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Título: | Spatial and temporal dynamics of river channel migration and vegetation in central Amazonian white-water floodplains by remote-sensing techniques |
Autor: | Peixoto, Juliana Maerschner Aguiar Nelson, Bruce Walker Wittmann, Florian Karl |
Palavras-chave: | Alluvial Geomorphology Annual Rates Brazilian Amazonia C-sequestration Cecropia Forest Central Amazon Basin Channel Migration Flood-plains Free Channels Landsat Tm Local Biomass Old-growth Forest Open Water Point Bar River Channels River Confluence Sediment Loads Sensing Techniques Study Areas Study Sites Temporal Dynamics Vegetation Type Water Discharges Biomass Forestry Geomorphology Remote Sensing Vegetation Wetlands Rivers Alluvial Deposit Biomass Carbon Sequestration Channel Flow Colonization Floodplain Geomorphology Landsat Oil Trade Old-growth Forest Pioneer Species Remote Sensing River Discharge Spatial Variation Temporal Variation Vegetation Dynamics Wetland Basins Biomass Carbon Cecropia Chelation Forestry Mapping Plants Remote Sensing Rivers Wetlands Amazonia South America Cecropia |
Data do documento: | 2009 |
Revista: | Remote Sensing of Environment |
É parte de: | Volume 113, Número 10, Pags. 2258-2266 |
Abstract: | We investigated spatial and temporal migration of the Solimões, the Japurá, and the Aranapu River channels in western Brazilian Amazonia with Landsat TM imagery over a 21-year period. Additionally, we classified and monitored how channel migrations affect the distribution of pioneer vegetation and old-growth forest. The cloud-free study area was 153,032 ha - open water plus 3 km inland on each margin. The channel migration rates, expressed as percent dislocation of the open water body of the river year- 1, were lowest in the Japurá River (1.2%), and highest in the Aranapu channel (2.5%), the point bars at river confluence being the most affected landforms subject to geomorphic changes. Annual rates of lateral erosion and accretion of vegetated land along the three rivers were well-balanced. They averaged 0.79 and 0.83% of the cloud-free channel area over the 21 years. The Solimões River was more dynamic than the Japurá River, which can be traced to higher water discharge and sediment load. During the 21 years, the area covered by pioneer vegetation increased by 5.8% of the study area, while late-succession areas decreased by a similar amount (5.5%). According to local biomass estimates of the different vegetation types, these values suggest that C-releases by alluvial erosion would be much higher than C-sequestration caused by the creation of areas suitable for colonization by pioneer vegetation at our study site. © 2009 Elsevier Inc. All rights reserved. |
DOI: | 10.1016/j.rse.2009.06.015 |
Aparece nas coleções: | Artigos |
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