726",
                  url = "http://dx.doi.org/10.1111/nph.15726",
                 issn = "0028-646X",
                label = "isi 2019-05-24 SmithSTFORCWSAFCOAFMHS:2019:SeDrCh",
             language = "en",
           targetfile = "Smith_et_al-2019-New_Phytologist.pdf",
        urlaccessdate = "22 abr. 2021"