@Article{NeeffLucSanBroFre:2006:EmEs,
author = "Neeff, Till and Lucas, Richard M. and Santos, Jo{\~a}o Roberto
dos and Brondizio, Eduardo S. and Freitas, Corina Costa",
affiliation = "Biometry Department, University of Freiburg, Freiburg Breisgau,
Germany and Institute of Geography and Earth Sciences, University
of Wales, Aberystwyth, Ceredigion SY23 3DB, Wales, UK; and
Institute of Geography and Earth Sciences, University of Wales,
Wales, UK and Anthropological Center for Training and Research on
Global Environmental Change (ACT), Indiana University, Student
Building 331, Bloomington, IN 47405, USA and Anthropological
Center for Training and Research on Global Environmental Change
(ACT), Indiana University, Bloomington, USA",
title = "Area and age of secondary forests in Brazilian Amazonia 1978-2002:
an empirical estimate",
journal = "Agriculture, Ecosystems and Environment",
year = "2006",
volume = "9",
pages = "DOI: 10.1007/s10021--006--0001--9",
keywords = "SENSORIAMENTO REMOTO APLICADO {\`A} ECOSSISTEMAS TERRESTRES,
Amaz{\^o}nia (Regi{\~a}o), uso da terra, floresta, area-age
distribution, forest, age, land-use model, secondary forest,
succession.",
abstract = "In quantifying the carbon budget of the Amazon region, temporal
estimates of the extent and age of regenerating tropical forests
are fundamental. However, retrieving such information from remote-
sensing data is difficult, largely because of spectral
similarities between different successional stages and variations
in the reflectance of forests following different pathways of
regeneration. In this study, secondary-forest dynamics in
Brazilian Amazonia were modeled for the 19782002 period to
determine area and age on a grid basis. We modeled the area, age,
and age class distribution of secondary forests using empirical
relationships with the percentage of remaining primary forest, as
determined from large-area remote-sensing campaigns (the
Pathfinder and Prodes projects). The statistical models were
calibrated using detailed maps of secondary-forest age generated
for seven sites in the Brazilian Legal Amazon. The areaage
distribution was then specified from mean age by a distribution
assumption. Over the period 19782002, secondary-forest area was
shown to have increased from 29,000 to 161,000 km2 (that is, by a
factor of 5). The mean age increased from 4.4 to 4.8 years. We
generated a time series of secondary-forest area fractions and
successional stages that provides wall-to-wall coverage of the
Brazilian Amazon at a spatial resolution of 0.1 decimal degrees
(approximately 11 km). Validation against reference data yielded
root mean squared errors of 8% of the total area for estimate of
secondary-forest area and 2.4 years for mean secondary-forest age.
Using this approach, we provide the first published update on the
state of secondary forests in Amazonia since the early 1990s and a
time series of secondary-forest area over the 25-year period.",
copyholder = "SID/SCD",
issn = "0167-8809",
language = "en",
targetfile = "corinaartigo.pdf",
urlaccessdate = "06 maio 2024"
}