Genesis of sandstone-derived soils in the Cerrado of the Piauí State, Brazil

Souza, Diego Ferreira de; Barbosa, Ronny Sobreira; Silva, Yuri Jacques Agra Bezerra da; Moura, Márcio Cleto Soares de; Oliveira, Romário Porto de; Martins, Vanessa

doi:10.4136/ambi-agua.2355

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…Soils under different uses differ in their physical attributes in relation to native vegetation, and these differences are more evident in the topsoil [20]. Among the two forest coverings, the area of Eucalyptus presented higher values for DS and TP however; the numbers did not present significant difference.…”

Section: Resultsmentioning

confidence: 88%

Physical Attributes of Soil in Different Forest Cover in South of Tocantins

Marinho

Oliveira

Dias

et al. 2019

IJPSS

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Eucalyptus planting represents 72.7% of the total area of planted trees in Brazil, and is constantly growing in the Cerrado biome. Thus, the present study aimed to evaluate the physical qualities of soil under Eucalyptus sp. and a fragment of cerrado sensu stricto. The study was conducted at the experimental farm of the Federal University of Tocantins, campus Gurupi, TO, on the coordinates 11º 46’ 25’’ latitude S and 49º 02’ 54’’ longitude W, in soil classified as Plinthosol petric. The collections were performed in the layer with a depth of 0–20 cm, with eleven repetitions for each area. The attributes evaluated were: soil texture, density (DS), particle density (PD) and total porosity (TP). The soil granulometric composition in the two studied areas was predominant of the sandy fraction. The values of DS, PD and TP did not show significant differences by Tukey test (5%), which assumes that the change of cover from cerrado sensu stricto to forest planted with Eucalyptus sp. does not favor physical problems for the soil under study.

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Section: Resultsmentioning

confidence: 88%

Physical Attributes of Soil in Different Forest Cover in South of Tocantins

Marinho

Oliveira

Dias

et al. 2019

IJPSS

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“…The SOC contents were medium to low, varying from 0.01 to 1.8 % (mean value of 0.9 %). The low cation exchange capacity is typical in the soils studied (Souza et al, 2019).…”

Section: Natural Content Of Rees In Soilsmentioning

confidence: 84%

Quality reference values for rare earth elements in soils from one of the last agricultural frontiers in Brazil

Silva

Oliveira

Silva

et al. 2021

Sci. agric. (Piracicaba, Braz.)

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Environmental impacts caused by the addition of rare earth elements (REEs) to agricultural soils are a growing concern. The sedimentary basin of the Gurguéia River is located in one of the last agricultural frontiers in Brazil; nevertheless, data regarding quality reference values (QRVs) for REEs in soils are still scarce. The objective of this study was therefore to determine the natural concentration and establish the QRVs of REEs in soils of Gurguéia watershed, Brazil. Fifty-five composite soil samples were collected at sites under no or minimal anthropic interference. The average REE natural concentrations in soils from the Gurguéia watershed were lower than those found in other regions of Brazil and worldwide, following the order (mg kg -1 ): Ce (14.01) > Nd (6.19) > La (5.52) > Pr (2.51) > Sm (1.45) > Gd (0.93) > Dy (0.63) > Er (0.42) > Yb (0.39) > Tb (0.28) > Eu (0.26) > Lu (0.20). The parent material was the main factor that controlled the distribution of REEs in soils. The QRVs in soils followed the order (mg kg -1 ): Ce (18.8) > Nd (7.92) > La (6.32) > Pr (3.3) > Sm (1.97) > Gd (1.35) > Dy (0.85) > Er (0.55) > Yb (0.47) > Tb (0.37) > Lu (0.25). These values serve as a basis to assist the development of legislation, including REE thresholds for Brazilian soils.

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“…In soils over SS, the relationship was weak and positive. Soils over SS are high in the sand (Souza et al 2019;Ofem et al 2020b) and most likely to be well drained and more porous with a good supply of oxygen, and thus will most likely facilitate oxidation of organic matter (Bohn et al 2001). This results in a high decomposition rate and low SOM accumulation.…”

Section: Soil Organic Matter and Porositymentioning

confidence: 99%

Estimating Soil Organic Matter: A Case Study of Soil Physical Properties for Environment-Related Issues in Southeast Nigeria

et al. 2021

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The different deposition periods in sedimentary geological environment have made the build-up and estimation of soil organic matter ambiguous to study. Soil organic matter has received global attention in the ambience of international policy regarding environmental health and safety. This research was to understand the inter-relationship between soil organic matter and bulk density, saturated hydraulic conductivity (Ksat), total, air-filled and capillary porosities for organic matter estimation, via different multiple linear regression functions (i.e., leap backward, leap forward, leapseq and lmStepAIC), in soils developed over the sedimentary geological environment. Eight mapping units were obtained in Ishibori, Agoi Ibami and Mfamosing via digital elevation model. Two pits were sited within each mapping unit, and 53 soil samples were used for the study. In soils over shale-limestone-sandstone, two pits were sited, six in alluvium, four in sandstone-limestone and four in limestone. Overall correlation between SOM with Ksat (r = 0.626) and BD (r = − 0.588) was significant (p < 0.001). The strongest correlation was obtained for SOM with BD (r = − 0.783) and Ksat (r = 0.790) in soils over limestone. In contrast, soils over shale-limestone and sandstone geological environment gave the weakest relationship (r < 0.6). Linear regression gave a similar prediction output. The best performing was leapbackward (RMSE = 11.50%, R 2 = 0.58, MAE = 8.48 %), which produced a smaller error when compared with leap forward, leapseq and lmStepAIC functions in organic matter estimation. Therefore, we recommend applying leapback linear regression when estimating soil organic variation with physical soil properties for solving soil-environmental issues towards sustainable crop production in southeast Nigeria.

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Genesis of sandstone-derived soils in the Cerrado of the Piauí State, Brazil

Cited by 3 publications

References 9 publications

Physical Attributes of Soil in Different Forest Cover in South of Tocantins

Physical Attributes of Soil in Different Forest Cover in South of Tocantins

Quality reference values for rare earth elements in soils from one of the last agricultural frontiers in Brazil

Estimating Soil Organic Matter: A Case Study of Soil Physical Properties for Environment-Related Issues in Southeast Nigeria

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