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

Silva, Valdemir P.; Montenegro, Abelardo Antônio de Assunção; Melo, R. O. de

doi:10.1590/1807-1929/agriambi.v20n10p880-885

Cited by 9 publications

(8 citation statements)

References 14 publications

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“…Additionally, the authors observed higher soil water contents in areas where Caatinga is present, compared to bare soil regions. Such results are consistent with those obtained by Silva Júnior et al (2016), evaluating near surface soil moisture temporal stability (from 0 to 0.10 and from 0 to 0.20 m), comparing sites with pasture cover, bare soils and Caatinga Natural cover in the Jatobá Experimental Basin, Figure 6. Time series for the mean soil moisture, for native vegetation (Caatinga), for the 0-0.10, 0.10-20, 0.20-0.30, 0.30-0.40 m layers.…”

Section: Resultssupporting

confidence: 90%

Spatio Temporal Soil Moisture Dynamics and Runoff under Different Soil Cover Conditions in a Semiarid Representative Basin in Brazil

et al. 2019

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Abstract. Hydrological studies in small basins are essential for investigating the role of distinct processes on water resources conservation and to assess the impact of the natural ecosystems on improving water security especially in semiarid environments. In Brazil, the cooperative hydrological Network REHISA (“REde de HIdrologia do SemiÁrido”) comprises hydrologists from several universities of Brazil, focusing on field measurements, monitoring and modeling activities in well instrumented experimental rural catchments located at different regions and biomes in Semiarid environment. Water scarcity is a common aspect among the catchments, as well as risks of soil and water degradation. The objective of this work is to present assessments of near surface soil moisture spatial-temporal distribution, and to evaluate the impact of soil conservation techniques in reducing runoff, using small-scale experimental plots in a representative catchment of the Pernambuco State, Brazil. The study catchment is located in Alto Ipanema River Basin (AIRB) (with an area of 150 km2), which is located at the semiarid region of the São Francisco River (area of 641 000 km2). Soil and water monitoring was performed in experimental plots with different soil cover conditions (Bare soil plots; Plots with natural cover – Caatinga Biome vegetation; Plots with cactus Palma barriers; and Plots with mulch cover – Dry grass mulch at 4 t ha−1), where probes were installed for high resolution soil moisture assessment. In addition, regular soil moisture monitoring campaigns were conducted at 7 different locations, using a capacitance probe, with arboreal and shrub Caatinga vegetation, pasture and bare soil, predominantly Brachiaria decumbens. Mulch cover runs close to the Caatinga cover, but still with higher runoff generation, and presenting lower soil moisture temporal mean values. Caatinga was highly effective in terms of soil and water conservation at the small basin scale for both the dry and the wet season, resulting in a positive nexus between vegetation and water availability at the region.

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Section: Resultssupporting

confidence: 90%

Spatio Temporal Soil Moisture Dynamics and Runoff under Different Soil Cover Conditions in a Semiarid Representative Basin in Brazil

et al. 2019

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“…The basin has total area of 149 km², with mean rainfall and temperature of 600 mm and 23 ºC, respectively. Potential annual evapotranspiration is approximately 2000 mm (Silva Junior et al, 2016).…”

Section: Methodsmentioning

confidence: 99%

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

Araújo

Montenegro

et al. 2018

Rev. bras. eng. agríc. ambient.

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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.

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“…Moreover, half of the addressed networks showed minimal spatial variability in moderate SM conditions when considering temporal anomalies. Souza et al (2011) have applied the SM-relative differences ranking to identify sites in the Brazilian semi-arid that could reproduce the mean SM spatial pattern for agricultural water management purposes, while Silva Junior et al (2016), Melo and Montenegro (2015), and Silva et al (2015) have investigated the SM temporal dynamics and verified the importance of SM temporal stability studies for reducing Rev Bras Cienc Solo 2019;43:e0180236 hydrological monitoring costs under different land cover and soil types. Concerning the impact of SM temporal dynamics, Costa et al (2016) have investigated the permanence of soil water effectiveness under preserved-vegetation constraints in three semi-arid soil types.…”

Section: Introductionmentioning

confidence: 99%

Stability of Soil Moisture Patterns Retrieved at Different Temporal Resolutions in a Tropical Watershed

Barbosa

Lira

Coelho

et al. 2019

Rev. Bras. Ciênc. Solo

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Above and underground hydrological processes depend on soil moisture (SM) variability, driven by different environmental factors that seldom are well-monitored, leading to a misunderstanding of soil water temporal patterns. This study investigated the stability of the SM temporal dynamics to different monitoring temporal resolutions around the border between two soil types in a tropical watershed. Four locations were instrumented in a small-scale watershed (5.84 km 2) within the tropical coast of Northeast Brazil, encompassing different soil types (Espodossolo Humilúvico or Carbic Podzol, and Argissolo Vermelho-Amarelo or Haplic Acrisol), land covers (Atlantic Forest, bush vegetation, and grassland) and topographies (flat and moderate slope). The SM was monitored at a temporal resolution of one hour along the 2013-2014 hydrological year and then resampled a resolutions of 6 h, 12 h, 1 day, 2 days, 4 days, 7 days, and 15 days. Descriptive statistics, temporal variability, time-stability ranking, and hierarchical clustering revealed uneven associations among SM time components. The results show that the time-invariant component ruled SM temporal variability over the time-varying parcel, either at high or low temporal resolutions. Time-steps longer than 2 days affected the mean statistical metrics of the SM time-variant parcel. Additionally, SM at downstream and upstream sites behaved differently, suggesting that the temporal mean was regulated by steady soil properties (slope, restrictive layer, and soil texture), whereas their temporal anomalies were driven by climate (rainfall) and hydrogeological (groundwater level) factors. Therefore, it is concluded that around the border between tropical soil types, the distinct behaviour of time-variant and time-invariant components of SM time series reflects different combinations of their soil properties.

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

Cited by 9 publications

References 14 publications

Spatio Temporal Soil Moisture Dynamics and Runoff under Different Soil Cover Conditions in a Semiarid Representative Basin in Brazil

Spatio Temporal Soil Moisture Dynamics and Runoff under Different Soil Cover Conditions in a Semiarid Representative Basin in Brazil

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

Stability of Soil Moisture Patterns Retrieved at Different Temporal Resolutions in a Tropical Watershed

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