Funções de pedotransferência para predição da umidade retida a potenciais específicos em solos do estado de Pernambuco

Oliveira, Leandro Barbosa de; Ribeiro, Mateus Rosas; Jacomine, P. K. T.; Rodrigues, Jefferson; Marques, Flávio Adriano

doi:10.1590/s0100-06832002000200004

Cited by 48 publications

(73 citation statements)

References 16 publications

(18 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The values of organic matter, particle size distribution, and soil moisture are presented in dag kg -1 , which is numerically equal to weight percentage, to facilitate comparisons and reduce the conservative effect of the ME and RMSE statistical indicators for low degrees of moisture (OLIVEIRA et al, 2002). Such modification does not alter the accuracy of the PTFs.…”

Section: Methodsmentioning

confidence: 99%

“…(OLIVEIRA et al, 2002, MICHELON et al, 2010NEBEL et al, 2010). However, its direct measurement demands much time and money (TOMASELLA et al, 2000;SANTRA;DAS, 2008;TWARAKAVI et al, 2009); and it is many times made unfeasible by practical or financial restrictions (SCHAAP et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…However, its direct measurement demands much time and money (TOMASELLA et al, 2000;SANTRA;DAS, 2008;TWARAKAVI et al, 2009); and it is many times made unfeasible by practical or financial restrictions (SCHAAP et al, 2001). Furthermore, laboratory problems, delays and inaccuracy can often occur (OLIVEIRA et al, 2002). To overcome those difficulties, great efforts have been employed to determine pedotransfer functions (PTFs) for water retention estimative in soils.…”

Section: Introductionmentioning

confidence: 99%

“…Examples of PTFs can be seen in: Balland et al (2008) who proposed equations to estimate the water retention and the hydraulic conductivity from the particle size distribution and organic matter of the soil for a wide variety of soils in Canada; Khodaverdiloo et al (2011) who generated PTFs to estimate the water retention in the soil at various potentials for soils derived from limestone in Iran; and Tomasella et al (2000) who used various soil survey data in Brazil to generate PTFs to predict the water retention parameters of the van Genuchten equation and to estimate the water retention; among other works as in Oliveira et al (2002), and Piedallu et al (2011). Michelon et al (2010) generated PTFs for the RS State, however they utilized data from undisturbed samples.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Pedotransfer functions for water retention in different soil classes from the center-southern Rio Grande do Sul State

et al. 2013

View full text Add to dashboard Cite

Water retention in soil is used in many agronomic and environmental applications, but its direct measurement is timeconsuming and expensive. Therefore, pedotransfer functions (PTFs) are alternatives to obtain this information faster and more economically. The objectives of this study were to generate and validate PTFs to estimate the water content at potentials of -33 kPa (field capacity) and -1500 kPa (permanent wilting point) for different soil classes from the central-south portion of Rio Grande do Sul State. The physical and chemical analyses database from soil surveys of the Celulose Riograndense Corp were used. The database is composed of particle size distribution (coarse and fine sand, silt and clay), soil organic matter, and water content data at the above mentioned potentials, besides other information concerning the behavior of the soil classes at field conditions. Firstly, the data were stratified by soil classes and depths, and then 70% of the data were separated for PTF generation and 30% for validation. PTFs were generated for each specific soil class and also general PTFs which were not stratified by soil class, by means of stepwise multiple regression. In most situations, PTFs for a specific soil class showed a better fit than the general PTFs. Proper adjustment of the data showed that the water retention values at potentials of -33 kPa and -1500 kPa can be estimated for the soils from the central-south portion of Rio Grande do Sul State that do not have such analyses through the use of PTFs.Index terms: Permanent wilting point, field capacity, water retention curve. RESUMOA retenção de água no solo é utilizada em diversas aplicações agronômicas e ambientais, porém sua medição direta consome tempo e dinheiro. Por isso, funções de pedotransferência (FPTs) são alternativas para a obtenção dessas informações de forma mais rápida e econômica. Neste trabalho, objetivou-se gerar e validar FPTs, para estimar o conteúdo de água nos potenciais de -33 kPa (capacidade de campo) e -1500 kPa (ponto de murcha permanente) para diferentes classes de solos na porção centro-sul do Rio Grande do Sul. Utilizou-se o banco de dados de análises físicas e químicas dos levantamentos de solos da empresa Celulose Riograndense, que é composto por dados de textura (areia grossa e fina, silte e argila), matéria orgânica do solo e dados de conteúdo de água nos potenciais supracitados, entre outras informações sobre o comportamento das classes de solo em condições de campo. Primeiramente, os dados foram estratificados por classes de solos e profundidades e, posteriormente, 70% dos dados foram separados para geração das FPTs e 30% para validação. Geraram-se FPTs específicas para cada classe de solo e também FPTs gerais, sem estratificação por classe de solos, por meio de regressão múltipla stepwise. Na maioria das situações, as FPTs específicas por classe de solo apresentaram melhor ajuste do que as FPTs gerais. Na maioria dos casos, o ajuste adequado dos dados demonstrou que os valores de retenção de água nos potenciai...

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pedotransfer functions for water retention in different soil classes from the center-southern Rio Grande do Sul State

et al. 2013

View full text Add to dashboard Cite

show abstract

“…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%

Hydraulic characterization from porous aquifers of the Brazilian Federal District

2015

View full text Add to dashboard Cite

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

show abstract

Hydrological response of a Brazilian semi‐arid catchment to different land use and climate change scenarios: a modelling study

Montenegro

Ragab

2010

Hydrological Processes

View full text Add to dashboard Cite

Abstract:Brazilian semi-arid regions are characterized by water scarcity, vulnerability to desertification, and climate variability. The investigation of hydrological processes in this region is of major interest not only for water planning strategies but also to address the possible impact of future climate and land-use changes on water resources. A hydrological distributed catchmentscale model (DiCaSM) has been applied to simulate hydrological processes in a small representative catchment of the Brazilian northeast semi-arid region, and also to investigate the impact of climate and land-use changes, as well as changes associated with biofuel/energy crops production. The catchment is part of the Brazilian network for semi-arid hydrology, established by the Brazilian Federal Government. Estimating and modelling streamflow (STF) and recharge in semi-arid areas is a challenging task, mainly because of limitation in in situ measurements, and also due to the local nature of some processes. Direct recharge measurements are very difficult in semi-arid catchments and contain a high level of uncertainty. The latter is usually addressed by short-and long-time-scale calibration and validation at catchment scale, as well as by examining the model sensitivity to the physical parameters responsible for the recharge. The DiCaSM model was run from 2000 to 2008, and streamflow was successfully simulated, with a Nash-Sutcliffe (NS) efficiency coefficient of 0Ð73, and R 2 of 0Ð79. On the basis of a range of climate change scenarios for the region, the DiCaSM model forecasted a reduction by 35%, 68%, and 77%, in groundwater recharge (GWR), and by 34%, 65%, and 72%, in streamflow, for the time spans 2010-2039, 2040-2069, and 2070-2099, respectively, could take place for a dry future climate scenario. These reductions would produce severe impact on water availability in the region. Introducing castor beans to the catchment would increase the GWR and streamflow, mainly if the caatinga areas would be converted into castor beans production. Changing an area of 1000 ha from caatinga to castor beans would increase the GWR by 46% and streamflow by 3%. If the same area of pasture is converted into castor beans, there would be an increase in GWR and streamflow by 24% and 5%, respectively. Such results are expected to contribute towards environmental policies for north-east Brazil (NEB), and to biofuel production perspectives in the region.

show abstract

Funções de pedotransferência para predição da umidade retida a potenciais específicos em solos do estado de Pernambuco

Cited by 48 publications

References 16 publications

Pedotransfer functions for water retention in different soil classes from the center-southern Rio Grande do Sul State

Pedotransfer functions for water retention in different soil classes from the center-southern Rio Grande do Sul State

Hydraulic characterization from porous aquifers of the Brazilian Federal District

Hydrological response of a Brazilian semi‐arid catchment to different land use and climate change scenarios: a modelling study

Contact Info

Product

Resources

About