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Article ; Online: Assessment of the impact of conservation measures by modeling soil loss in Minas Gerais, Brazil.

Soares, A K M / Crestana, S / Ferreira, R R M / Rodrigues, V G S

2024 Volume 196, Issue 4, Page(s) 358

Abstract: Gullies are significant contributors to soil degradation in several regions of Brazil, including Minas Gerais, where erosion processes have caused soil loss. The characterization of erosion processes is crucial for the application of measures for ... ...

Abstract	Gullies are significant contributors to soil degradation in several regions of Brazil, including Minas Gerais, where erosion processes have caused soil loss. The characterization of erosion processes is crucial for the application of measures for recovering degraded areas and reducing erosion impacts. This study models soil loss with the use of InVEST software and assesses the impact of three different scenarios, namely (1) implementation of soil conservation practices and replacement of pasture areas for temporary agriculture, (2) reforestation of pasture areas, and (3) preservation of ciliary forests. Soil loss, sediment exportation, retention, and deposition for the present scenario (2019), as well as the three aforementioned hypothetical scenarios, were estimated. In the present scenario, the estimated mean annual soil loss was 2.75 t/ha year, with 1,449.54 t/year sediment exportation, 9,042.13 t/year retention, and 1,449.54 t/year deposition. The model predicted scenario 1 would result in 2.23 t/ha year mean annual soil loss, 1,300.59 t/year sediment exportation, 9,191.08 t/year retention, and 11,755.76 t/year deposition. Scenario 2 showed 1.92 t/ha year mean annual soil loss, 1,046.69 t/year sediment exportation, 9,444.98 t/year retention, and 10,229.77 t/year deposition, whereas the results for scenario 3 were 2.36 t/ha year, 616.65 t/year, 9,862.06 t/year, and 13,206.47 t/year, respectively. Reforestation and preservation of ciliary forests, along with soil conservation practices, were effective measures for reducing soil loss. Such findings are valuable for the management of areas degraded by erosion processes.
MeSH term(s)	Soil ; Brazil ; Conservation of Natural Resources/methods ; Environmental Monitoring/methods ; Agriculture/methods
Chemical Substances	Soil
Language	English
Publishing date	2024-03-12
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	782621-7
ISSN	1573-2959 ; 0167-6369
ISSN (online)	1573-2959
ISSN	0167-6369
DOI	10.1007/s10661-024-12509-1
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Article ; Online: Evaluation of gully development over several years using GIS and fractal analysis: a case study of the Palmital watershed, Minas Gerais (Brazil).

Real, L S C / Crestana, S / Ferreira, R R M / Rodrigues, V G S

Environmental monitoring and assessment

2020 Volume 192, Issue 7, Page(s) 434

Abstract: Soil erosion affects agricultural production by reducing the area of rural properties and altering the dynamics of watersheds. Gullies are a complex and irregular type of erosion form that can reach large dimensions, and studying gullies to stabilize ... ...

Abstract	Soil erosion affects agricultural production by reducing the area of rural properties and altering the dynamics of watersheds. Gullies are a complex and irregular type of erosion form that can reach large dimensions, and studying gullies to stabilize erosion processes is a challenge. This study aims to understand their environmental relationships as a basis for future research and to recover land degraded by soil erosion. We combined mapping techniques using geographic information system (GIS) with temporal evolution of land use and fractal dimensions of gullies using FracLac to determine the stability of gullies in a watershed in south Minas Gerais (Brazil). We used R software to apply linear regressions and tested the statistics to verify the compatibility of the model. Environmental characteristics of the watershed contribute to the formation of gullies, but human activities influence the deflagration of these features. The temporal evolution of the land use demonstrated that nearly 50% of the watershed was used as pastures throughout the years, which contributed to soil degradation. The evolution of the fractal dimension showed fluctuations over the years, indicating that the gullies are not stable. The regressions suggest that the vegetation, geology, land use, channel order, and curvature may influence the fractal dimensions of gullies. We concluded that human activity influences the evolution of gullies; the use of techniques such as vegetation measures can contribute to the stabilization of gullies. We also concluded that fractal analysis is an interesting tool for performing environmental evaluations of irregular and complex features, such as gullies.
MeSH term(s)	Brazil ; Conservation of Natural Resources ; Environmental Monitoring ; Fractals ; Geographic Information Systems ; Soil
Chemical Substances	Soil
Language	English
Publishing date	2020-06-15
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	782621-7
ISSN	1573-2959 ; 0167-6369
ISSN (online)	1573-2959
ISSN	0167-6369
DOI	10.1007/s10661-020-08362-7
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Article: Evaluation of gully development over several years using GIS and fractal analysis: a case study of the Palmital watershed, Minas Gerais (Brazil)

Real, L. S. C / Crestana, S / Ferreira, R. R. M / Rodrigues, V. G. S

Environmental monitoring and assessment. 2020 July, v. 192, no. 7

2020

Abstract	Soil erosion affects agricultural production by reducing the area of rural properties and altering the dynamics of watersheds. Gullies are a complex and irregular type of erosion form that can reach large dimensions, and studying gullies to stabilize erosion processes is a challenge. This study aims to understand their environmental relationships as a basis for future research and to recover land degraded by soil erosion. We combined mapping techniques using geographic information system (GIS) with temporal evolution of land use and fractal dimensions of gullies using FracLac to determine the stability of gullies in a watershed in south Minas Gerais (Brazil). We used R software to apply linear regressions and tested the statistics to verify the compatibility of the model. Environmental characteristics of the watershed contribute to the formation of gullies, but human activities influence the deflagration of these features. The temporal evolution of the land use demonstrated that nearly 50% of the watershed was used as pastures throughout the years, which contributed to soil degradation. The evolution of the fractal dimension showed fluctuations over the years, indicating that the gullies are not stable. The regressions suggest that the vegetation, geology, land use, channel order, and curvature may influence the fractal dimensions of gullies. We concluded that human activity influences the evolution of gullies; the use of techniques such as vegetation measures can contribute to the stabilization of gullies. We also concluded that fractal analysis is an interesting tool for performing environmental evaluations of irregular and complex features, such as gullies.
Keywords	case studies ; computer software ; evolution ; fractal dimensions ; geographic information systems ; humans ; land use ; models ; soil erosion ; statistics ; vegetation ; watersheds ; Brazil
Language	English
Dates of publication	2020-07
Size	p. 434.
Publishing place	Springer International Publishing
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	782621-7
ISSN	1573-2959 ; 0167-6369
ISSN (online)	1573-2959
ISSN	0167-6369
DOI	10.1007/s10661-020-08362-7
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Article ; Online: Modelagem e simulacao

Villas-Boas, P.R. / Crestana, S. / Posadas, A.

2016

Keywords	fractals ; wavelets
Language	Portuguese
Publishing date	2016-03-23T13:08:58Z
Publisher	Embrapa
Publishing country	fr
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: Characterizing water fingering phenomena in soils using magnetic resonance imaging and multifractal theory

Posadas, A. / Quiroz, R. / Tannús, A. / Crestana, S. / Vaz, C. M.

eISSN: 1607-7946

2018

Abstract: The study of water movement in soils is of fundamental importance in hydrologic science. It is generally accepted that in most soils, water and solutes flow through unsaturated zones via preferential paths or fingers. This paper combines magnetic ... ...

Abstract	The study of water movement in soils is of fundamental importance in hydrologic science. It is generally accepted that in most soils, water and solutes flow through unsaturated zones via preferential paths or fingers. This paper combines magnetic resonance imaging (MRI) with both fractal and multifractal theory to characterize preferential flow in three dimensions. A cubic double-layer column filled with fine and coarse textured sand was placed into a 500 gauss MRI system. Water infiltration through the column (0.15×0.15×0.15 m 3 ) was recorded in steady state conditions. Twelve sections with a voxel volume of 0.1×0.1×10 mm 3 each were obtained and characterized using fractal and multifractal theory. The MRI system provided a detailed description of the preferential flow under steady state conditions and was also useful in understanding the dynamics of the formation of the fingers. The f(α) multifractal spectrum was very sensitive to the variation encountered at each horizontally-oriented slice of the column and provided a suitable characterization of the dynamics of the process identifying four spatial domains. In conclusion, MRI and fractal and multifractal analysis were able to characterize and describe the preferential flow process in soils. Used together, the two methods provide a good alternative to study flow transport phenomena in soils and in porous media.
Subject code	333
Language	English
Publishing date	2018-01-15
Publishing country	de
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Use of spectroscopic and imaging techniques to evaluate pretreated sugarcane bagasse as a substrate for cellulase production under solid-state fermentation.

Rodríguez-Zúñiga, Ursula Fabiola / Bertucci Neto, Victor / Couri, Sonia / Crestana, Silvio / Farinas, Cristiane Sanchez

Applied biochemistry and biotechnology

2014 Volume 172, Issue 5, Page(s) 2348–2362

Abstract: The enzymatic cocktail of cellulases is one of the most costly inputs affecting the economic viability of the biochemical route for biomass conversion into biofuels and other chemicals. Here, the influence of liquid hot water, dilute acid, alkali, and ... ...

Abstract	The enzymatic cocktail of cellulases is one of the most costly inputs affecting the economic viability of the biochemical route for biomass conversion into biofuels and other chemicals. Here, the influence of liquid hot water, dilute acid, alkali, and combined acid/alkali pretreatments on sugarcane bagasse (SCB) used for cellulase production was investigated by means of spectroscopic and imaging techniques. Chemical composition and structural characteristics, such as crystallinity (determined by X-ray diffraction), functional groups (Fourier transform infrared spectroscopy), and microstructure (scanning electron microscopy), were used to correlate SCB pretreatments with enzymatic biosynthesis by a strain of the filamentous fungus Aspergillus niger under solid-state fermentation. The combined acid/alkali pretreatment resulted in a SCB with higher cellulose content (86.7%). However, the high crystallinity (74%) of the resulting biomass was detrimental to microbial uptake and enzyme production. SCB pretreated with liquid hot water yielded the highest filter paper cellulase (FPase), carboxymethyl cellulase (CMCase), and xylanase activities (0.4, 14.9, and 26.1 U g(-1), respectively). The results showed that a suitable pretreatment for SCB to be used as a substrate for cellulase production should avoid severe conditions in order to preserve amorphous cellulose and to enhance the physical properties that assist microbial access.
MeSH term(s)	Aspergillus niger/metabolism ; Biofuels ; Cellulase/biosynthesis ; Cellulose/metabolism ; Cellulose/ultrastructure ; Crystallization ; Endo-1,4-beta Xylanases/biosynthesis ; Ethanol/metabolism ; Fermentation ; Hot Temperature ; Hydrolysis ; Microscopy, Electron, Scanning ; Saccharum/chemistry ; Sodium Hydroxide/chemistry ; Spectroscopy, Fourier Transform Infrared ; Sulfuric Acids/chemistry ; Water ; X-Ray Diffraction
Chemical Substances	Biofuels ; Sulfuric Acids ; Water (059QF0KO0R) ; Ethanol (3K9958V90M) ; Sodium Hydroxide (55X04QC32I) ; Cellulose (9004-34-6) ; bagasse (9006-97-7) ; Cellulase (EC 3.2.1.4) ; carboxymethylcellulase (EC 3.2.1.4) ; Endo-1,4-beta Xylanases (EC 3.2.1.8) ; sulfuric acid (O40UQP6WCF)
Language	English
Publishing date	2014-03
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	392344-7
ISSN	1559-0291 ; 0273-2289
ISSN (online)	1559-0291
ISSN	0273-2289
DOI	10.1007/s12010-013-0678-0
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Article: 2-D and 3-D Fingering in unsaturated soils investigated by fractal analysis, invasion percolation modeling and non-destructive image processing

Crestana, S / Posadas, A.N.D

Fractals in soil science /

1998

Keywords	mathematics and statistics ; soil science ; soil physics ; soil chemistry
Language	English
Size	p. 293-332.
Publisher	CRC Press, c1998.
Publishing place	Boca Raton
Document type	Article
Note	Edited by P. Baveye, J.Y. Parlange, B.A. Stewart.
ISBN	1566701058 ; 9781566701051
Database	NAL-Catalogue (AGRICOLA)

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Article: Laser-induced breakdown spectroscopy to determine soil texture: A fast analytical technique

Villas-Boas, P. R. / Romano, R. A. / de Menezes Franco, M. A. / Ferreira, E. C. / Ferreira, E. J. / Crestana, S. / Milori, D. M. B. P.

Geoderma

2016 Volume -, Issue 263, Page(s) 195

Language	English
Document type	Article
ZDB-ID	281080-3
ISSN	0016-7061
Database	Current Contents Nutrition, Environment, Agriculture

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Article: Pesticide exposure and cancer among rural workers from Bariri, Sao Paulo State, Brazil.

de Brito Sá Stoppelli, Illona Maria / Crestana, Sílvio

Environment international

2005 Volume 31, Issue 5, Page(s) 731–738

Abstract: This article reports an environmental health study on risk identification. It discusses risk factors linked to rural work and pesticide contact in a restricted geographic area and shows the necessity of improving rural workers' health in the central part ...

Abstract	This article reports an environmental health study on risk identification. It discusses risk factors linked to rural work and pesticide contact in a restricted geographic area and shows the necessity of improving rural workers' health in the central part of Sao Paulo State. The municipality of Bariri, which is the case studied in this research, typifies this agriculturally based region. The study focuses on environmental problems engendered by modern agriculture that may have human-health repercussions such as cancer, as indicated by hard statistical association on an extended cause-effect time scale. For specific cases, the research used a database containing records of Amaral Carvalho Hospital, located in the city of Jau and a highly respected regional reference unit for over 85 years as one of the best in the Brazilian public health system for treating cancer. Statistics for age and gender were analyzed; relative risk was calculated for a group of cases registered from 2000 to 2002, as well as for a randomly selected control group from the same hospital. A map indicating the residences of cases (68) and non-cases (60) was made by geoprocessing techniques. For the period of time and the group studied, the authors concluded that the cancers of the skin and digestive system were the most prevalent. Bariri presented 24 cases representing all cancer types for each group of 10,000 citizens. The study indicated an almost two times higher probability of cancer development among rural workers, with a calculated relative risk between those exposed (agriculture workers) and the non-exposed (other occupations) of 1.6. No patterns of geographical distribution of cancer in that time period were recorded among rural workers of Bariri. However, the higher number of positive occurrences in the southwestern outskirts of the city indicated an area that must be prioritized in distributing environmental health information and conducting preventive education campaigns.
MeSH term(s)	Adult ; Aged ; Brazil/epidemiology ; Female ; Humans ; Male ; Middle Aged ; Neoplasms/epidemiology ; Neoplasms/etiology ; Occupational Exposure ; Pesticides/poisoning ; Public Health ; Risk Factors ; Rural Population
Chemical Substances	Pesticides
Language	English
Publishing date	2005-07
Publishing country	Netherlands
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	554791-x
ISSN	1873-6750 ; 0160-4120
ISSN (online)	1873-6750
ISSN	0160-4120
DOI	10.1016/j.envint.2005.02.002
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Article: On the interaction mechanisms of atrazine and hydroxyatrazine with humic substances.

Martin-Neto, L / Traghetta, D G / Vaz, C M / Crestana, S / Sposito, G

Journal of environmental quality

2001 Volume 30, Issue 2, Page(s) 520–525

Abstract: Atrazine (6-chloro-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine) is retained against leaching losses in soils principally by sorption to organic matter, but the mechanism of sorption has been a matter of controversy. Conflicting evidence exists for ... ...

Abstract	Atrazine (6-chloro-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine) is retained against leaching losses in soils principally by sorption to organic matter, but the mechanism of sorption has been a matter of controversy. Conflicting evidence exists for proton transfer, electron transfer, and hydrophobic interactions between atrazine and soil humus, but no data are conclusive. In this paper we add to the database by investigating the role of (i) hydroxyatrazine (6-hydroxy-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine) and (ii) hydrophobicity in the sorption of atrazine by Brazilian soil humic substances. We demonstrate, apparently for the first time, that hydroxyatrazine readily forms electron-transfer complexes with humic substances. These complexes probably are the cause of the well-known strong adsorption by humic acids and they may be the undetected cause of apparent electron-transfer complexes between soil organic matter and atrazine, whose transformation to the hydroxy form is facile. We also present evidence that supports the important contribution of hydrophobic interactions to the pH-dependent sorption of atrazine by humic substances.
MeSH term(s)	Adsorption ; Atrazine/analogs & derivatives ; Atrazine/chemistry ; Electrons ; Herbicides/chemistry ; Humic Substances/chemistry ; Hydrogen-Ion Concentration ; Soil Pollutants/analysis
Chemical Substances	Herbicides ; Humic Substances ; Soil Pollutants ; Atrazine (QJA9M5H4IM)
Language	English
Publishing date	2001-03
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	120525-0
ISSN	1537-2537 ; 0047-2425
ISSN (online)	1537-2537
ISSN	0047-2425
DOI	10.2134/jeq2001.302520x
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