Deterioração físico-conservacionista da sub - bacia hidrográfica do Rio Ibicuí-Mirim - RS

Sampaio, Marcela Vilar; Santos, Michele da Silva; Rocha, José Sales Mariano da; Paula, Mateus Dantas de; Mendes, Angelise Vieira

doi:10.1590/s1413-70542010000200005

Cited by 7 publications

(4 citation statements)

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“…The Ibicuí-Mirim River (IMR) and the Tororaipí River (TRR) belong to the Ibicuí River basin (drainage area of 47,740 km 2 ; Paiva et al 2000 ). The IMR is 5 th order, drains an area of 33.1 km 2 ( Sampaio et al 2010 ), and is also located in Santa Maria Municipality, but far from the urban area. The TRR is 4 th order, has a drainage area of 0.15 km 2 , and is located in Mata Municipality, which has ca.…”

Section: Methodsmentioning

confidence: 99%

The influence of natural and anthropic environmental variables on the structure and spatial distribution along longitudinal gradient of macroinvertebrate communities in southern Brazilian streams

Salvarrey

Kotzian

Spies

et al. 2014

Journal of Insect Science

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Southern Brazilian rivers and streams have been intensively affected by human activities, especially agriculture and the release of untreated domestic sewage. However, data about the aquatic macroinvertebrates in these streams are scarce and limited to only certain groups. In addition, studies focusing on the structure and spatial distribution of these communities are lacking. This study analyzed the effects of natural and anthropic variables on the community structure of macroinvertebrates along a longitudinal gradient in three microbasins located in a region of landscape transition in the state of Rio Grande do Sul, Brazil. Sampling was conducted in the Vacacaí-Mirim River (August 2008) and in the Ibicuí-Mirim and Tororaipí rivers (August 2009) following an environmental gradient including 1 st , 2 nd , 3 rd , and 4 th order segments. Local natural factors that were analyzed include water temperature, pH, electrical conductivity, dissolved oxygen, substrate granulometry, and the presence of aquatic vegetation. Anthropic variables that were analyzed include including bank erosion, land use, urbanization, riparian deforestation, and fine sediments input. A total of 42 families and 129 taxa were found, with predominance of environmentally tolerant taxa. Geological context (landscape transition and large hydrographic basins) tended to influence natural environmental factors along the rivers’ longitudinal gradients. However, changes in anthropic variables were not affected by these geological differences and therefore did not correlate with patterns of spatial distribution in macroinvertebrate communities. Only 1 st order stream segments showed a community composition with high richness of taxa intolerant to anthropic disturbance. Richness as a whole tended to be higher in 3 rd to 4 th order set of segments, but this trend was a result of local anthropic environmental disturbances. Future inventories conducted in similar landscape transition regions of Brazil, for conservation purposes, must consider stream segments of different orders, microbasins, and major basins in order to obtain data that faithfully reflect the regional diversity. Additionally, it is necessary to consider environmental gradients of land use and anthropic impacts in order to suggest appropriate strategies for conserving the environmental integrity of streams.

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Section: Methodsmentioning

confidence: 99%

The influence of natural and anthropic environmental variables on the structure and spatial distribution along longitudinal gradient of macroinvertebrate communities in southern Brazilian streams

Salvarrey

Kotzian

Spies

et al. 2014

Journal of Insect Science

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“…O Diagnóstico Físico Conservacionista (DFC) de bacias hidrográficas é uma das metodologias existentes para diagnosticar os impactos ambientais negativos e ajudar no planejamento ambiental em bacias hidrográficas (Chueh e Santos, 2005;Sampaio et al, 2010) Para Beltrame (1994) o DFC busca diagnosticar áreas vulneráveis à degradação ambiental em BH's utilizando ferramentas de mapeamento e parâmetros descritivos. A BH é a unidade de planejamento que melhor se encaixa com os propósitos da metodologia do diagnóstico físico conservacionista.…”

Section: Issn:1984-2295unclassified

Diagnóstico Físico Conservacionista (DFC) como metodologia para a quantificação da degradação ambiental na bacia hidrográfica do Rio Judia - Acre

Nascimento¹,

Santos

Silva³

et al. 2021

Rev. Bras. Geog. Fis.

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A degradação ambiental de uma bacia hidrográfica pode ser resultado de uma série de ações geradas pela atividade antrópica, podendo ser analisadas de forma sistêmica através do diagnóstico físico conservacionista, para diagnosticar os impactos ambientais negativos e ajudar no planejamento ambiental das bacias hidrográficas. Neste trabalho foi aplicada a metodologia do Diagnóstico físico conservacionista (DFC) na bacia hidrográfica do Rio Judia, localizada em Rio Branco – Acre. Para isso, os parâmetros foram adaptados para a realidade local, sendo aplicados por meio de técnicas de geoprocessamento, a fim de identificar e quantificar o grau de degradação da bacia hidrográfica entre os anos de 2006 à 2019. Os resultados apontaram que, o médio curso obteve o maior grau de degradação, 23. O baixo curso obteve valor 22 e o auto curso valor 21. Todos os três cursos da bacia hidrográfica tiveram valores elevados de degradação, indicando que recursos naturais como solo, floresta e água encontram-se ameaçados por atividades antrópicas como: pecuária, uso indiscriminado da água e ocupações irregulares. Conclui-se que a metodologia do DFC possibilitou a correta identificação quanto ao grau de degradação da bacia do Rio Judia, apontando os parâmetros que mais contribuíram para o atual cenário ambiental. Physical Conservationist Diagnosis (PCD) as a methodology for quantifying environmental degradation in the Rio Judia river basin - Acre A B S T R A C TThe environmental degradation of a hydrographic basin can be the result of a series of actions generated by anthropic activity, which can be analyzed in a systemic way through the physical conservationist diagnosis, to diagnose the negative environmental impacts and help in the environmental planning of the hydrographic basins. In this work, the methodology of physical conservationist diagnosis (PCD) was applied in the Judia River basin, located in Rio Branco - Acre. For this, the parameters were adapted to the local reality, being applied through geoprocessing techniques, in order to identify and quantify the degree of degradation of the watershed between 2006 and 2019. The results showed that the mean course obtained the highest degree of degradation, 23. The low course obtained value 22 and the auto course value 21. All three courses of the watershed had high degradation values, indicating that natural resources such as soil, forest and water are threatened by anthropic activities such as livestock, indiscriminate use of water and irregular occupations. It was concluded that the PCD methodology allowed the correct identification of the degree of degradation of the Judia River basin, pointing out the parameters that most contributed to the current environmental scenario.Keywords: degree and degradation, environment, hydrographic Basin

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“…The Ruggedness Number indicates the reality of sub-basin watersheds and offers a simple, quick contribution and precise planning, for better and more just economic exploitation, according to land aptitude. Soil capability in river basins and the Ruggedness Number are equivalent in over 95% of cases [13,14]. The higher the RN value, the greater the danger of erosion and environmental degradation [15].…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have demonstrated the efficiency of the RN method for determining soil capability in Brazilian watersheds [1][2][3][4][5][6][7][13][14][15] and other watersheds around the world [16][17][18][19]. However, the absence of potential land use or agricultural land suitability assessments is recurrent in territorial management plans and integrated water resources plans (IWRP).…”

Section: Introductionmentioning

confidence: 99%

Environmental Land Use Conflicts in a Macroscale River Basin: A Preliminary Study Based on the Ruggedness Number

Guidolini

Ometto

Arcoverde

et al. 2020

Water

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Inadequate land use planning is one of the main driving forces leading to the occurrence of erosion and environmental degradation. The negative impacts of poor planning influence soil physical quality and fertility, agricultural productivity, water quality and availability, biodiversity and other ecosystem services. In some areas, actual land use is not consistent with potential use. When this occurs, the area is termed as being in environmental land use conflict. Many studies have demonstrated the efficiency of the ruggedness number (RN) method for determining land use potential in watersheds. The RN method is simple and can be carried out using geographic information systems (GIS). However, the absence of potential land use or agricultural land suitability assessments is recurrent in territorial management plans or integrated water resources plans (IWRP), especially for macroscale river basins. Therefore, the aim of this preliminary study is to identify possible environmental land use conflicts at the Rio Grande Basin (BHRG), Brazil, using the Ruggedness Number. The results indicate high agricultural use potential and the predominance of appropriate or acceptable soil use at the BHRG. However, class 1, 2 and 3 environmental conflicts were identified in some Rio Grande sub-basins, suggesting greater environmental degradation risks. The findings clearly indicate that more exhaustive studies on environmental quality (soil capability, water, biodiversity) are required at the BHRG, especially in environmental land use conflict areas. We emphasize that this is an important preliminary study which may be carried out in any other macroscale hydrographic basin.

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Deterioração físico-conservacionista da sub - bacia hidrográfica do Rio Ibicuí-Mirim - RS

Cited by 7 publications

References 0 publications

The influence of natural and anthropic environmental variables on the structure and spatial distribution along longitudinal gradient of macroinvertebrate communities in southern Brazilian streams

The influence of natural and anthropic environmental variables on the structure and spatial distribution along longitudinal gradient of macroinvertebrate communities in southern Brazilian streams

Diagnóstico Físico Conservacionista (DFC) como metodologia para a quantificação da degradação ambiental na bacia hidrográfica do Rio Judia - Acre

Environmental Land Use Conflicts in a Macroscale River Basin: A Preliminary Study Based on the Ruggedness Number

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