author = "Arag{\~a}o, Luiz Eduardo and Williams, Mathew",
                title = "Leaf area index measurements at Caxian{\~a}o forest and at 
                         Bragan{\c{c}}a mangrove in Par{\'a} State",
                 year = "2002",
         organization = "International LBA Scientific Conference, 2.",
             keywords = "ESTUDOS INTEGRADOS DO MEIO AMBIENTE, Floresta Caxiuan{\~a} (PA), 
                         Amaz{\^o}nia (Regi{\~a}o), carbon budgets.",
             abstract = "Leaf area index (LAI)is a major control on land surface exchange 
                         rates of energy and carbon. Field measurement of LAI is critical 
                         both for parametrizing models for scaling up leaf gas exchange to 
                         the canopy level and for use in calibrating remote sensing 
                         information on canopy structure. In this study, we characterized 
                         LAI in three sites in the primary rain forest of Caxiuan{\~a} 
                         National Forest, and at a mangrove forest on the coast near 
                         Bragan{\c{c}}a, Par{\'a} State. The data collection occurred 
                         during a field campaign in November 2001. We collected data with a 
                         pair of LAI-2000 canopy analyzers (LI-COR). In Caxiuan{\~a} 
                         forest, we sa grid. obtained the vertical distribution of LAI for 
                         each Caxiuan{\~a} forest site by recording LAI at successive 
                         levels on canopy access towers. In the mangrove forest, we 
                         collected forty samples at 5 m spacing near the eddy flux tower. 
                         Results from Caxiuan{\~a} showed that mean LAI was varied 
                         linearly from 4.64 at 2 m to 2.57 at 30 m height. There was a 
                         similar pattern at the Esecaflor plot, which varied from 4.58 at 2 
                         m to 2.01 at 30 m. The tower site had higher LAI values than the 
                         first two plots, with a LAI average of 5.70. The LAI profile at 
                         the tower site varied non-linearly, from 5.57 at 2 m to 1.1 at 30 
                         m height. Compared to the rain forest, the mangrove site had low 
                         LAI values (2.73), reflecting the lower density of trees, and also 
                         the occurrence of tide channels. The two experimental plots at 
                         Caxiuan{\~a} forest have similar patterns of horizontal and 
                         vertical LAI distribution and these patterns seem to be different 
                         from tower site. The mangrove forest site had distinctly different 
                         characteristics from the rain forest, reflected in low LAI values. 
                         With these data, we can now examine how differences in C and 
                         energy exchange in mangrove and rain forest, as recorded by eddy 
                         covariance, are related to differences in canopy structure.",
  conference-location = "Manaus, BR",
      conference-year = "7-10 July 2002",
           copyholder = "SID/SCD",
                label = "10323",
             language = "en",
         organisation = "LBA Central Office (CPTEC/INPE) LBA Regional Office in Manaus 
           targetfile = "aragao_leaf.pdf",
        urlaccessdate = "27 jan. 2021"