Respiração edáfica e nutrientes na Amazônia (Região de Manaus): floresta arenícola, campinarana e campina ()

Martins, Fernando Roberto; Matthes, Luiz Antonio Ferraz

doi:10.1590/1809-43921978082233

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…Rossetti et al (2014) suggest that megafan development and accompanying sedimentary dynamics are of great importance regarding vegetational developments in northern Amazonia. Inside late Quaternary megafans, almost half of the surface might have consisted of grass campinarana, a vegetation type that occurs in wetlands characterized mainly by Poaceae, and that is related to slow vegetational succession processes (Martins andMattes 1978, Cordeiro andRossetti 2015). Outside of the megafan, grasses and shrub landscapes can easily make up 13% of vegetation.…”

Section: Biogeographical Contextmentioning

confidence: 99%

The onset of grasses in the Amazon drainage basin, evidence from the fossil record

Kirschner¹,

Hoorn²

2020

Frontiers of Biogeography

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Highlights • Grasses have been a common component of the Amazon drainage basin (ADB) since at least the Neogene (23 Ma). • A large wetland, that accommodated extensive amounts of grass remains, existed in western Amazonia from around 23 to 9 Ma. • From c. 9 Ma, grasses were likely the successful pioneers of new habitats that formed on the Andean slopes, megafans, and the floodplains of the Amazon River. • The rising Andes, together with environmental and climate change, favoured grass development in the ADB during the Neogene and Quaternary. • In the last 5 million years, open surfaces in the high Andes offered comprehensive habitats for grass colonisation.

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Section: Biogeographical Contextmentioning

confidence: 99%

The onset of grasses in the Amazon drainage basin, evidence from the fossil record

Kirschner¹,

Hoorn²

2020

Frontiers of Biogeography

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“…Campinaranas are related to a slow process of vegetation succession (Martins and Mattes 1978). They occur in sandy soils that are chemically poor in nutrients (Schaefer, Mendonça, and Filho 2009).…”

Section: Study Areamentioning

confidence: 99%

“…between 2003 and 2010, was not a problem in the analysis, because of the lack of human activity over the megafan, which is due to the difficult access and occurrence within a protected area corresponding to the VNP. Moreover, campinaranas are characterized by a long growing process (Martins and Mattes 1978), and likely did not change much over time. Deforestation, when present, was documented at low rates (i.e.…”

Section: Remote-sensing Imagerymentioning

confidence: 99%

Mapping vegetation in a late Quaternary landform of the Amazonian wetlands using object-based image analysis and decision tree classification

Cordeiro

Rossetti

2015

International Journal of Remote Sensing

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Fan-shaped morphologies related to late Quaternary residual megafan depositional systems are common features over wide areas in northern Amazonia. These features were formed by ancient distributary drainage systems that are in great contrast to tributary drainage networks that typify the modern Amazon basin. The surfaces of the Amazonian megafans constitute vegetacional mosaic wetlands with different campinarana types. A fine-scale-resolution investigation is required to provide detailed classification maps for the various campinarana and surrounding forest types associated with the Amazonian megafans. This approach remains to be presented, despite its relevance for analysing the relationship between stages of plant succession and sedimentary dynamics associated with the evolution of megafans. In this work, we develop a methodology for classifying vegetation over a fan-shaped megafan palaeoform from a northern Amazonian wetland. The approach included object-based image analysis (OBIA) and data-mining (DM) techniques combining Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) images, land-cover fractions derived by the linear spectral mixing model, synthetic aperture radar (SAR) images, and the digital elevation model (DEM) acquired during the Shuttle Radar Topography Mission (SRTM). The DEM, vegetation fraction, and ASTER band 3 were the most useful parameters for defining the forest classes. The normalized difference vegetation index (NDVI), ASTER band 1, vegetation fraction, and the Advanced Land Observing Satellite (ALOS)/Phased Array type L-band Synthetic Aperture Radar (PALSAR) transmitting and receiving horizontal polarization (HH) and transmitting horizontal and receiving vertical polarization (HV) were all effective in distinguishing the wetland classes campinarana and Mauritia. Tests of statistical significance indicated the overall accuracies and kappa coefficients (κ) of 88% and 0.86 for the final map, respectively. The allocation disagreement coefficient of 5% and a quantity disagreement value of 7% further attested the statistical significance of the classification results. Hence, in addition to water, exposed soil, and deforestation areas, OBIA and DM were successful for differentiating a large number of open (forest, wood, shrub, and grass campinaranas), forest (terra firme, várzea, igapó, and alluvial), as well as Mauritia wetland classes in the inner and outer areas of the studied megafan.

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Interaction of abiotic factor on soil CO2 efflux in three forest communities in tropical deciduous forest from India

Mishra

Chaudhary

Jain

et al. 2019

Environ Monit Assess

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Respiração edáfica e nutrientes na Amazônia (Região de Manaus): floresta arenícola, campinarana e campina ()

Cited by 4 publications

References 4 publications

The onset of grasses in the Amazon drainage basin, evidence from the fossil record

The onset of grasses in the Amazon drainage basin, evidence from the fossil record

Mapping vegetation in a late Quaternary landform of the Amazonian wetlands using object-based image analysis and decision tree classification

Interaction of abiotic factor on soil CO2 efflux in three forest communities in tropical deciduous forest from India

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