Degradation impacts on riparian forests of the lower Mearim river, eastern periphery of Amazonia

Silva, Roberto Lima da; Leite, Márcio Fernandes Alves; Muniz, Francisca Helena; Souza, Luiz Augusto Gomes de; Moraes, Flávio Henrique Reis; Gehring, Christoph

doi:10.1016/j.foreco.2017.07.019

Cited by 13 publications

(7 citation statements)

References 59 publications

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“…Productivity of riparian vegetation is notably influenced by the interplay between water availability [15], soil anoxia occurring as a result of flooding or proximity to the water table [16,17] or nutrient-rich sediment brought in during floods [18]. Disturbances related to flooding and erosion [19], beavers [20], livestock [21], or anthropogenic disturbances related to agriculture and forestry [22][23][24] notably reduce vegetation biomass. The aforementioned factors also influence the type of vegetation that establishes in one place, which in turn determines potential biomass storage, for example through tree longevity [18].…”

Section: Introductionmentioning

confidence: 99%

What Factors Shape Spatial Distribution of Biomass in Riparian Forests? Insights from a LiDAR Survey over a Large Area

Huylenbroeck

Latte

Lejeune

et al. 2021

Forests

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Riparian ecosystems are home to a remarkable biodiversity, but have been degraded in many regions of the world. Vegetation biomass is central to several key functions of riparian systems. It is influenced by multiple factors, such as soil waterlogging, sediment input, flood, and human disturbance. However, knowledge is lacking on how these factors interact to shape spatial distribution of biomass in riparian forests. In this study, LiDAR data were used in an individual tree approach to map the aboveground biomass in riparian forests along 200 km of rivers in the Meuse catchment, in southern Belgium (Western Europe). Two approaches were tested, relying either on a LiDAR Canopy Height Model alone or in conjunction with a LiDAR point cloud. Cross-validated biomass relative mean square error for 0.3 ha plots were, respectively, 27% and 22% for the two approaches. Spatial distribution of biomass patterns were driven by parcel history (and particularly vegetation age), followed by land use and topographical or geomorphological variables. Overall, anthropogenic factors were dominant over natural factors. However, vegetation patches located in the lower parts of the riparian zone exhibited a lower biomass than those in higher locations at the same age, presumably due to a combination of a more intense disturbance regime and more limiting growing conditions in the lower parts of the riparian zone. Similar approaches to ours could be deployed in other regions in order to better understand how biomass distribution patterns vary according to the climatic, geological or cultural contexts.

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Section: Introductionmentioning

confidence: 99%

What Factors Shape Spatial Distribution of Biomass in Riparian Forests? Insights from a LiDAR Survey over a Large Area

Huylenbroeck

Latte

Lejeune

et al. 2021

Forests

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“…Riparian forests, despite their enormous ecological importance on a wide geographic scale, are suffering a severe reduction worldwide (Garófano-Gómez et al 2013;Nunes et al 2014;Shafroth et al 2016;Silva et al 2017). Although the Brazilian Federal Law 12651/2012 provides rules aimed at protecting the native vegetation, as presented in its preliminary section, it reduced the environmental liability of several areas that used to be protected.…”

Section: Discussionmentioning

confidence: 99%

“…From the point of view of biotic resources, the riparian forests create favourable conditions for the survival and maintenance of gene flow between populations of animal species that inhabit the riparian environments or even larger forest fragments that can be connected by them. From the point of view of the abiotic resources, the forests located near the bodies of water play important hydrological functions, including protection of the riparian zone, filtration of sediments and nutrients, control of the nutrient and chemical inputs to the courses of water, control erosion of channel banks and control of changes in the temperature of the aquatic ecosystem (Duringan & Silveira 1999;Naiman et al 2010;Silva et al 2017).…”

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confidence: 99%

The negative influences of the new brazilian forest code on the conservation of riparian forests

Silva¹,

Santos²,

Filho³

et al. 2017

European Journal of Ecology

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More than one million hectares of riparian forests were degraded or altered in Mato Grosso State (Brazil) up to 2009. The aim of the research is to set a comparative scenario to show differences in the quantification of environmental liabilities in riparian forest areas resulting from the change in native vegetation protection rules due to the transition between Laws 4771/65 and 12651/2012. Data collection took place in a marginal stretch of Vermelho River in Rondonópolis County, Mato Grosso State. The following data set was taken into consideration: aerial images derived from unmanned aerial vehicle, Rapid Eye satellite images and orbital images hosted at Google Earth. The spatial resolution of those images was compared. The aerial photos composed a mosaic that was photo-interpreted to generate land use and occupation classes. The riparian forest areas of a rural property were used as parameter, and their environmental situation was compared in 05 meter and 100 meter strips. Thus, by taking into consideration the current rules, 23,501 m2of area ceased to be an environmental liability within the riparian forest and became a consolidated rural area. According to the previous Forest Code, in a different scenario, that is, in a set of rural properties, the public authority would receive USD 68,600.00 in fines. The new Brazilian Forestry Code of 2012, which replaces the previous one made in 1965, exempts those responsible for rural property from regenerating previously deforested native vegetation - an obligation established by older Forest Code. We have shown that the new Forest Code has diminished the legal responsibility of the rural owners in relation to the maintenance of forest fragments in their properties.

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“…Esse resultado é compatível com resultado encontrado em áreas de florestas que ocorrem na APP, no leste da Amazônia, onde o desmatamento foi maior que nas áreas adjacentes (NUNES et al, 2015). Florestas em APP que têm maior degradação afetam fortemente a estrutura da vegetação e sua função ecossistêmica de proteção dos solos e estabilização dos processos erosivos (SILVA et al, 2017).…”

Section: Amostragemunclassified

Análise da evolução do desmatamento no estado do Acre, na bacia do rio Acre, em buffer e na sua APP, no período de 1997 a 2017 / Analysis of the evolution of deforestation in the state of Acre, in the Acre river basin, in buffer and in its APP, from 1997 to 2017

Azevedo¹

2021

Braz. J. Anim. Environ. Res.

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O objetivo deste artigo foi o de dimensionar a área desmatada até 2017 e a evolução do desmatamento nos últimos 20 anos (1997-2017), nos recortes espaciais do estado do Acre, bacia, buffer das florestas aluviais e APP do rio Acre e dentro dos recortes espaciais nas categorias territoriais de áreas públicas (Terras Indígenas, Unidades de Conservação e Projetos de Assentamento) e áreas privadas ou sem destinação. A bacia do rio Acre tem grande relevância socioeconômica e ambiental para o estado do Acre ao concentrar 66,6% de toda a população do estado, a ligação por via rodoviária com o Pacífico, a localização de 49 assentamentos para a pequena produção rural familiar e 36% do território em áreas protegidas. Os resultados das comparações entre os percentuais de áreas desmatadas e a evolução do desmatamento entre os recortes espaciais demonstraram que a APP e o buffer das florestas aluviais foram as de maior percentual de área desmatada, com 48% e 45%, respectivamente. A evolução do desmatamento dessas áreas próximas à margem do rio Acre também demonstra que este funcionou como um vetor do desmatamento. Os maiores responsáveis por esse padrão foram as áreas privadas ou sem destinação. As famílias dos pequenos produtores rurais, dos Projetos de Assentamento, tiveram um padrão de desmatar quanto mais distantes da margem, enquanto as populações tradicionais da Reserva Extrativista Chico Mendes e as populações indígenas da Terra Indígena Cabeceira do Rio Acre tiveram um padrão de desmatar quanto mais próximas à margem do rio. No caso das populações tradicionais com 47% da APP já desmatada, há indicação do processo de migração das comunidades do interior para a margem do rio. Apesar do grande passivo florestal a ser recuperado na APP, a tendência de desmatamento tem diminuído em todos os recortes espaciais e nas categorias territoriais das áreas privadas e sem destinação, nos projetos de assentamento e nas unidades de conservação.

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Degradation impacts on riparian forests of the lower Mearim river, eastern periphery of Amazonia

Cited by 13 publications

References 59 publications

What Factors Shape Spatial Distribution of Biomass in Riparian Forests? Insights from a LiDAR Survey over a Large Area

What Factors Shape Spatial Distribution of Biomass in Riparian Forests? Insights from a LiDAR Survey over a Large Area

The negative influences of the new brazilian forest code on the conservation of riparian forests

Análise da evolução do desmatamento no estado do Acre, na bacia do rio Acre, em buffer e na sua APP, no período de 1997 a 2017 / Analysis of the evolution of deforestation in the state of Acre, in the Acre river basin, in buffer and in its APP, from 1997 to 2017

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