Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/17036
Title: Degradation impacts on riparian forests of the lower Mearim river, eastern periphery of Amazonia
Authors: Silva, Roberto Lima da
Leite, Márcio F.A.
Muniz, Francisca Helena
Souza, Luis Augusto Gomes de
Moraes, Flávio Henrique Reis de
Gehring, Christoph
Keywords: Biomass
Carbon
Conservation
Ecosystems
Erosion
Global Warming
Kinetics
Nitrogen Fixation
Restoration
Rivers
Vegetation
Biological Nitrogen Fixations
Carbon Stocks
Fabaceae
Montrichardia
Riverine Forest
Structural Composition
Forestry
Allometry
Biomass
Carbon Emission
Carbon Sequestration
Degradation
Denitrification
Ecosystem Function
Ecosystem Structure
Functional Role
Global Warming
Herb
Nitrogen Fixation
Nutrient Availability
Open Water
Peripheral Region
Riparian Forest
Vegetation Structure
Biomass
Carbon Dioxide
Degradation
Forests
Indicators
Amazonia
Brasil
Mearim River
Fabaceae
Montrichardia
Montrichardia Arborescens
Montrichardia Linifera
Issue Date: 2017
metadata.dc.publisher.journal: Forest Ecology and Management
metadata.dc.relation.ispartof: Volume 402, Pags. 92-101
Abstract: We describe degradation impacts on biomass, structural and functional composition of riparian forests of the Mearim river, eastern periphery of Amazonia, based on 40 transects from open water to terra firme and covering 4 degradation levels. Biomass was high (306.3 Mg ha−1) in original mature forests (MF), and 92.3% lower in strongly degraded (SD) sites. This suggests disproportionally high CO2-emissions via riparian forest degradation and calls for their preferential conservation and restoration to contain global warming. Degradation affected vegetation structure, especially plant size distribution, whereas overall plant abundance did not differ between degradation levels. ‘Aninga’ (Montrichardia arborescens and M. linifera) forms a conspicuous vegetation component in the aquatic zone, with 12.6% biomass and 58.4% abundance shares, relatively constant up to mid-level degradation but significantly lower in SD. Aninga's forefront position breaks the kinetic energy of waves and currents, making it ideal for erosion-control, we establish allometric equations for aninga biomass estimation. Erosion caused land-loss in the aquatic and semiaquatic sections of degraded sites. The biomass share of potentially N2-fixing Fabaceae was significantly higher in both aquatic (41.4%) and semiaquatic (44.8%) zones than in terra firme (6.3%). High denitrification N-losses in alternately aerobe-anaerobe zones could reduce N-availability and give N2-fixing legumes a competitive edge; we therefore recommend N2-fixing legumes for riparian forest restoration. We find low to moderate changes of vegetation indicators up to mid-level degradation, as opposed to systematically differing SD, pointing to a critical degradation threshold beyond which dysfunctionality impedes riparian ecosystem functioning. © 2017 Elsevier B.V.
metadata.dc.identifier.doi: 10.1016/j.foreco.2017.07.019
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