Pedogenesis in a karst environment in the Cerrado biome, northern Brazil

Maranhão, Deyvid Diego Carvalho; Pereira, Marcos Gervásio; Collier, Leonardo Santos; Anjos, Lúcia Helena Cunha dos; Azevedo, Antônio Carlos de; Cavassani, Rafael de Souza

doi:10.1016/j.geoderma.2019.114169

Cited by 16 publications

(15 citation statements)

References 64 publications

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“…As a result of this analysis, we classify every date of each year on one of four different seasonal periods: RS, EDS, MDS, or LDS. These indigenous territories have been demarked and regularized since the early 1980s [30,31], and are formed majorly by sandy soils covered with Cerrado vegetation and gallery forests following the streams [32,33]. The Corda River crosses the Porquinhos IL, which shelters more significant forest resources than Kanela IL.…”

Section: Study Areamentioning

confidence: 99%

Assessing Wildfire Regimes in Indigenous Lands of the Brazilian Savannah-Like Cerrado

Melo¹,

Sparacino²,

Argibay³

et al. 2021

Fire

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The Brazilian savannah-like Cerrado is classified as a fire-dependent biome. Human activities have altered the fire regimes in the region, and as a result, not all fires have ecological benefits. The indigenous lands (ILs) of the Brazilian Cerrado have registered the recurrence of forest fires. Thus, the diagnosis of these events is fundamental to understanding the burning regimes and their consequences. The main objective of this paper is to evaluate the fire regimes in Cerrado’s indigenous lands from 2008 to 2017. We used the Landsat time series, at 30 m spatial resolution, available in the Google Earth Engine platform to delineate the burned areas. We used precipitation data from a meteorological station to define the rainy season (RS), early dry season (EDS), middle dry season (MDS), and late dry season (LDS) periods. During 2008–2017, our results show that the total burned area in the indigenous lands and surrounding area was 2,289,562 hectares, distributed in 14,653 scars. Most fires took place between June and November, and the annual burned area was quite different in the years studied. It was also possible to identify areas with high fire recurrence. The fire regime patterns described here are the first step towards understanding the fire regimes in the region and establishing directions to improve management strategies and guide public policies.

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Section: Study Areamentioning

confidence: 99%

Assessing Wildfire Regimes in Indigenous Lands of the Brazilian Savannah-Like Cerrado

Melo¹,

Sparacino²,

Argibay³

et al. 2021

Fire

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“…In the Brazilian states of Minas Gerais, São Paulo, Mato Grosso do Sul, Bahia, Ceará, Goiás and Tocantins host karst environments [31]. The study area ( Figure 1) is located at the junction of the municipality of Mambai.…”

Section: Study Areamentioning

confidence: 99%

Detection of Cover Collapse Doline and Other Epikarst Features by Multiple Geophysical Techniques, Case Study of Tarimba Cave, Brazil

Hussain

Uagoda

Borges

et al. 2020

Water

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Reliable characterization of the karst system is essential for risk assessment where many associated hazards (e.g., cover-collapse dolines and groundwater pollution) can affect natural and built environments, threatening public safety. The use of multiple geophysical approaches may offer an improved way to investigate such cover-collapse sinkholes and aid in geohazard risk assessments. In this paper, covered karst, which has two types of shallow caves (vadose and fluvial) located in Tarimba (Goias, Brazil), was investigated using various geophysical methods to evaluate their efficiency in the delineation of the geometry of sediments filled sinkhole. The methods used for the investigation were Electrical Resistivity Tomography (ERT), Seismic Refraction Survey (SRS), Seismic Refraction Tomography (SRT) and the Very Low Frequency Electromagnetic (VLF-EM) method. The study developed several (2D) sections of the measured physical properties, including P-wave velocity and electrical resistivity, as well as the induced current (because of local bodies). For the analysis and processing of the data obtained from these methods, the following approaches were adopted: ERT inversion using a least-square scheme, Karous-Hjelt filter for VLF-EM data and time-distance curves and Vp cross-sections for the SRS. The refraction data analysis showed three-layered stratigraphy topsoil, claystone and carbonate bedrock, respectively. The findings obtained from ERT (three-layered stratigraphy and sediment-filled doline), as well as VLF-EM (fractured or filled caves as a positive anomaly), were found to be consistent with the actual field conditions. However, the SRS and SRT methods did not show the collapsed material and reached the limited the depth because of shorter profile lengths. The study provides a reasonable basis for the development of an integrated geophysical approach for site characterization of karst systems, particularly the perched tank and collapse doline.

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“…Weathering of primary minerals in summit or upland landscape positions releases cations and anions needed to form secondary minerals, which leads to a subtle loss of weatherable constituents and an increase in secondary minerals as a function of elevation (Yoo et al., 2009). For example, in a tropical karst toposequence with carbonate parent materials, soils in upland landscape positions exhibited lower CaCO 3 in coarse sands compared with lower landscape positions, which was attributed to CaCO 3 dissolution, transport, and reprecipitation across the toposequence (Maranhão et al., 2020). Clay fraction mineralogy assemblage may not vary as strongly between upland and lowland landscape positions, as was observed in toposequences forming in limestone or calcareous parent materials (Egli et al., 2008; Sedov et al., 2008; Maranhão et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

“…For example, in a tropical karst toposequence with carbonate parent materials, soils in upland landscape positions exhibited lower CaCO 3 in coarse sands compared with lower landscape positions, which was attributed to CaCO 3 dissolution, transport, and reprecipitation across the toposequence (Maranhão et al., 2020). Clay fraction mineralogy assemblage may not vary as strongly between upland and lowland landscape positions, as was observed in toposequences forming in limestone or calcareous parent materials (Egli et al., 2008; Sedov et al., 2008; Maranhão et al., 2020). However, the relative proportions and crystallinity of primary and secondary minerals may vary substantially across toposequences.…”

Section: Introductionmentioning

confidence: 99%

“…For example, dithionite extractable Fe (Fe d ) increased downslope in soils developed on limestone across an elevational gradient (Egli et al., 2008) and in a toposequence in Brazil (Moniz et al., 1982). In contrast, Fe d values were greatest in summit positions and decreased in downslope positions of a toposequence in a karst environment (Maranhão et al., 2020), a Mollisol catena (Khan and Fenton, 1996), and a terra rossa toposequence (Boero and Schwertmann, 1987). These latter studies attributed the trends to Fe loss from the profile.…”

Section: Introductionmentioning

confidence: 99%

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Topographic gradients of soil physical, chemical, and mineralogical properties in central Kentucky sinkholes

McGraw

Ramsey

Obura

et al. 2022

Soil Science Soc of Amer J

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An estimated 20% of the world's land surface is underlain by lithologies favorable for karst formation. Karst features (e.g., sinkholes) and soils coevolve, likely influencing local pedogenesis, soil carbon storage, and hydrologic patterns. While karst is widespread, our understanding of the influence of karst geomorphology on pedogenesis remains limited. To better estimate the impact of karst geomorphology on pedogenesis, we characterized nine pedons as a function of landscape position (i.e., toposequence) in two subsidence sinkholes located in the Inner Bluegrass physiographic region of central Kentucky; we characterized a suite of soil physical, chemical, and mineralogical properties. The Inner Bluegrass is underlain by a phosphatic limestone and is susceptible to karst formation. Expectedly, total carbon was greater in lowland positions relative to upland landscape positions. However, inverse relationships between elevation and clay content, selective iron, aluminum, and silicon extracts contradicted previous toposequence trends. Clay mineralogy differences between toeslope and summit positions suggested sediment transport from summit to toeslope positions. Karst geomorphology may limit pedogenesis and facilitate more rapid material export through karst conduits compared to other lithologies. Given the extent of karst terrains and lithologies susceptible to karst formation, future work is needed to understand the magnitude of the impact of karst on pedogenesis and other earth system processes. INTRODUCTIONKarst topography is complex; the rapid dissolution of carbonates leads to unique landscape features such as disappearing streams, abundant springs, extensive cave systems, lack of surface drainage, and sinkholes (Ford and Williams, 2007;Palmer, 2007). Karst hydrology is highly interconnected with rapid flowpaths that connect the soil surface to deeper groundwater (Chen et al.,

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Pedogenesis in a karst environment in the Cerrado biome, northern Brazil

Cited by 16 publications

References 64 publications

Assessing Wildfire Regimes in Indigenous Lands of the Brazilian Savannah-Like Cerrado

Assessing Wildfire Regimes in Indigenous Lands of the Brazilian Savannah-Like Cerrado

Detection of Cover Collapse Doline and Other Epikarst Features by Multiple Geophysical Techniques, Case Study of Tarimba Cave, Brazil

Topographic gradients of soil physical, chemical, and mineralogical properties in central Kentucky sinkholes

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