Area and Age of Secondary Forests in Brazilian Amazonia 1978–2002: An Empirical Estimate

Neeff, Till; Lucas, Richard; Santos, João Roberto dos; Brondízio, Eduardo S.; Freitas, Corina da Costa

doi:10.1007/s10021-006-0001-9

Cited by 84 publications

(72 citation statements)

References 21 publications

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“…In contrast to much of the southern Amazon, where clearcuts often produce long-term pasturelands, in eastern and central Amazonia, clearcut areas are typically abandoned within 5 years after conversion to cattle pasture (Fearnside 2005). In the Brazilian Amazon, the area of secondary forest increased from 29,000 to 161,000 km 2 from 1978 to 2002 alone (Neeff et al 2006). These vast expanses of secondary forest will inevitably become a necessary element of conservation planning, particularly given that growth of secondary forests from abandoned pastures represents a significant way to offset carbon lost to deforestation in the Amazon (Nepstad et al 2009, Asner et al 2010.…”

Section: Methodsmentioning

confidence: 99%

Recovery of understory bird movement across the interface of primary and secondary Amazon rainforest

Powell

Stouffer

Johnson

2013

The Auk

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Section: Methodsmentioning

confidence: 99%

Recovery of understory bird movement across the interface of primary and secondary Amazon rainforest

Powell

Stouffer

Johnson

2013

The Auk

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“…Forty percent of this was in the state of Pará, where the Brazilian government's TerraClass mapping program identified over 165,000 km 2 of second-growth vegetation in 2010 ( Figure 1). Although some regenerating stands in older landscapes, such as in the northeast of Pará, can be over 50 years old, most second-growth forests in the Brazilian Amazon, as elsewhere, are relatively short-lived components of a landscape, with an average age of only five years in 2002 [18]. To provide context, we first briefly examine the legal framework governing environmental resources and second-growth forests across Brazil, before focusing on evolving governance structures of the state of Pará.…”

Section: Introductionmentioning

confidence: 99%

Challenges of Governing Second-Growth Forests: A Case Study from the Brazilian Amazonian State of Pará

Vieira

Gardner

Ferreira

et al. 2014

Forests

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Despite the growing ecological and social importance of second-growth and regenerating forests across much of the world, significant inconsistencies remain in the legal framework governing these forests in many tropical countries and elsewhere. Such inconsistencies and uncertainties undermine attempts to improve both the transparency and sustainability of management regimes. Here, we present a case-study overview of some of the main challenges facing the governance of second-growth forests and the forest restoration process in the Brazilian Amazon, with a focus on the state of Pará, which is both the most populous state in the Amazon and the state with the highest rates of deforestation in recent years. First, we briefly review the history of environmental governance in Brazil that has led to the current system of legislation governing second-growth forests and the forest restoration process in Pará. Next, we draw on this review to examine the kinds of legislative and operational impediments that stand in the way of the development and implementation of a more effective governance system. In particular, we highlight problems created by significant ambiguities in legal terminology and OPEN ACCESSForests 2014, 5 1738 inconsistencies in guidance given across different levels of government. We also outline some persistent problems with the implementation of legal guidance, including the need to understand local biophysical factors in order to guide an effective restoration program, as well as difficulties presented by access to technical assistance, institutional support and financial resources for the establishment and monitoring of both existing secondary forests and newly regenerating areas of forest. Whilst we focus here on a Brazilian case study, we suggest that these kinds of impediments to the good governance of second-growth forests are commonplace and require more concerted attention from researchers, managers and policy makers.

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“…De acordo com alguns estudos encontrados na literatura ( Odum, 1969;Moran et al, 2000;Nelson et al, 2000;Roberts et al, 2002;Neeff et al, 2006) O grande extensão da AML faz com que esta região seja um mosaico de muitos ambientes, não só físicos, mas também histórico-culturais e sócio-econômicos (Hurtienne, 2005). Assim, buscando representar a diversidade de formas de uso da terra e os agentes associados a esses usos, foi utilizado o mapa de estrutura agrária da Amazônia Legal (IBGE, 2007).…”

Section: Mapa De Ecorregiõesunclassified

“…Estimativas do total de área de vegetação secundária na AML foram realizadas através de métodos amostrais, considerando quase sempre um pequeno número de amostras, ou por medidas com base em dados de sensoriamento remoto de baixa resolução. Neeff et al (2006), criaram um modelo estatístico a partir de relações empíricas verificadas entre a ocorrência de vegetação secundária e a fração de floresta remanescente, inferindo para a AML em 2002, uma área total de floresta secundária de 161.000 km 2 com uma incerteza estimada de 8%. Esse estudo foi realizado a partir de estudos de caso realizados em sete áreas na Amazônia localizadas nos estados do Amazonas, Pará, Mato Grosso e Rondônia.…”

Section: Introductionunclassified

Estimativa de área de vegetação secundária na Amazônia Legal Brasileira

et al. 2010

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A vegetação secundária tem funções relevantes para os ecossistemas, tais como a fixação de carbono atmosférico, a manutenção da biodiversidade, o estabelecimento da conectividade entre remanescentes florestais, manutenção dos regime hidrológico e a recuperação da fertilidade do solo. O objetivo deste trabalho é, através de uma abordagem amostral, estimar a área ocupada por vegetação secundária na Amazônia Legal Brasileira (AML) em 2006. A amostragem se baseia em uma abordagem estratificada pelo grau de desflorestamento das cenas LANDSAT-TM que recobrem a AML. Foram selecionadas 26 cenas para o ano de 2006, distribuídas em sete estratos conforme o percentual de desflorestamento, nas quais foram mapeadas as áreas de vegetação secundária a partir de técnicas de classificação de imagens. Foi desenvolvido um modelo multivariado de regressão para estimar a área de vegetação secundária utilizando como variáveis independentes a área de desflorestamento, a área de hidrografia, a estrutura agrária, e área das unidades de conservação. A análise de regressão encontrou um R 2 ajustado de 0,84 , e coeficientes positivos para a proporção de hidrografia na imagem (2,055) e para a estrutura agrária (0,197), e coeficientes negativos para o grau de desflorestamento na imagem (-0,232) e para a proporção de Unidades de Conservação na imagem (-0,262 Estimation of secondary vegetation area in the Brazilian Legal Amazon ABSTRACTSecondary vegetation has many relevant functions to the ecosystems such as atmospheric carbon fixation , maintenance of biodiversity, establishment of connectivity among forest remnants, maintenance of hydrological regime, and restoration of soil fertility. The objective of this work is to estimate the area occupied by secondary vegetation in the Brazilian Legal Amazon (BLA) for 2006 using a sampling scheme. The sampling is based on a stratified approach according to the degree of deforestation observed in the 229 TM-Landsat scenes that cover the BLA. Thus, 26 scenes were selected for 2006 and distributed into seven strata, according to their degree of deforestation, in which secondary vegetation areas were mapped. A regression model was constructed to estimate secondary vegetation area in the remaining images using deforestation area, hydrographic area, agrarian structure , and area of conservation units, as independent variables. The regression analysis found an adjusted R 2 of 0.84 and positive coefficients for the proportion of hydrography in the image (2.055) and for the agrarian structure (0.197), while negative coefficients for the degree of deforestation in the image (-0.232) as well as for the proportion of Conservation Unity (-0.262

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Area and Age of Secondary Forests in Brazilian Amazonia 1978–2002: An Empirical Estimate

Cited by 84 publications

References 21 publications

Recovery of understory bird movement across the interface of primary and secondary Amazon rainforest

Recovery of understory bird movement across the interface of primary and secondary Amazon rainforest

Challenges of Governing Second-Growth Forests: A Case Study from the Brazilian Amazonian State of Pará

Estimativa de área de vegetação secundária na Amazônia Legal Brasileira

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