Land-use effects on river habitat quality and sediment granulometry along a 4th-order tropical river

Boëchat, Iola G.; Paiva, Aparecida Beatriz das Mercês de; Hille, Sandra; Gücker, Björn

doi:10.4136/ambi-agua.1232

Cited by 13 publications

(14 citation statements)

References 23 publications

(5 reference statements)

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“…Instead, the filtering capacity of the riparian vegetation seems to be high. For instance, Boëchat et al (2013) found that the intactness of the riparian zone determines habitat integrity and sediment quality more than the entire watershed's land cover.…”

Section: Discussion Of the Combined Effects Of Water And Land Degradamentioning

confidence: 99%

The Brazilian Cerrado: assessment of water and soil degradation in catchments under intensive agricultural use

et al. 2014

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The Brazilian Cerrado is recognized as one of the most threatened biomes in the world, as the region has experienced a striking change from natural Cerrado vegetation to intense cash crop production. This paper reviews the history of land conversion in the Cerrado and the development of soil properties and water resources under past and ongoing land use. We compared soil and water quality parameters from different land uses considering 80 soil and 18 water studies conducted in different regions across the Cerrado to provide quantitative evidence of soil and water alterations from land use change. Following the conversion of native Cerrado, significant effects on soil pH, bulk density and available P and K for croplands and less-pronounced effects on pastures were evident. Soil total N did not differ between land uses because most of the sites classified as croplands were nitrogen-fixing soybeans, which are not artificially fertilized with N. In contrast, water quality studies showed nitrogen enrichment in agricultural catchments, indicating fertilizer impacts and potential susceptibility to eutrophication. Regardless of the land use, P is widely absent because of the high-fixing capacities of deeply weathered soils and the filtering capacity of riparian vegetation. Pesticides, however, were consistently detected throughout the entire aquatic system. In several case studies, extremely high-peak concentrations exceeded Brazilian and European Union (EU) water quality limits, which were potentially accompanied by serious health implications. Land use intensification is likely to continue, particularly in regions where less annual rainfall and severe droughts are projected in the northeastern and western Cerrado. Thus, the leaching risk and displacement of agrochemicals are expected to increase, particularly because the current legislation has caused a reduction in riparian vegetation. We conclude that land use intensification is likely to seriously limit the Cerrado's future regarding both agricultural productivity and ecosystem stability. Because only limited data are available, we recommend further field studies to understand the interaction between terrestrial and aquatic systems. This study may serve as a valuable database for integrated modelling to investigate the impact of land use and climate change on soil and water resources and to test and develop mitigation measures for the Cerrado.

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Section: Discussion Of the Combined Effects Of Water And Land Degradamentioning

confidence: 99%

The Brazilian Cerrado: assessment of water and soil degradation in catchments under intensive agricultural use

et al. 2014

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“…Riparian buffer strips and their structure are critical for maintaining water functions and minimising eutrophication (Boëchat et al, 2013;Parron et al, 2010;). However, Allan (2004) observed that even modest catchment transformations of 3% result in higher nutrient and sediment loads.…”

Section: Water Quality Pattern Across the Catchmentmentioning

confidence: 99%

Soil changes under different land-uses in the Cerrado of Mato Grosso, Brazil

et al. 2015

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“…Dentre as preferências apresentadas pelos organismos aquáticos, há maior frequência para escolha de ambientes que possuem materiais com diâmetros elevados (Boëchat et al, 2013). Na maioria das vezes, eles se encontram com uma fauna mais diversificada, quando comparados com ambientes com materiais de granulometria fina (Barbour et al, 1999;Boëchat et al, 2013;Gordon et al, 2004;Minatti-Ferreira e Beaumord, 2006;Rodrigues et al, 2010).…”

Section: Caracterização Do Leitounclassified

“…Na maioria das vezes, eles se encontram com uma fauna mais diversificada, quando comparados com ambientes com materiais de granulometria fina (Barbour et al, 1999;Boëchat et al, 2013;Gordon et al, 2004;Minatti-Ferreira e Beaumord, 2006;Rodrigues et al, 2010).…”

Section: Caracterização Do Leitounclassified

“…A estrutura do ambiente aquático está associada aos componentes do canal, como o material presente no leito (Boëchat et al, 2013;Hawkins et al, 1993); sua morfologia, representada pelas características do leito, como a profundidade, a largura e a forma do canal; e o estudo de parâmetros hidráulicos, que possuem grande importância na descrição de ambientes (Jowett, 1993).…”

Section: Introductionunclassified

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Caracterização de ambientes aquáticos no rio de Ondas, cerrado baiano

Castro¹,

Moreira²,

Carvalho³

et al. 2015

Rev. ambiente água

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This work sought to characterize the types of environments present in the De Ondas River, with the aim of obtaining information on their structural complexity and supporting public policies for water resource management that will allow the shared water use and will protect the biodiversity of the river basin. The De Ondas River watershed is located in the Cerrado Region, in the western part of Bahia State, and covers an area of 5.559 km². In order to perform the characterization, two stretches were demarcated, one in the upper part of the basin and another in the lower. Afterwards, a topobathymetric survey was conducted, and characterizations of the bottom and of hydraulic properties were done for both the rainy and dry seasons. The topobathymetric survey in the upper course showed altitudes ranging from 699.82 m to 714.06, whereas in the lower course these varied from 439.45 m to 446.91 m. Bathymetric profiles allowed the visualization of the structure and distribution of the bottom of the channel environments. The granulometric analysis of the higher part of the basin showed that sand was predominant (88.94%), while in the lower part boulders (76.9%) and cobble (23.1%) predominated. In the higher part of the basin, the water flow varied from 5.20 m³s -1 (dry period) to 9.07 m³s -1 (rainy period); and in the lower part, from 25.73 m³s -1(dry period) to 66.44 m³s -1 (rainy period). The complexity of the environments of these stretches favors biological diversity in the river, resulting in different environments that aid aquatic species in adapting to the channel structure. The study of the physical characteristics of the De Ondas River produced a great amount of information regarding the microenvironments of the stretches examined, and will support studies related to aquatic biota and water resource management.

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Land-use effects on river habitat quality and sediment granulometry along a 4th-order tropical river

Cited by 13 publications

References 23 publications

The Brazilian Cerrado: assessment of water and soil degradation in catchments under intensive agricultural use

The Brazilian Cerrado: assessment of water and soil degradation in catchments under intensive agricultural use

Soil changes under different land-uses in the Cerrado of Mato Grosso, Brazil

Caracterização de ambientes aquáticos no rio de Ondas, cerrado baiano

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