Composição química das águas pluviais e deposição atmosférica anual na bacia do Alto Sorocaba (SP)

Conceição, Fabiano Tomazini da; Sardinha, Diego de Souza; Navarro, Guillermo Rafael Beltran; Antunes, Maria Lúcia Pereira; Angelucci, Vivian Andréa

doi:10.1590/s0100-40422011000400011

Cited by 27 publications

(14 citation statements)

References 15 publications

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“…While the highest proportion of urban areas belongs to sector P1 (18.4%), agricultural and silviculture lands affect most of sectors P6 (with 18.1% and 5.4%, respectively) and P7 (with 17.2% and 10.1%, respectively). The main crops cultivated in the catchment are corn, potatoes, tomatoes, vegetables, and sugarcane (Conceição et al, ; Smith et al, ).…”

Section: Resultsmentioning

confidence: 99%

Self‐Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs

Melo

Gontijo

Frascareli

et al. 2019

Water Resources Research

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Water quality in reservoirs is often compromised in many regions worldwide by nutrients and trace metals. This demands continuous monitoring; however, analyses of large data sets collected during regular monitoring remain a difficult task. Multivariate techniques offer a fast and robust approach for interpreting complex results. The objective of this study was to check the efficacy of selforganizing maps (SOMs) as a tool to investigate biogeochemical processes. This tool can also help to illustrate influences of land use patterns on the water quality of reservoirs. Here we use the Itupararanga Reservoir in Brazil as a subtropical example. Vertical profiles were sampled from seven sites in the reservoir in a total of seven campaigns over 24 months. Next to physicochemical parameters in the water column (dissolved oxygen, Eh, pH, and temperature), levels of nutrients (NO 3 − , NH 4 + , and PO 4 3− ), transition and trace metals (Al, Ba, Ca, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, and Zn), and chlorophyll-a (Chla) were measured. These variables were correlated with land use using SOM. With this technique samples were classified into 17 distinct groups that showed distinct influences of spatial heterogeneity and seasonality. The analyses helped to reveal a seasonal stratification period, where Fe, Mn, and P were released from sediments. Nutrients and some metal inputs (Al and Fe) were related to agricultural, urban, and grass/pasture areas around the reservoir. Our approach also helped to explain physical and biogeochemical seasonality in the reservoir.

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Section: Resultsmentioning

confidence: 99%

Self‐Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs

Melo

Gontijo

Frascareli

et al. 2019

Water Resources Research

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“…In terms of enrichment of the cations, Ca, Mg, and K in the soil, an important observation is the input of Ca, Mg, and K via rainfall. Conceição, Sardinha, Navarro, Antunes, and Angelucci () verified that for the region where the study was conducted, the annual input of Ca is 3.71 ton/km 2 ; of Mg, 0.40 ton/km 2 ; and of K, 0.73 ton/km 2 . On the one hand, in our experiments soil nutrients were not absorbed by plants because the plants were missing from the soil during the experiment.…”

Section: Discussionmentioning

confidence: 75%

Jute bioblanket as a soil rehabilitation strategy in Sorocaba, Brazil: Soil chemistry and SWOT approaches

Silva

Tsuchiya

Mendes

et al. 2019

Environmental Quality Mgmt

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Soil erosion and the invasion of exotic plant species are major constraints to achieve sustainable development around the world. Currently, we find few products devoted concomitantly to combatting soil erosion as well as the establishment of unwanted exotic plants. In this paper, we introduce a new product, called herein a bioblanket, that protects the soil and impedes the establishment of exotic plant species. This product is of simple design, and to manufacture it, we use two biodegradable materials: jute tissue and grass wastes. We designed this product to combat soil erosion and the germination and establishment of new, unwanted, invasive plant species. In this paper, we describe our evaluation of how successful this product was in terms of improving the chemical attributes of soil. We also identified the product's potentialities and weaknesses by means of strengths, weaknesses, opportunities, and threats (SWOT) analysis. The bioblanket ameliorated the chemical attributes of the soil, as evidenced especially by the neutralization of acidity (8.5%) and aluminum toxicity (33%), and by an increment in nutrients concentration. We argue that after adequate treatment and management, the residues of plants that are normally considered unwanted materials can be transformed into a raw material to control the propagation of unwanted plant species, and concomitantly control soil erosion while improving the chemical conditions of the soil. The improvement of the soil chemical attributes was one of the main positive effects reported through the SWOT analysis. In addition, the SWOT analysis revealed some features that need improvement in future generations of the product, but we argue that these features do not impede the benefits for the use of the product in its present form.

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“…São Paulo State is considered potentially problematic area due to the intense industrial activities The annual flux of dissolved chemical species in the Upper Sorocaba basin due to atmospheric inputs was studied by Conceição et al (2011), which indicated that the pH varied from 5.5 to 6.8, being Ca 2+ the main ion responsible for controlling the rainwater pH, with the ionic concentrations decreased in the following order: Ca 2+ N Na + N Mg 2+ N K + for cations and SO 4 ). To correct the atmospheric inputs (F wetfall and F dryfall ), it was used the annual atmospheric flux of dissolved cations and anions and TDS in the Upper Sorocaba River basin obtained by Conceição et al (2011). Sardinha et al (2008) evaluated the annual flux of cations and anions at Upper Sorocaba River basin, indicating how anthropogenic influences are affecting these values.…”

Section: Atmospheric Inputsmentioning

confidence: 99%

Chemical weathering rates and atmospheric/soil CO2 consumption of igneous and metamorphic rocks under tropical climate in southeastern Brazil

et al. 2016

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Chemical weathering rates and atmosphere/soil CO 2 consumption of igneous and metamorphic rocks under tropical climate in southeastern Brazil were evaluated using the chemical composition of surface waters and fresh rocks and soil (horizon C) in the Upper Sorocaba River basin. Surface water samples were collected between June/2009 and June/2010, and analyses were performed to assess pH, electrical conductivity (EC), temperature and total dissolved solids (TDS), including Na + , K + , Ca 2+ , Mg 2+ , Cl − , SO 4 2− , PO 4 3− , NO 3 − and SiO 2 . Fresh rocks and C horizon samples were also collected, taking into account their geological context, abundance and spatial density, to analyze major elements and mineralogy. The concentration of TDS and dissolved cations, anions and silica increased during the dry period in relation to the wet period, and the same behavior was observed for pH, EC and temperature. After corrections of anthropogenic contributions (ca. 21 t/km 2 /yr) and atmospheric inputs (ca. 19 t/km 2 /yr), the annual flux due to chemical weathering involving the igneous and metamorphic rocks was ca. 29 t/km 2 /yr. The CO 2 atmospheric/soil consumption in the Upper Sorocaba River basin was ca. 0.2 × 10 6 mol/km 2/ yr, and when extrapolated to the entire Mantiqueira Orogenic Belt, accounted an estimated consumption of 0.07 × 10 12 mol/yr, representing 0.6% of the total CO 2 consumption flux derived from global average silicate weathering. The chemical weathering rates of igneous and metamorphic rocks in the Upper Sorocaba River basin were estimated at 15 m/My, respectively. The main weathering process in this watershed was the monossialitization, with partial hydrolyses of bedrock minerals, except quartz, which was not weathered and remained in the soil profile. The annual specific flux derived from igneous and metamorphic rocks at Upper Sorocaba River basin could be compared with watersheds in tropical climates. However, this value is higher than in other North American, European, Asian and African granitoid watersheds, and lower than in montane watersheds. Anthropogenic and atmospheric influence Water-rock interactions the basic function of moderating the Earth's climate. The physical erosion is related to soil loss, acts on the weathered surface by removing the cover and carrying the particulate matter. In both processes, the dissolved and particulate materials are transported through rivers to the oceans, resulting in the deposition of Ca and Mg carbonates (and smaller amounts of Fe and Mn) and sediments, respectively.The chemical weathering can be evaluated from the silica mass balance or from models using the dissolved sodium, calcium, potassium, magnesium and silica and total dissolved load concentrations, where inputs from rainfall require corrections (Amiotte-Suchet and Probst, 1993; Bain et al.

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Composição química das águas pluviais e deposição atmosférica anual na bacia do Alto Sorocaba (SP)

Cited by 27 publications

References 15 publications

Self‐Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs

Self‐Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs

Jute bioblanket as a soil rehabilitation strategy in Sorocaba, Brazil: Soil chemistry and SWOT approaches

Chemical weathering rates and atmospheric/soil CO2 consumption of igneous and metamorphic rocks under tropical climate in southeastern Brazil

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