@InProceedings{AragãoWill:2002:LeArIn,
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
(INPA)",
targetfile = "aragao_leaf.pdf",
urlaccessdate = "01 maio 2024"
}