@Article{RossettiGriTuoCorTat:2018:InLaQu,
author = "Rossetti, Dilce de F{\'a}tima and Gribel, Rog{\'e}rio and
Tuomisto, Hanna and Cordeiro, Carlos L. O. and Tatumi, Sonia H.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas da Amaz{\^o}nia (INPA)} and {University of
Turku} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Universidade Federal de S{\~a}o Paulo (UNIFESP)}",
title = "The influence of late Quaternary sedimentation on vegetation in an
Amazonian lowland megafan",
journal = "Earth Surface Processes and Landforms",
year = "2018",
volume = "43",
number = "6",
pages = "1259--1279",
month = "May",
keywords = "megafan, sedimentation, late Quaternary, northern Amazonian
lowlands, plant distribution, physiognomy.",
abstract = "The largest areas of white-sand vegetation in northern Amazonia
are confined to Late Pleistocene-Holocene megafan depositional
systems, which suggest a relationship between the two. The aim of
this work is to determine: (i) the relative role of sedimentary
history and recent ecological processes to explaining the mosaic
of white-sand forest patches, grasslands and shrublands in a
wetland area of northern Amazonia; and (ii) the long-term
successional trajectory that led to the establishment of the
white-sand forest patches. Facies analysis was used to reconstruct
the megafan paleoenvironment; C-13, total organic carbon and
carbon/nitrogen from sedimentary organic matter to reconstruct the
past vegetation; and floristic inventories to characterize the
modern vegetation. The results revealed that the Virua megafan
consists of various sandy sub-environments, including aeolian sand
dunes and sheets developed mostly in the Holocene after the
megafan turned inactive as a depositional site. Dune margins and
tops are colonized by white-sand trees mixed with a few generalist
rain-forest species, whereas adjacent lower-lying areas, which are
affected by seasonal flooding, are covered by graminoid plants
and/or shrubs. The latter initiated their development over the
megafan surface in different times of the Holocene due to
hydrological gradients imposed by the topography of the various
megafan depositional environments, while the white-sand forest
became dominant only on sand dunes over the last few centuries. We
suggest that the late Quaternary sedimentary history was crucial
in creating morphologies that now determine topographic gradients
responsible for different vegetation physiognomies over the
Amazonian lowlands.",
doi = "10.1002/esp.4312",
url = "http://dx.doi.org/10.1002/esp.4312",
issn = "0197-9337",
language = "en",
targetfile = "rossetti_influence.pdf",
urlaccessdate = "27 abr. 2024"
}