Variabilidade espacial de classes de textura, salinidade e condutividade hidráulica de solos em planície aluvial

Rev. bras. eng. agríc. ambient.

et al. 2018

Self Cite

A B S T R A C TThis study aimed to evaluate the spatial patterns of physical and chemical properties of a soil in an experimental basin with an area of 149 km 2 , located in the municipality of Pesqueira, in the semi-arid region of Pernambuco state (Brazil). Samples were taken in the layers of 0-0.10 and 0.10-0.20 m, at 35 monitoring points distributed in an irregular grid, encompassing the three soil classes present in the basin and commonly found in the semi-arid region. For the attributes of soil texture, organic carbon and bulk density in the layer of 0.10-0.20 m, spatial dependence from medium to strong was detected, ranging from 0.03 to 49.98%. Bulk density in the layer 0-0.10 m, as well as the electrical conductivity, in both layers, showed pure nugget effect, possibly due to insufficient sampling distance to capture spatial dependence. However, geostatistics represented well the spatial dynamics of soil attributes at points where the mapping is possible.Variabilidade espacial de atributos de solo em uma bacia experimental do Semiárido pernambucano, Brasil R E S U M O Objetivou-se neste estudo avaliar os padrões espaciais de variação de atributos físicos e químicos do solo em uma bacia experimental com área de 149 km 2 , localizada no município de Pesqueira, semiárido Pernambucano (Brasil). As amostragens foram feitas nas profundidades de 0-0,10 e 0,10-0,20 m, em 35 pontos distribuídos em malha irregular, englobando as três classes de solo presentes na bacia e comumente encontradas no semiárido. Os dados foram analisados com base na estatística descritiva e técnicas geoestatísticas. Para os atributos textura do solo, carbono orgânico e densidade do solo na camada de 0,10-0,20 m, foi detectado grau de dependência espacial de médio a forte, variando de 0,03 a 49,98%. A densidade do solo na camada de 0-0,10 m, assim como a condutividade elétrica, nas duas camadas apresentaram efeito pepita puro, possivelmente devido a uma distância de amostragem insuficiente para captar dependência espacial. No entanto, a geoestatística representou bem a dinâmica espacial de atributos de solo nos pontos em que o mapeamento foi possível. 39Spatial variability of soil attributes in an experimental basin in the semi-arid region of Pernambuco, Brazil R. Bras. Eng.

Section: Resultssupporting

confidence: 82%

“…Montenegro & Montenegro (2006) conducted a study on the spatial variability of soil textural classes, salinity and electrical conductivity on an alluvial plain of the Pernambuco semi-arid region, and found that geostatistics represented well the spatial correlation between the studied attributes.…”

Section: Introductionmentioning

confidence: 99%

Spatial variability of soil attributes in an experimental basin in the semi-arid region of Pernambuco, Brazil

Araújo

Rev. bras. eng. agríc. ambient.

et al. 2018

Self Cite

“…The predominant vegetation is hyperxerophilic Caatinga (Montenegro & Montenegro, 2006), an exclusively Brazilian biome.…”

Section: Methodsmentioning

confidence: 99%

Temporal stability of soil moisture in an experimental watershed in the Pernambuco semi-arid region

Silva

Rev. bras. eng. agríc. ambient.

Melo

2016

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A B S T R A C TSoil moisture estimation is very important in decision making regarding agricultural practices and investigations in hydrology. The aim of the study was to evaluate surface soil moisture temporal stability under two cover crop conditions in an experimental watershed in the Brazilian semi-arid region, aiming to identify stable points, thus reducing monitoring costs and highlighting the importance of temporal stability in a watershed. Fourty five soil moisture monitoring campaigns in the layers of 0-0.10 and 0.10-0.20 m were conducted using a capacitance probe (Diviner -2000®) during the period from 10/07/2010 to 03/25/2014, with soil cover under native bushy vegetation and degraded pasture, predominantly Brachiaria decumbens. Temporal stability was evaluated through the mean relative difference technique. The point located at the middle of a slope under pasture and bushes was the most stable, with determination coefficient of 90 and 92% for both layers.Estabilidade temporal da umidade do solo em bacia experimental do semiárido pernambucano R E S U M O A estimativa da umidade no solo é de grande relevância na tomada de decisão de práticas agrícolas e pesquisas na área da hidrologia. Objetivou-se, neste estudo, avaliar a estabilidade temporal da umidade do solo nas camadas superficiais em duas condições de cobertura vegetal em uma bacia hidrográfica experimental, no semiárido brasileiro, buscando-se identificar pontos com maior estabilidade da umidade desonerando, assim, custos de monitoramento e ressaltando a importância da estabilidade temporal em uma bacia hidrográfica. Realizaram-se 45 campanhas de monitoramento de umidade do solo nas camadas de 0-0,10 e 0,10-0,20 m utilizando a sonda capacitiva/Diviner -2000® no período de 07/10/2010 a 25/03/2014, com cobertura do solo e presença de vegetação arbustiva natural, além de pastagem degradada com predominância de capim Braquiária (Brachiaria decumbens). A estabilidade temporal foi avaliada por meio da diferença relativa média. O ponto localizado em meia-encosta da bacia em presença de pastagem foi o mais estável, com coeficientes de determinação de 90 e 92% para ambas as camadas.

“…The annual mean rainfall is 607 mm, mean temperature of 23 ºC and the potential evapotranspiration is about 2,000 mm per year. The dominant vegetation is hypoxerophilous caatinga (Montenegro & Montenegro, 2006).…”

Section: Characterization Of the Study Areamentioning

confidence: 99%

Temporal variability of soil water content under different surface conditions in the semiarid region of the Pernambuco state

Santos

Silva

2010

Rev. Bras. Ciênc. Solo

SUMMARYRainfall in the semiarid region of Pernambuco is characterized by irregular distribution in time and space, which significantly hinders the rainfed agriculture in the region. This work aims to evaluate the temporal profile of soil moisture in the semiarid region of the Pernambuco State (Brazil) and the effect of different soil surface conditions on soil water content variation and the yield of rainfed beans. To monitor soil water content, five plots 4.5 m wide by 11 m long were installed in a Yellow Argisol (Ultisol). The following treatments were adopted in the experimental plots: natural vegetation, bean intercropped with cactus, beans planted down the slope, beans planted along contour lines with mulch and rock barriers, and bare soil. In each plot, eight PVC access tubes were installed for monitoring the soil water content profile at depths of 0.20 and 0.40 m using a neutron probe device. The surface condition significantly influenced the soil water content variation, both in the dry and rainy seasons. The use of mulch, associated with rock barriers, provided higher soil water content levels than the other treatments and increased the rainfed beans production.Index terms: moisture profile, soil cover, antecedent rainfall.(