Geodiversity assessment of the Xingu drainage basin

Silva, Juliana de Paula; Pereira, D. I.; Aguiar, Alexandre M.; Rodrigues, Cleide

doi:10.1080/17445647.2013.775085

Cited by 60 publications

(39 citation statements)

References 4 publications

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“…Geodiversity encompasses the natural range of physical components of ecosystems, including geological, geomorphological, and pedological (Silva et al, 2013). So far, geodiversity has been mostly studied on large spatial scales, ranging between hillslopes, watersheds, and landforms (Serrano-Cañadas and Ruiz-Flaño, 2007;Jačková and Romportl, 2008;Thomas, 2012).…”

Section: Introductionmentioning

confidence: 99%

Geodiversity decreases shrub mortality and increases ecosystem tolerance to droughts and climate change

Stavi

Rachmilevitch

Hjazin

et al. 2018

Earth Surf Processes Landf

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Mass mortality of shrubs, especially the Noaea mucronata species, has been observed in the semi‐arid Negev of Israel since the early twenty‐first century. This has followed a long‐term drought episode, and suggests a hysteresis‐like effect. However, recent studies have revealed that the mortality has been varied across the region. Therefore, we assessed the depth and stoniness of the soil profile, in homogeneous and heterogeneous hillslopes. Then, we studied the volumetric moisture content during two consecutive growing seasons, in the topsoil of shrubby patches and of inter‐shrub spaces in these hillslopes. The study shows that geodiversity – characterized by shallow soil, a high content of stones in the soil, and a high cover of rock fragment on the surface – reduced shrub mortality. This was attributed to the soil moisture content, which was considerably greater in the heterogeneous hillslopes, than that in the homogeneous hillslopes. It is proposed that the shallow soil halted the growth of herbaceous vegetation in the inter‐shrub spaces of the heterogeneous hillslopes. Therefore, under rainstorms, this hillslope configuration results in considerable generation of overland water flow in the inter‐shrub spaces. The water accumulates in the shrubby patches, allowing them to thrive, even during long‐term dry episodes. In hillslopes with a deep soil layer, no stoniness in the soil profile, and no cover of rock fragments, the herbaceous vegetation is well developed, covering a considerable share of the inter‐shrub spaces. This negates runoff formation and source–sink relations, limiting water availability for the shrubs, and resulting in their mass mortality. Despite no direct pastoral value for livestock, the shrubs play an important role in overall ecosystem functioning. This is due to their capacity to transect hydraulic connectivity, and negate ecosystem collapse. We propose a conceptual model for demonstrating the role played by geodiversity in alleviating drought stress in drylands. Copyright © 2018 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Geodiversity decreases shrub mortality and increases ecosystem tolerance to droughts and climate change

Stavi

Rachmilevitch

Hjazin

et al. 2018

Earth Surf Processes Landf

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“…The authors concluded that mountains with steep cliffs are more geodiverse areas, exactly where tracks to geotourism are. Silva et al (2013) used a method to quantify geodiversity from river system indicators. Pereira et al (2013) used a method that overrides different abiotic elements across the territory to find indexes of geodiversity throughout Paraná state, Brazil.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Geodiversity from Landscape Units of the Cadeado Range Region in Paraná, Brazil

Manosso

Nóbrega

2015

Geoheritage

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This work aims to carry out a quantitative evaluation of geodiversity in a unit of Cadeado Range, Paraná state, Brazil, on the eastern edge of the Paraná sedimentary basin. We identified and defined eight compartments or landscape units using an integrated analysis of the set of elements of their geoecological structure: geomorphological, geological, pedological, hydrologic, and socioeconomic features. We made a quantitative evaluation of the abiotic elements of the landscape, aiming to understand the spatial distribution of geodiversity. To this, we applied the calculation of geodiversity index proposed by Serrano and Ruiz-flaño ((62): [1][2][3][4][5][6][7][8] 2007), in order to determine the geodiversity richness index for each compartment, as well as the distribution or relative frequency of the elements. It was possible to demonstrate that compartments with a wider territorial area do not necessarily hold a greater richness index and that compartments with greater richness area do not necessarily shelter a better equability or relative frequency among elements. Therefore, areas with a higher geodiversity index are associated with a balance between element distribution in a given area and its richness. We believe that this method can inform future studies to compare rates of geodiversity and biodiversity in the territory with a nature conservation aim.

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“…Pretende-se que constitua uma boa ferramenta na gestão territorial, em especial na tomada de decisões de conservação da natureza, na medida em que são delimitadas áreas com características diferentes que podem estar associadas a importantes valores naturais. O interesse recente no mapeamento da geodiversidade também acentuou a vantagem do uso de informação geomorfológica por unidades homogéneas, método que permitiu a elaboração dos mapas de geodiversidade do Estado do Paraná (Pereira et al, 2013a) e da Bacia do Xingu (Silva et al, 2013). O mapa aqui apresentado foi usado na determinação da diversidade geomorfológica que integra o mapa de geodiversidade de Portugal Continental (Pereira et al 2013b).…”

Section: Introductionunclassified

Unidades Geomorfológicas De Portugal Continental

Pereira

Santos

et al. 2014

Rev. Bras. Geomorfol.

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Resumo:São representadas cartografi camente as unidades geomorfológicas identifi cadas para os 89015 km2 do território de Portugal Continental. A delimitação das unidades teve por base a análise dos padrões da textura fornecida por imagens SRTM, com revisão e adaptação posterior à altimetria e à geologia, para os quais foram usadas bases cartográfi cas digitais. Foram considerados três níveis taxionómicos que permitem descrever e caracterizar áreas homogéneas do ponto de vista geomorfológico. As três unidades de 1º nível baseiam-se nas unidades morfostruturais clássicas consideradas para a Península Ibérica. As dez unidades de 2º nível constituem, na sua maioria, divisões clássicas do relevo de Portugal Continental, agora agrupadas de acordo com a metodologia adoptada e designadas como unidades morfosculturais. As 56 unidades de 3º nível, ou subunidades morfosculturais, foram individualizadas com base nos padrões de relevo identifi cados nas imagens SRTM e na observação de campo e adquiriram uma designação baseada essencialmente nas geoformas que as individualizam e na toponímia local. As unidades geomorfológicas identifi cadas são descritas Informações sobre o Artigo

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Geodiversity assessment of the Xingu drainage basin

Cited by 60 publications

References 4 publications

Geodiversity decreases shrub mortality and increases ecosystem tolerance to droughts and climate change

Geodiversity decreases shrub mortality and increases ecosystem tolerance to droughts and climate change

Calculation of Geodiversity from Landscape Units of the Cadeado Range Region in Paraná, Brazil

Unidades Geomorfológicas De Portugal Continental

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