The role of environmental land use conflicts in soil fertility: A study on the Uberaba River basin, Brazil

Valera, Carlos Alberto; Valle, Renato Farias do; Varandas, Simone; Fernandes, Luís Filipe Sanches; Pacheco, Fernando António Leal

doi:10.1016/j.scitotenv.2016.04.046

Cited by 95 publications

(61 citation statements)

References 36 publications

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“…La brusca desaparición de la vegetación ocasiona una mayor incidencia de las alternativas climáticas, dejando el suelo sometido a los efectos de la lluvia, cuyo impacto directo provoca la destrucción de los agregados y su arrastre por la escorrentía superficial, lo que aumenta el riesgo potencial de erosión. En las regiones tropicales la conversión extensiva de bosques a pasturas y la intensificación agrícola son típicamente identificadas como los conductores más importantes de cambio en el uso del suelo, con consecuente pérdida de su fertilidad, calidad y biodiversidad (Valera et al, 2016;Guillaume et al, 2016;Vallejo-Quintero, 2013). Para la Amazonía ecuatoriana se ha señalado que dependiendo del tipo de reemplazo del bosque el daño ocasionado por la deforestación sobre el suelo puede variar, por ejemplo si se convierte a áreas con especies arbóreas como café, cacao o caucho en arreglo agroforestal el daño ocasionado al suelo es mínimo, ya que representan los manejos más análogo al uso potencial de esta región (Nieto y Caicedo, 2012 Bravo et al, 2015).…”

Section: Análisis De Componentes Principales Categóricos Con Escalamiunclassified

Indicadores morfológicos y estructurales de calidad y potencial de erosión del suelo bajo diferentes usos de la tierra en la Amazonía Ecuatoriana

Bravo

Torres

Alemán

et al. 2017

An. Geogr. Univ. Complut.

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Section: Análisis De Componentes Principales Categóricos Con Escalamiunclassified

Indicadores morfológicos y estructurales de calidad y potencial de erosión del suelo bajo diferentes usos de la tierra en la Amazonía Ecuatoriana

Bravo

Torres

Alemán

et al. 2017

An. Geogr. Univ. Complut.

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“…Soil erosion is further aggravated by environmental land-use conflicts (ELUCs), as recently recognized by Pacheco et al (2014) and Valle et al (2014). ELUCs in developing countries have been reported to cause a decline in soil fertility (Valera et al, 2016). Soil erosion rates beyond the tolerable limits cause changes in the hydrological, biological and geomorphic processes and geochemical cycles, which reduces services that the soil offers to the human beings (Berendse et al, 2015;Brevik et al, 2015;Decock et al, 2015;Smith et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Estimating soil erosion risk and evaluating erosion control measures for soil conservation planning at Koga watershed in the highlands of Ethiopia

Molla¹,

Sisheber²

2017

Solid Earth

139

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Abstract. Soil erosion is one of the major factors affecting sustainability of agricultural production in Ethiopia. The objective of this paper is to estimate soil erosion using the universal soil loss equation (RUSLE) model and to evaluate soil conservation practices in a data-scarce watershed region. For this purpose, soil data, rainfall, erosion control practices, satellite images and topographic maps were collected to determine the RUSLE factors. In addition, measurements of randomly selected soil and water conservation structures were done at three sub-watersheds (Asanat, Debreyakob and Rim). This study was conducted in Koga watershed at upper part of the Blue Nile basin which is affected by high soil erosion rates. The area is characterized by undulating topography caused by intensive agricultural practices with poor soil conservation practices. The soil loss rates were determined and conservation strategies have been evaluated under different slope classes and land uses. The results showed that the watershed is affected by high soil erosion rates (on average 42 t ha −1 yr −1 ), greater than the maximum tolerable soil loss (18 t ha −1 yr −1 ). The highest soil loss (456 t ha −1 yr −1 ) estimated from the upper watershed occurred on cultivated lands of steep slopes. As a result, soil erosion is mainly aggravated by land-use conflicts and topographic factors and the rugged topographic land forms of the area. The study also demonstrated that the contribution of existing soil conservation structures to erosion control is very small due to incorrect design and poor management. About 35 % out of the existing structures can reduce soil loss significantly since they were constructed correctly. Most of the existing structures were demolished due to the sediment overload, vulnerability to livestock damage and intense rainfall. Therefore, appropriate and standardized soil and water conservation measures for different erosion-prone land uses and land forms need to be implemented in Koga watershed.

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“…The study area (19°34′07.00″S 47°57′16.41″W) was located in the Uberaba River basin, Minas Gerais State (Figure a). The site's geologic profile belongs to the Canastra Group, with conglomerates of Bauru Group and Cenozoic alluvial and colluvial deposits near the streams (Valera et al ., ). The soil type is dystrophic red and yellow–red latosols (Coutinho et al ., ; Valera et al ., ).…”

Section: Methodsmentioning

confidence: 97%

“…The riparian forest in the Paraná River basin located in Uberaba city (Minas Gerais, Brazil) and along its tributary rivers has been converted into pasture for livestock production, resulting in enhanced soil erosion because of the disruption of soil organic matter and structural functions (Valera et al ., ). Grazing activity has been reported to affect negatively the size of the total soil organic C stock (Larreguy et al ., ), resulting in the reduction of soil infiltration and acceleration of runoff and erosion (Czeglédi & Radácsi, ).…”

Section: Introductionmentioning

confidence: 97%

Riparian reforestation with a single exotic species restores soil aggregation and porosity but not humic substances

Santos

Scotti

2018

Soil Use and Management

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A degraded riparian area in the Uberaba River basin (Brazil) was restored by local landowners using a monoculture of the exotic species Syzygium cumini (L.) Skeels over 15 years. To assess this riparian restoration, we compared this experimental site (ES) with a disturbed site (DS) and a preserved site (PS) with regard to soil organic matter, humic and fulvic acids (HA and FA), glomalin, soil aggregation and porosity. The results did not show significant differences between ES and PS with regard to soil aggregation and porosity. The cation exchange capacity and the HA and FA contents of ES were significantly different from those in PS and DS. Whereas the HA content of ES was less than that in PS, FA was significantly increased. The order of aromatic composition of humic substances by site was PS > ES > DS and contrasted with the aliphatic composition, which was DS > ES > PS. A principal component analysis based on all variables demonstrated that ES was closer to PS than to DS but that there was no overlap among sites, as PS was driven by humic aromatic substances and the experimental site by fulvic and aliphatic compounds. We concluded that there was a functional recovery of ecosystem services related to soil aggregation and porosity, but the qualitative differences in organic matter formation between the restored and preserved sites were not consistent with ES being fully restored.

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The role of environmental land use conflicts in soil fertility: A study on the Uberaba River basin, Brazil

Cited by 95 publications

References 36 publications

Indicadores morfológicos y estructurales de calidad y potencial de erosión del suelo bajo diferentes usos de la tierra en la Amazonía Ecuatoriana

Indicadores morfológicos y estructurales de calidad y potencial de erosión del suelo bajo diferentes usos de la tierra en la Amazonía Ecuatoriana

Estimating soil erosion risk and evaluating erosion control measures for soil conservation planning at Koga watershed in the highlands of Ethiopia

Riparian reforestation with a single exotic species restores soil aggregation and porosity but not humic substances

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