Assessment of Soil Loss Susceptibility in Santa Rita Watershed in Southern Brazil

Zanchin, Mayara; Moura, Maíra Martim de; Nunes, Maria Cândida Moitinho; Tuchtenhagen, Ivana Kruger; Lima, Cláudia Liane Rodrigues de

doi:10.1590/1809-4430-eng.agric.v41n4p485-495/2021

Cited by 3 publications

(3 citation statements)

References 33 publications

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“…As is characteristic of the class of Argissolos (Acrisols), the clay content increases in depth, resulting in a textural relationship ranging from 1.55 to 2.25, which suggests the occurrence of clay eluviation and the presence of the textural (argilic) B horizon, corroborating with the results obtained by Lima et al (2016), Costa et al (2021) and Zanchin et al (2021b).…”

Section: Physical and Morphological Characteristics Of Soilssupporting

confidence: 85%

Soil-Landscape Relationship in a Watershed Located on Pleistocenic Terraces and Fluvio-Lagunarian Sediments in Municipality of Recife, Brazil

Caldas,

Rolim Neto,

Parahyba

et al. 2023

Eng. Agríc.

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In the Prata watershed there are units corresponding to the Pleistocene Terraces and the Fluvium-Lagoon Sediments. This watershed is inserted almost entirely in the area of plateaus (Tabuleiros) with altitudes of 10 to 100 meters, and in areas with altitudes of 2 to 10 meters in the area of floodplains and fluvio-lagoon terraces. The present work aimed to characterize and classify soils in the Brazilian Soil Classification System -SiBCS and correlate them with the IUSS Working Group WRB-FAO (in parentheses), besides evidence some soil-landscape relations, that occur in Pleistocene terraces and fluviumlagoon sediments in the Prata watershed, located in the ecological reserve of Dois Irmãos State Park in Recife -PE, Brazil. Soil samples were used to perform physical, chemical and mineralogical analysis in laboratory. Watershed delimitation, Digital Elevation Model (DEM), slope map, soil map and slope x soil map were obtained and studied. The soils are quite acidic and have a very low natural fertility, with the Latossolos (Ferralsols) predominating in the landscape. The silt and clay fractions of the studied Argissolos (Acrisols) and Latossolos (Ferralsols) presented quartz and kaolinite as the main component. In the profile of Neossolo Quartzarênico (Arenosols) only quartz was identified as a component of the silt and clay fractions. The kaolinitic mineralogy of the clay fraction is consistent with the environment of its formation, that is, hot and humid. There is no relationship between the colors of soils and their exposure to the sun on the slopes where they occur. The occurrence of a sandy and whitish horizon between the litter and the A horizon, is not foreseen in the norms and criteria adopted in the Brazilian Soil Classification System -SiBCS.

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Section: Physical and Morphological Characteristics Of Soilssupporting

confidence: 85%

Soil-Landscape Relationship in a Watershed Located on Pleistocenic Terraces and Fluvio-Lagunarian Sediments in Municipality of Recife, Brazil

Caldas,

Rolim Neto,

Parahyba

et al. 2023

Eng. Agríc.

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“…The increase in population and the development of urban areas have led to an increase in impermeable soils and excessive waste generation. This increase is related to the degradation of water resources, a consequence of surface runoff of rainwater, leading the materials disposed on urban surfaces to watercourses (Yang et al, 2016;Zanchin et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Precipitation causes an initial wetting on the surface and this layer is infiltrated (Oliveira et al, 2018;Zanchin et al, 2021). The dissolution of deposited soluble elements begins in this phase and runoff begins after passing the wetting phase.…”

Section: Introductionmentioning

confidence: 99%

Light Rain Characterization in Piracicaba, São Paulo State, Brazil

Johanson¹,

Farias-Ramirez²,

Jacomazzi³

et al. 2023

Eng. Agríc.

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The disorderly soil occupation without the necessary conservationist practices leads to impacts on the local hydrology and induces the pollution of water resources. This pollution may come from more urbanized areas due to the amount of pollutants drained during the rains. Even moderate precipitations constitute one of the main factors that define pollutant runoff on the surface. These rains have recently been called light rains. Light rains have a lower precipitation height and a higher frequency compared to classic rains of drainage projects, being necessary to define them according to patterns of rain frequency for each region. This study aimed to characterize light rain in the municipality of Piracicaba to establish statistical standards for the frequency of certain precipitation heights. A database provided by the ESALQ/USP automatic weather station, which provides precipitation measurements every 15 minutes, was used in the present study. Light rain heights reached 40.3, 41.4, and 42.7 mm for 100, 90, or 80% frequencies, respectively, which implies the use of return periods of 1.00, 1.11, and 1.25 years, respectively.

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Modeling of Soil Loss by Water Erosion and Its Impacts on the Cantareira System, Brazil

Lense

Lämmle

Ayer³

et al. 2023

Water

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The Cantareira System is one of the largest water supply systems in the world, supplying about half of the water consumed by 22 million inhabitants in the Metropolitan Region of São Paulo, in southeastern Brazil. In this scenario, in view of climate change, silting is a serious environmental threat and a major challenge to the sustainability of water reservoirs. Therefore, identifying the provenance of sediments is an essential tool to support soil conservation policies, slowing erosion processes and mitigating the deposition of sediments in water reservoirs. Thus, this study aimed to model soil losses—sediment production, by water erosion in the Cantareira System, based on the RUSLE model—Revised Universal Soil Loss Equation, GIS—Geographic Information System and SR—Remote Sensing. The work was conducted on data obtained from online platforms of Brazilian public institutions. The results indicate an average rate of soil loss of 13 Mg ha−1 yr−1, which corresponds to an annual loss of 3 million tons, of which 22% reaches water bodies. The data also show that: (1) in 66 % of the Cantareira System, soil losses are below the soil loss tolerance limits, and, in 34% of the region, water erosion is compromising the sustainability of water and soil resources; (2) the areas with the greatest soil losses are predominantly located in planted forests, agricultural crops and non-vegetated areas; and (3) sectors with high rates of soil loss require the adoption of conservationist practices aimed at reducing sediment production rates and thereby increasing supply and improving water quality.

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Assessment of Soil Loss Susceptibility in Santa Rita Watershed in Southern Brazil

Cited by 3 publications

References 33 publications

Soil-Landscape Relationship in a Watershed Located on Pleistocenic Terraces and Fluvio-Lagunarian Sediments in Municipality of Recife, Brazil

Soil-Landscape Relationship in a Watershed Located on Pleistocenic Terraces and Fluvio-Lagunarian Sediments in Municipality of Recife, Brazil

Light Rain Characterization in Piracicaba, São Paulo State, Brazil

Modeling of Soil Loss by Water Erosion and Its Impacts on the Cantareira System, Brazil

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