Show simple item record Neeff, T. Lucas, Richard M. Freitas, C. C. Brondizio, E. S. dos Santos, Joao R. 2011-04-21T10:39:57Z 2011-04-21T10:39:57Z 2006
dc.identifier.citation Neeff , T , Lucas , R M , Freitas , C C , Brondizio , E S & dos Santos , J R 2006 , ' Area and age of secondary forests in Brazilian Amazonia 1978-2002: An empirical estimate ' Ecosystems , vol 9 , no. 4 , pp. 609-623 . , 10.1007/s10021-006-0001-9 en
dc.identifier.other PURE: 159095
dc.identifier.other dspace: 2160/6695
dc.identifier.uri en
dc.description Neeff, T., Lucas, R.M., dos Santos, J.R., Brondizio, E.S., Freitas, C.C. (2006). Area and age of secondary forests in Brazilian Amazonia 1978-2002: An empirical estimate. Ecosystems, 9: 609-623 Sponsorship: CNPq (Conselho Nacional de Desenvolvimento Cientifico e Technologico) support (grant 382660/02-1) en
dc.description.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 re mote-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 1978-2002 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 de tailed maps of secondary-forest age generated for seven sites in the Brazilian Legal Amazon. The area-age distribution was then specified from mean age by a distribution assumption. Over the period 1978-2002, 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 in creased from 4.4 to 4.8 years. We generated a time series of secondary-forest area fractions and suc cessional stages that provides wall-to-wall cover age 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 2 5-year period. en
dc.format.extent 15 en
dc.language.iso eng
dc.relation.ispartof Ecosystems en
dc.title Area and age of secondary forests in Brazilian Amazonia 1978-2002: An empirical estimate en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.contributor.institution Quaternary Environmental Change Group en
dc.description.status Peer reviewed en

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