Pedotransfer functions for estimating soil bulk density from existing soil survey reports in Brazil

Benites, V. M.; Machado, P. L. O. A.; Fidalgo, E. C. C.; Coelho, Maurício Rizzato; Madari, B. E.

doi:10.1016/j.geoderma.2007.01.005

Cited by 160 publications

(193 citation statements)

References 22 publications

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“…When found in natural conditions, Table 3. Bulk density (Db), gravimetric water content (W) and hydraulic conductivity obtained from PTFs developed by Benites et al (2007) and Tomasella et al (2003), based on Rosetta software, and on Embrapa's data. High correlations were also observed in aquifers belonging to P2 system.…”

Section: K-values Obtained By the Rosetta Methodsmentioning

confidence: 99%

“…In order to estimate the hydraulic conductivity more appropriately and to adapt the PTFs for soils of the Federal District, values of soil density (Dd) and gravimetric water contents (W)were obtained. PTFs developed by Benites et al (2007), shown in equation (4) and Tomasella et al (2003), shown in equation (5) The PTF used to estimate the water retention parameters from van Genuchten's equations in the range between -33 kPa (W33) and -1500 kPa (W1500) is as follow (Tomasella et al 2003 (5) where CS = coarse sand (%); FS = fine sand (%); SI = silt (%); CL = clay (%); Db = bulk density (g.cm -3 ); Me = moisture equivalent (%); W 10kPa , W 33kPa , W 1500kPa gravimetric water content at 10, 33, and 1500 kPa, respectively (g.g -1 ); X 14 -X 17 and Z 9 -Z 11 and Z 13 , auxiliary variables.…”

Section: Pedotransfer Functions (Rosetta Software)mentioning

confidence: 99%

“…Specific PTFs for tropical soils were proposed by Van den Berg et al (1997), Tomasella et al (2000Tomasella et al ( , 2003, Hodnett and Tomasella (2002), Oliveira et al (2002) and Benites et al (2007). They developed PTFs based on multiple linear regression equations and artificial neural networks to determine the parameters specified in the Brooks-Corey (1964) andvan Genuchten (1980) equations, or to estimate parameters related to water retention and hydraulic conductivity.…”

Section: Introductionmentioning

confidence: 99%

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Hydraulic characterization from porous aquifers of the Brazilian Federal District

2015

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Hydraulic conductivity (K) in unsaturated soil is a key input parameter for modeling subsurface water and solute movements. K-values are also important to better define the potential of aquifers and to optimize water resources management activities. Since K-values are usually not readily available, different techniques are applied to estimate them. This study aimed to estimate unsaturated K-values from porous aquifers found in the Federal District of Brazil. Infiltration tests were conducted in different soil types using the open-end-hole approach and the permeability test using shallow boreholes with specific depths, as reported by Heitfeld in 1979. Soil structure was taken into consideration in such estimations. In order to consider important soil properties such as soil texture and bulk density, K-values were also estimated by means of pedotransfer functions (PTFs). Soil texture was determined in the laboratory and used as input parameter for PTFs. Results from open-end-hole method and permeability test compared to those obtained from pedotransfer functions. K-values from four different shallow porous aquifers systems encountered in the Federal District varied from 10 -8 ms -1 to 10 -6 ms -1 . Highest K-values were found in Oxisols while the lowest rates were found in Inceptisols. Decreasing conductivity trend was found with increasing depth due to the increase of loamy soils. Variations in the rate of hydraulic conductivity indicated heterogeneity of porous aquifers due to differences in textural and structural characteristics of the soils.KEYWORDS: unsaturated hydraulic conductivity; open-end-hole; pedotransfer functions. RESUMO: A condutividade hidráulica (K) em meios não saturados é um parâmetro essencial para modelar fluxos de água e solutos no subsolo. Os valores de K são também importantes para estimar o potencial dos aquíferos e otimizar a gestão de recursos hídricos. Tais valores geralmente não estão disponíveis e diferentes técnicas são aplicadas para obtê-los. O objetivo deste estudo foi estimar valores de K em meios porosos não saturados na região do Distrito Federal (DF). Foram realizados testes de infiltração em diferentes tipos de solo, utilizando o método open-end-hole, e ensaios de permeabilidade, em poços rasos com profundidades específicas, como descritos por Heitfeld (1979). Em tais estimativas a estrutura dos solos foi considerada. Valores de K também foram estimados por meio de funções de pedotransferência (PTFs

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Section: K-values Obtained By the Rosetta Methodsmentioning

confidence: 99%

Section: Pedotransfer Functions (Rosetta Software)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydraulic characterization from porous aquifers of the Brazilian Federal District

2015

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“…Texture was highly variable (41 AE 15% >0.02 mm sand fraction), ranging from sandy clay to heavy clay. Bulk density was only weakly positively correlated with sand content (r = 0.14); clay content is a better predictor of bulk density (see for example, Heuscher et al 2005;Benites et al 2007) but was not determined for these samples.…”

Section: Subsoil Variability At Paddock Scalementioning

confidence: 95%

High clay contents, dense soils, and spatial variability are the principal subsoil constraints to cropping the higher rainfall land in south-eastern Australia

MacEwan¹,

Crawford²,

Newton

et al. 2010

Soil Res.

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Abstract. Available soil information and unpublished data from soil survey indicate that high clay contents and high bulk density are the major subsoil constraints to crop growth in the high rainfall zone (HRZ) of south-eastern Australia. Seven high rainfall agroecological zones are proposed as sub-divisions of the region to focus future research and development. The HRZ is dominated by texture-contrast soils (69.9%) and soils with clay subsoil (89.4%) and high bulk density (mean 1.6 t/m 3 ). Sodicity and acidity are also significant constraints to crop production in the HRZ. The physical limitations to root growth in the HRZ subsoils are best appreciated through the least-limiting water range concept and growth-limiting bulk densities. Management options and results of past research and intervention in soil loosening, drainage, raised beds, liming, and gypsum are reviewed. Climatic uncertainty raises questions about the future relevance of waterlogging as a constraint in the HRZ and confounds the development of reliable recommendations for engineering intervention.

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“…Samples could be sampled from the following soil layers: 0-0.1, 0.1-0.2, 0.2-0.3, 0.4-0.5, 0.7-0.8 and 0.9-1.0 m for three out of nine pits and 0-0.1, 0.1-0.2, 0.2-0.3 m in the other 6 pits ( Figure 2). Regression models or pedotransfer functions (Benites et al, 2007) can be used to estimate bulk density for the layers that were not sampled (i.e., 0.3-0.4, 0.5-0.6, 0.6-0.7, 0.8-0.9 m). In the three deeper soil pits (till 1.0 m) soil bulk density should be determined and soil C content should be analyzed from all the 36 samples per site.…”

Section: Sampling Depthmentioning

confidence: 99%

Quantifying soil carbon stocks and greenhouse gas fluxes in the sugarcane agrosystem: point of view

Cerri

Galdos

Carvalho

et al. 2013

Sci. agric. (Piracicaba, Braz.)

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Strategies to mitigate climate change through the use of biofuels (such as ethanol) are associated not only to the increase in the amount of C stored in soils but also to the reduction of GHG emissions to the atmosphere.This report mainly aimed to propose appropriate methodologies for the determinations of soil organic carbon stocks and greenhouse gas fluxes in agricultural phase of the sugarcane production. Therefore, the text is a piece of contribution that may help to obtain data not only on soil carbon stocks but also on greenhouse gas emissions in order to provide an accurate life cycle assessment for the ethanol. Given that the greenhouse gas value is the primary measure of biofuel product quality, biorefiners that can show a higher offset of their product will have an advantage in the market place.

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Pedotransfer functions for estimating soil bulk density from existing soil survey reports in Brazil

Cited by 160 publications

References 22 publications

Hydraulic characterization from porous aquifers of the Brazilian Federal District

Hydraulic characterization from porous aquifers of the Brazilian Federal District

High clay contents, dense soils, and spatial variability are the principal subsoil constraints to cropping the higher rainfall land in south-eastern Australia

Quantifying soil carbon stocks and greenhouse gas fluxes in the sugarcane agrosystem: point of view

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