Basalt and rhyo-dacite weathering and soil clay formation under subtropical climate in southern Brazil

Caner, Laurent; Radtke, Leopoldo Moura; Vignol-Lelarge, Maria Lídia; Inda, Alberto Vasconcellos; Bortoluzzi, Édson Campanhola; Mexias, André Sampaio

doi:10.1016/j.geoderma.2014.06.024

Cited by 70 publications

(37 citation statements)

References 42 publications

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“…The original basalt mineralogy, rich in ferromagnesian minerals (CAMPOS et al, 2012), raised particle density values (Table 2); however, soil density was lower than 1.4 g cm -3 (Table 2). It can be associated with some factor such as sandfraction low content, clay-content prevalence (Table 2), secondary mineralogy, and high the microporosity of these soils (CANER et al, 2014). The soil density values found here are lower than are those reported by Oliveira, Ferreira and Marques (2004) for soils in this region.…”

Section: Resultscontrasting

confidence: 56%

“…Even though favorable conditions also occur in Nitisols from Paraná River basin (CANER et al, 2014); the peculiar climate of the southern coast of Pernambuco should make them more prominent, enhancing an acrid character in the volcano-sedimentary basin of Cabo. The positive ΔpH in these soils could be attributed to gibbsite and crystalline iron oxides (DONAGEMMA et al, 2008).…”

Section: Resultsmentioning

confidence: 99%

“…Unlike sand and silt, clay-fraction homogeneity among the three sections ( Figure 3A and B) is connected to the low propensity of kaolinite-oxide clays to lateral flows over the slope (COOPER;VIDAL-TORRADO, 2005).…”

Section: Resultsmentioning

confidence: 99%

“…In Brazil, Nitisols are associated with basaltic rocks from Paraná basin (CANER et al, 2014). Altered basaltic rocks, which are rich in ferromagnesian minerals, generally give rise to Red Nitisols with a negative net charge and absence of acric character (COOPER; VIDAL- TORRADO, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Associations Between Attributes of Nitisols and the Climate of the Southern Coast of Pernambuco

et al. 2018

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-Nitisols are livelihood sources of agricultural and socio-economic development in several underdeveloped countries worldwide, including Brazil. Brazilian Nitisols are usually associated with basaltic rocks found in the Southern and Southeastern regions of the country. However, Nitisols derived from basalt also occur on the southern coast of Pernambuco state, a region under full urban, agricultural, and industrial development. Aiming to understand the relationship between climate and attributes of Nitisols from the southern coast of Pernambuco, we performed morphological descriptions, physical and chemical analyzes, iron selective extraction, and soil mineralogy (sand, silt, and clay) for three basaltic soil profiles along a land slope. The results suggest a strong weathering of the profiles due to climate conditions, besides a great loss of basic cations and xanthization process, resulting in the natural genesis of acric Nitisols with yellowish coloration, which has not been yet cataloged for this soil order in the Brazilian taxonomic system. In addition, there is a variation for physical attributes of Nitisols along the slope.Keywords: Tropical soils. Soil-environment relationship. Xanthization process. ASSOCIAÇÕES ENTRE OS ATRIBUTOS DE NITOSSOLOS E O CLIMA DA COSTA SUL DE PERNAMBUCORESUMO -Os Nitossolos dão suporte ao desenvolvimento agrícola e socioeconômico de muitos países subdesenvolvidos do mundo, incluindo o Brasil. Os Nitossolos brasileiros estão geralmente associados às rochas basálticas das regiões Sul e Sudeste. Entretanto, Nitossolos derivado de basalto também ocorrem na costa sul de Pernambuco, uma região em pleno desenvolvimento urbano, agrícola e industrial. Objetivando compreender as relações entre o clima e os atributos dos Nitossolos da costa sul de Pernambuco, foram realizadas descrições morfológicas, análises físicas e químicas, extrações seletivas de ferro e a determinação da mineralogia das frações areia, silte e argila de três perfis derivados de basalto ao longo de uma vertente. Os resultados demonstram que o clima da região implica em forte intemperização dos perfis, em grande perda de bases e favorece o processo de xantização, resultando na singular gênese de Nitossolos com matizes amarelados e caráter ácrico, fato que até o momento ainda não foi catalogado para esta ordem no sistema taxonômico brasileiro. Os resultados também demonstram a variação dos atributos físicos dos Nitossolos ao longo da vertente.Palavras-chave: Solos tropicais. Relação solo-ambiente. Processo de xantização.

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Section: Resultscontrasting

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Associations Between Attributes of Nitisols and the Climate of the Southern Coast of Pernambuco

et al. 2018

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“…Significant differences between Eucalyptus afforestation (E) and prairie control (P) plots are shown *p The disintegration of these clay minerals provides a source of silica (SiO 2 ) (Sommer et al 2006). When silica leaching is not complete, kaolinite (1:1) can become an important mineral in the soil (Sposito 2008;Caner et al 2014). In this process, there is also loss of Al and, to a lesser extent, of Fe.…”

Section: Afforestation and Soil Acidificationmentioning

confidence: 99%

Soil Organic Carbon vs. Bulk Density Following Temperate Grassland Afforestation

et al. 2016

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Afforestation is part of a worldwide strategy to mitigate CO 2 emissions. However, afforestation in grassland soils may have the opposite effect by promoting the loss of native carbon. Potential effects of this land use change on the flow of organic carbon to and from the soil can be described through bulk density (Db). Nowadays the suitability of Db for this purpose is being questioned. In order to bring new elements to the discussion, we carried out a comparative study of soil in the western region of Uruguay. Based on the background information and our own data, collected for over a decade, we evaluated the fitness of Db as proxy soil organic carbon (SOC) stocks in grassland converted to tree afforestation. These data were also related to soil pH values. The sampling consisted of five plots afforested with Eucalyptus grandis paired with control plots under grassland. All samples were taken at depth (0-10 cm and 10-20 cm) except for Db samples (0-10 cm). In afforested sites, Db increased (1.62 vs 1.53 g/cm 3 ; p ≤ 0.01) and SOC decreased (0-10 cm: 0.90 vs. 1.22%; p ≤ 0.08). Db values were not significantly correlated with SOC content. As with SOC, pH values decreased after afforestation at both depths (0-10 cm: 4.92 vs. 5.62; p ≤ 0.01; 10-20 cm: 4.76 vs. 5.54; p ≤ 0.01). The high acidity generated in soils following afforestation, is enough to affect the interaction between mineral and organic fractions and, with them, the original Db values. According to a previous study in the same location, there is a change in the predominance of different clay minerals in the topsoil (0-20 cm). This qualitative change in the mineral fraction Environ. Process. can affect the ability of the soil to retain organic carbon, and not be reflected in the recorded Db values. The non-reciprocity recorded between Db and SOC values warns about the need for restriction of the generic use of Db in calculation of SOC stocks estimation. In view of these results, we present a discussion of possible causes that explain the disparity between Db values and SOC measurements.

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Impacts of forest conversion and agriculture practices on water pathways in Southern Brazil

Robinet

Minella

Barros

et al. 2018

Hydrological Processes

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Land-use/cover change (LUCC), and more specifically deforestation and multidecadal agriculture, is one of the various controlling factors of water fluxes at the hillslope or catchment scale. We investigated the impact of LUCC on water pathways and stream stormflow generation processes in a subtropical region in southern Brazil. We monitored, sampled and analysed stream water, pore water, subsurface water, and rainwater for dissolved silicon concentration (DSi) and 18 O/ 16 O (δ 18 O) signature to identify contributing sources to the streamflow under forest and under agriculture. Both forested and agricultural catchments were highly responsive to rainfall events in terms of discharge and shallow groundwater level. DSi versus δ 18 O scatter plots indicated that for both land-use types, two run-off components contributed to the stream discharge. The presence of a dense macropore network, combined with the presence of a compact and impeding B-horizon, led to rapid subsurface flow in the forested catchment. In the agricultural catchment, the rapid response to rainfall was mostly due to surface run-off. A 2-component isotopic hydrograph separation indicated a larger contribution of rainfall water to run-off during rainfall event in the agricultural catchments. We attributed this higher contribution to a decrease in topsoil hydraulic conductivity associated with agricultural practices. The chemical signature of the old water component in the forested catchment was very similar to that of the shallow groundwater and the pore soil water: It is therefore likely that the shallow groundwater was the main source of old water. This is not the case in the agricultural catchments where the old water component had a much higher DSi concentration than the shallow groundwater and the soil pore water. As the agricultural catchments were larger, this may to some extent simply be a scale effect. However, the higher water yields under agriculture and the high DSi concentration observed in the old water under agriculture suggest a significant contribution of deep groundwater to catchment run-off under agriculture, suggesting that LUCC may have significant effects on weathering rates and patterns.

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Basalt and rhyo-dacite weathering and soil clay formation under subtropical climate in southern Brazil

Cited by 70 publications

References 42 publications

Associations Between Attributes of Nitisols and the Climate of the Southern Coast of Pernambuco

Associations Between Attributes of Nitisols and the Climate of the Southern Coast of Pernambuco

Soil Organic Carbon vs. Bulk Density Following Temperate Grassland Afforestation

Impacts of forest conversion and agriculture practices on water pathways in Southern Brazil

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