Quaternary of the Pantanal, west-central Brazil

Assine, Mário Luís; Soares, Paulo

doi:10.1016/s1040-6182(03)00039-9

Cited by 190 publications

(186 citation statements)

References 11 publications

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“…The main period of subsidence resulting in the Pantanal wetland depression is related to the last compressional pulse of the Andes during the upper Plio-lower Pleistocene about 2.5 million years ago (Junk et al 2006). In addition, climatic changes during the Quaternary led to intermittent periods of large-scale flooding and severe droughts (Ab'Saber 1988; Assine and Soares 2004). In comparison, it is thought that floodplain forests in the Amazon basin have persisted at least since the early Paleocene (Kubitzki 1989).…”

Section: Discussionmentioning

confidence: 99%

Tree Species Composition, Structure, and Aboveground Wood Biomass of a Riparian Forest of the Lower Miranda River, Southern Pantanal, Brazil

et al. 2008

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The aboveground wood biomass (AWB) of tropical forests plays an important role in the global carbon cycle, and local AWB estimates provide essential data that enable the extrapolation of biomass stocks to ecosystem or biome-wide carbon cycle modelling. Few AWB estimates exist in Neotropical freshwater floodplains, where tree species distribution and forest structure depend on the height and duration of periodic inundations. We investigated tree species composition, forest structure, wood specific gravity, and AWB of trees ≥10 cm dbh in 16 plots totalling an area of 1 ha in a seasonally inundated riparian forest of the lower Miranda River, southern Pantanal, Brazil. The 443 tree individuals belonged to 46 species. Four species (Inga vera, Ocotea suaveolens, Tabebuia heptaphylla and Cecropia pachystachya) comprised more than 50% of the Total Importance Values (TIV), and floristic similarities between the plots averaged 38%. Although we detected an overall increase in species diversity correlated with decreasing flood levels, the most important tree species had almost identical distribution patterns Folia Geobot (2008) /ha), and the tree heights averaged 10.9±1.4 m. Multiplying the individual basal areas by individual tree heights and a form factor of 0.6, we estimated the aboveground wood volume (AWV) for each individual, and for each plot (24.4±11.7 m 3 , 391.1±188 m 3 /ha). Wood specific gravity (SG) varied between 0.39 g/cm 3 (Cecropia pachystachya) and 0.87 g/cm 3 (Tabebuia heptaphylla), with a stand level average of 0.63±0.12 g/cm 3 . Multiplying the individual AWV with species SG, we estimated the plot AWB to be 16.2±6.4 Mg (259.4±102 Mg/ha). This value is comparable to that reported for late-successional forest stands of Amazonian floodplain forests, and it is close to the worldwide tropical average AWB. Because tree heights in the present forest were comparatively low when compared to other Neotropical forests, we found that resprouting of stems accounted for comparatively high basal areas. We argue that stem resprouting is an adaptation of tree species originating in non-flooded Cerrado to the seasonal inundations of riparian forests.

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Section: Discussionmentioning

confidence: 99%

Tree Species Composition, Structure, and Aboveground Wood Biomass of a Riparian Forest of the Lower Miranda River, Southern Pantanal, Brazil

et al. 2008

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“…The origin of these lakes has been attributed to aeolian processes because many relict aeolian landforms are preserved in the landscape (Assine and Soares, 2004), or to alternation of wet and arid phases during the Pleistocene. In fact, the genesis of these lakes was not satisfactorily explained.…”

Section: Discussionmentioning

confidence: 99%

“…Soares et al (2003) and Assine and Soares (2004) emphasized that the sand size is very selective but both size and aeolian features could have been inherited from the source area. Moreover, no depositional features of these paleodunes have ever been identified in the soils (Colinvaux et al 2000).…”

mentioning

confidence: 99%

Soil morphological control on saline and freshwater lake hydrogeochemistry in the Pantanal of Nhecolândia, Brazil

et al. 2008

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Abstract:Joint pedological, geochemical, hydrological and geophysical investigations were performed to study the coexistence of saline and freshwater lakes in close proximity and similar climatic conditions in the Nhecolândia region, Pantanal wetlands in Brazil. The saline lakes are concentrically surrounded by green sandy loam horizons, which cause differential hydrological regimes.Mg-calcite, K-silicates, and amorphous silica precipitate in the soil cover, whereas Mgsilicates and more soluble Na-carbonates are concentrated in the topsoil along the shore of the saline lake. In saline solutions, some minor elements (As, Se) reach values above the water quality recommendations, whereas others are controlled and incorporated in solid phases (Ba, Sr). Locally, the destruction of the sandy loam horizons generates very acidic soil solution 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

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“…Many paleochannel planform observed through satellite imagery on the surface of inactive parts of the modern systems were originated from river-system deposition with styles that markedly contrast with the modern channel systems (Assine & Soares 2004, providing a clear perspective to understand the climatic and tectonic impacts on fluvial dynamics.…”

Section: Physical Settingsmentioning

confidence: 99%

“…The Pantanal is an active sedimentary basin characterized by basin-margin faults and multiple subsurface faulted blocks, encompassing a series of depressions in which a more than 500 m-thick sedimentary succession has accumulated (Assine 2003, Assine & Soares 2004Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

The Quaternary alluvial systems tract of the Pantanal Basin, Brazil

et al. 2015

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ABSTRACT:The Pantanal Basin is an active sedimentary basin in central-west Brazil that consists of a complex alluvial systems tract characterized by the interaction between different river systems developed in one of the largest wetlands in the world. The Paraguay River is the trunk river system that drains the water and part of the sediment load received from areas outside of the basin. Depositional styles vary considerably along the river profiles throughout the basin, with the development of entrenched meandering belts, anastomosing reaches, and floodplain ponds. Paleodrainage patterns are preserved on the surface of abandoned lobes of fluvial fans, which also exhibit many degradational channels. Here, we propose a novel classification scheme according to which the geomorphology, hydrological regime and sedimentary dynamics of these fluvial systems are determined by the geology and geomorphology of the source areas. In this way, the following systems are recognized and described: (I) the Paraguay trunk-river plains; (II) fluvial fans sourced by the tablelands catchment area; (III) fluvial fans sourced by lowlands; and (IV) fluvial interfans. We highlight the importance of considering the influences of source areas when interpreting contrasting styles of fluvial architectures in the rock record. KEYWORDS: INVITED REVIEW RESUMO: A Bacia do Pantanal é uma bacia sedimentar situada no Centro-Oeste do Brasil, caracterizada pela presença de um moderno trato deposicional aluvial e pela interação de vários tipos de sistemas desenvolvidos em uma das maiores e mais importantes áreas úmidas do planeta. O Rio Paraguai representa o rio-tronco do sistema e drena a água e parte da carga sedimentar recebida de outras áreas extrabacinais. Os rios nos diferentes sistemas apresentam mudanças de estilo fluvial em consequência de fatores alogênicos e autogênicos, com desenvolvimento de cinturões de meandros incisos, domínios distributários não confinados e mundanças de canal único para padrões multicanal (anabranching). A superfície de lobos abandonados apresenta complexa

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Quaternary of the Pantanal, west-central Brazil

Cited by 190 publications

References 11 publications

Tree Species Composition, Structure, and Aboveground Wood Biomass of a Riparian Forest of the Lower Miranda River, Southern Pantanal, Brazil

Tree Species Composition, Structure, and Aboveground Wood Biomass of a Riparian Forest of the Lower Miranda River, Southern Pantanal, Brazil

Soil morphological control on saline and freshwater lake hydrogeochemistry in the Pantanal of Nhecolândia, Brazil

The Quaternary alluvial systems tract of the Pantanal Basin, Brazil

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