Archetypes of catenas in respect to matter — a concept for structuring and grouping catenas

Sommer, Michael; Schlichting, E.

doi:10.1016/s0016-7061(96)00095-x

Cited by 110 publications

(56 citation statements)

References 146 publications

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“…Mapas de krigagem do teor de argila (g kg -1 ), areia (g kg -1 ), pH, conteúdo de matéria orgânica -MO (g kg -1 ), acidez potencial (mmol C dm -3 ), soma de bases (mmol C dm -3 ), capacidade de troca catiônica -CTC (mmol C dm -3 ) e saturação por bases -V (%) na profundidade de 0-0,25 m A distribuição das variáveis químicas foi semelhante às variáveis texturais (Figura 3) e os teores de pH, MO, SB e CTC acompanharam o padrão de distribuição da fração argila do solo, com valores mais expressivos nas partes mais baixas do terreno onde o relevo é mais movimentado, função principalmente do material de origem, basáltico, reforçado pelo comportamento do relevo, que influencia sobretudo no movimento anisotrópico da água (vertical e horizontal) (Sommer & Schlichting, 1997;Anjos et al, 1998). A acidez potencial expressa pelo (H + + Al +3 ) e a saturação por bases (V%) apresentam os teores mais elevados nos locais em que se encontram os maiores teores de argila e matéria orgâni-ca, em função do balanço de carga.…”

Section: Resultsunclassified

Planejamento agrícola e implantação de sistema de cultivo de cana-de-açúcar com auxílio de técnicas geoestatísticas

Campos

Júnior

Pereira

et al. 2009

Rev. bras. eng. agríc. ambient.

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RESUMOA posição de importância ocupada pela cana-de-açúcar (Saccharum officinarum) no agronegócio brasileiro justifica o uso de técnicas que propiciem a implantação de um sistema avançado de cultivo, a partir do conhecimento da variabilidade espacial dos atributos do solo. O objetivo deste trabalho foi realizar o planejamento agrícola e a implantação de um sistema de cultivo da gramínea, com o auxílio de técnicas geoestatísticas, na região de Pereira Barreto, SP. Para o mapeamento de uma área de 505 ha utilizando-se equipamento de sistema de posicionamento global (GPS) elaborou-se, em seguida, o Modelo Digital de Elevação (MDE); depois coletaram-se amostras de solo na profundidade de 0-0,25 m, a cada 7 ha, para caracterização química e granulométrica. Os atributos físicos e químicos do solo foram analisados por meio de estatística descritiva e geoestatística. A distribuição espacial dos atributos granulométricos e químicos do solo permitiu alocação das variedades em estudo de acordo com a fertilidade do solo e teor de argila. O mapa de krigagem dos atributos granulomé-tricos e químicos do solo forneceu informações para o estabelecimento dos ambientes de produção, com manejo do solo e de culturas diferenciado. O uso de técnicas geoestatísticas aplicadas na análise dos atributos dos solos permitiu realizar com precisão o planejamento do cultivo de cana-de-açúcar, a partir da separação de ambientes, adequação de práticas de adubação e alocação de variedades adaptadas às restrições impostas pelos atributos dos solos.Palavras-chave: atributos do solo, zonas de manejo específico, krigagem Agricultural planning and implementation of cultivation systems for sugarcane using geostatistics techniques ABSTRACT Sugarcane is one of the most important crops of the Brazilian agribusiness and this importance justifies the use of techniques that allow the implementation of cultivation systems capable of reducing the variability of soil characteristics and the establishment of efficient agricultural planning. The aim of the present work was the planning and implementation of cultivation systems for sugarcane using geostatistical techniques, in the Pereira Barreto region, SP. An area of 505 ha was mapped using the global positioning system (GPS) and a Digital Elevation Model was elaborated (MDE). Soil samples were collected for 0-0.25 m depth, in each 7 ha, for their chemical attributes and texture characterization. Data were analyzed by descriptive statistics and geostatistics. The determination of the spatial distribution of soil granulometric and chemical attributes allowed the allocation of the studied sugarcane varieties according to soil fertility and clay content. The kriging maps of soil granulometric and chemical attributes brought useful information to the establishment of production environments with different soil and crop managements. The identification of different environments by means of geostatistical techniques allowed the precise planning of the sugarcane cultivation, as well as the adequacy of fertilization prac...

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Section: Resultsunclassified

Planejamento agrícola e implantação de sistema de cultivo de cana-de-açúcar com auxílio de técnicas geoestatísticas

Campos

Júnior

Pereira

et al. 2009

Rev. bras. eng. agríc. ambient.

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“…This suggests that topographic changes taking place on smaller scales than the overall scale considered here may have important effects on the soil and litter. Geographic orientation of slopes, surface curvature (concave, convex or plain), and altitude are all known to change within small distances in areas with heterogeneous topography (Sommer and Schlichting, 1997;Gao et al, 2011). Thus, it seems likely that thoroughly evaluating these topographic features on smaller scales (e.g., scales comparable to site A or site B alone) across areas such as mountain chains is likely to enhance our comprehension of soil and litter variability in tropical regions with heterogeneous topography.…”

Section: Discussionmentioning

confidence: 99%

Contribution of Topography and Incident Solar Radiation to Variation of Soil and Plant Litter at an Area with Heterogeneous Terrain

Nettesheim

Conto

Pereira

et al. 2015

Rev. Bras. Ciênc. Solo

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Natural processes that determine soil and plant litter properties are controlled by multiple factors. However, little attention has been given to distinguishing the effects of environmental factors from the effects of spatial structure of the area on the distribution of soil and litter properties in tropical ecosystems covering heterogeneous topographies. The aim of this study was to assess patterns of soil and litter variation in a tropical area that intercepts different levels of solar radiation throughout the year since its topography has slopes predominantly facing opposing geographic directions. Soil data (pH, C, N, P, H+Al, Ca, Mg, K, Al, Na, sand, and silt) and plant litter data (N, K, Ca, P, and Mg) were gathered together with the geographic coordinates (to model the spatial structure) of 40 sampling units established at two sites composed of slopes predominantly facing northwest and southeast (20 units each). Soil and litter chemical properties varied more among slopes within similar geographic orientations than between the slopes facing opposing directions. Both the incident solar radiation and the spatial structure of the area were relevant in explaining the patterns detected in variation of soil and plant litter. Individual contributions of incident solar radiation to explain the variation in the properties evaluated suggested that this and other environmental factors may play a particularly relevant role in determining soil and plant litter distribution in tropical areas with heterogeneous topography. Furthermore, this study corroborates that the spatial structure of the area also plays an important role in the distribution of soil and litter within this type of landscape, which appears to be consistent with the action of water movement mechanisms in such areas.

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“…Soil water samples will be captured by soil solution access tubes as described by [17] installed in different depths depending on the lithological discontinuities. By investigating several soil profiles along a hillslope (upper, middle, foot slope) we will capture the spatial variability of depth-dependent geochemical compositions regarding the catena concept [18]. The application of the catena concept enables us to assess differences of subsurface flow processes near the hydrograph network and at the hillslope.…”

Section: Methodsmentioning

confidence: 99%

Short Report: Identifying Sources of Subsurface Flow—A Theoretical Framework Assessing Hydrological Implications of Lithological Discontinuities

Reiss¹,

Chifflard²

2014

OJMH

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An integrative theoretical concept-combining scientific approaches from soil science and slope hydrology-is given as a framework to study the influence of depth functions of geochemical concentrations for trace elements, dissolved organic carbon and stable isotopes in the soil pore water of stratified soils on the chemical composition of the hillslope runoff. Combining investigations at the point and hillslope scale opens the opportunity to identify sources of subsurface runoff components using geochemical depth functions as proxies.

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Archetypes of catenas in respect to matter — a concept for structuring and grouping catenas

Cited by 110 publications

References 146 publications

Planejamento agrícola e implantação de sistema de cultivo de cana-de-açúcar com auxílio de técnicas geoestatísticas

Planejamento agrícola e implantação de sistema de cultivo de cana-de-açúcar com auxílio de técnicas geoestatísticas

Contribution of Topography and Incident Solar Radiation to Variation of Soil and Plant Litter at an Area with Heterogeneous Terrain

Short Report: Identifying Sources of Subsurface Flow—A Theoretical Framework Assessing Hydrological Implications of Lithological Discontinuities

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