Multi-scale characterization of soil variability within an agricultural landscape mosaic system in southern Cameroon

Yemefack, Martin; Rossiter, David G.; Njomgang, R.

doi:10.1016/j.geoderma.2004.07.007

Cited by 107 publications

(66 citation statements)

References 35 publications

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“…Therefore, cluster analysis allowed the successful identification and separation of the two harvesting systems; in fact, the target properties were similar for the soils harvested with each method but differed from those of the soils harvested with other (Webster & Oliver, 2009). This confirms that multivariate statistical analysis allows minimal variability within a group and maximal variability with another to be detected (Yemefack et al, 2005).…”

Section: Resultssupporting

confidence: 79%

Iron oxides and quality of organic matter in sugarcane harvesting systems

Barbieri¹,

Júnior

Siqueira³

et al. 2014

Rev. Bras. Ciênc. Solo

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Improvements in working conditions, sustainable production, and competitiveness have led to substantial changes in sugarcane harvesting systems. Such changes have altered a number of soil properties, including iron oxides and organic matter, as well as some chemical properties, such as the maximum P adsorption capacity of the soil. The aim of this study was to characterize the relationship between iron oxides and the quality of organic matter in sugarcane harvesting systems. For that purpose, two 1 ha plots in mechanically and manually harvested fields were used to obtain soil samples from the 0.00-0.25 m soil layer at 126 different points. The mineralogical, chemical, and physical results were subjected to descriptive statistical analyses, such as the mean comparison test, as well as to multivariate statistical and principal component analyses. Multivariate tests allowed soil properties to be classified in two different groups according to the harvesting method: manual harvest with the burning of residual cane, and mechanical harvest without burning. The mechanical harvesting system was found to enhance pedoenvironmental conditions, leading to changes in the crystallinity of iron oxides, an increase in the humification of organic matter, and a relative decrease in phosphorus adsorption in this area compared to the manual harvesting system.

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Section: Resultssupporting

confidence: 79%

Iron oxides and quality of organic matter in sugarcane harvesting systems

Barbieri¹,

Júnior

Siqueira³

et al. 2014

Rev. Bras. Ciênc. Solo

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“…The other attributes presented mean variability, where the highest value of the Cv of the P outstands. This variability observed in the attributes has been reported by different authors (Silva and Chaves, 2001;Yemefack et al, 2005;Camacho-Tamayo et al, 2008), who also emphasized the behavior of P, element that is distributed superficially or incorporated in the first centimeters of soil.…”

Section: Resultssupporting

confidence: 75%

“…The fit for normality for these attributes, in different soil types, is reported by various authors (Silva et al, 2001;Yemefack et al, 2005;Camacho-Tamayo et al, 2008).…”

Section: Resultsmentioning

confidence: 98%

Spatial variability of an Alfisol cultivated with sugarcane

et al. 2011

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Soil variability occurs due to natural and anthropogenic factors acting at various spatial and temporal scales. The purpose of this study was to evaluate the spatial variability as well as the relation of some chemical attributes using different statistical techniques. The study was conducted in the municipality of Maracanaú (CE, Brazil) in the commercial area of sugar cane in a typic Hapludalf. Soils were sampled in a 100 x 100 m grid every 10 m and at a depth between 0 and 20 cm for determination of exchangeable acidity, pH (KCl), Ca, Na, K, Mg, P, N, sum of bases, cationic exchange capacity, base saturation and organic matter. Data were subjected to analysis of descriptive statistics, multivariate analysis and geostatistics. Attributes showed low and medium variability, except for pH that did not show spatial dependence. Different statistical tools helped to identify the soil spatial variability and to get a better understanding of relationships among different attributes. Techniques also allowed to better plan and control agricultural production, especially in carrying out site specific management of agricultural inputs.

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“…O G1, englobando os dados localizados no topo baixo, sopé de transporte e encosta da paisagem, enquanto que o G2 agrupando os dados a posição de topo alto, evidenciando assim, que os segmentos de vertente topo baixo, encosta e sopé de transporte apresentaram semelhanças em seus atributos diferindo do topo alto. Esta informação corrobora com a afirmativa de Yemefack et al (2005) que esta técnica permite agrupar variáveis com características semelhantes e com aumento de variabilidade entre os agrupamentos formados. Para Cunha et al (2005) os resultados acima ainda podem ser explicados pelo fato de um grupo de solos (G1) ocuparem as posições mais instáveis da paisagem e por serem horizontes superficiais o que permite este resultado.…”

Section: Resultsunclassified

“…Assim, o uso de técnicas multivariadas permitiu que fenômenos dependentes de múltiplas variáveis pudessem ser analisados, favorecendo assim um entendimento maior do complexo, já que não basta conhecer as variáveis isoladas, mas conhecê-las na sua totalidade, pois as informações são fornecidas pelo conjunto e não individualmente (GROBE, 2005). Por outro lado, a utilização do sistema de classificação numérica e hierárquica revela os vários níveis da similaridade e permite visualizar um número variável de agrupamentos; com isso a variabilidade é minimizada dentro de um grupo e maximizada entre os grupos, a fim de produzir grupos relativamente similares (YEMEFACK et al, 2005 …”

Section: Introductionunclassified

Segmentos de vertente e atributos do solo de uma toposseqüência na região de Manicoré, AM

Campos¹,

Ribeiro²,

Júnior³

et al. 2010

Rev. Ciênc. Agron.

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Resumo -As variações dos atributos do solo ocorrem em função de vários fatores tais como: clima, material de origem, vegetação e, especialmente do relevo, que regula o escoamento superficial e a drenagem, e tem influência no tempo de exposição dos materiais à ação do intemperismo. O objetivo deste trabalho foi estudar a influência dos diferentes segmentos de vertente nos atributos do solo em uma toposseqüência na região de Manicoré, AM. Foi estabelecido um caminhamento de 3.000 m a partir do "espigão" da vertente no sentido do caimento mais suave do relevo e os segmentos da vertente foram determinados com base na "quebra" de declive do terreno. Foram coletadas 20 amostras nos diferentes segmentos de vertentes identificados: topo alto: 0,0-0,19 e 0,37-0,60 m; meia encosta: 0,0-0,28 e 0,60-0,80 m; sopé de transporte: 0,0-0,15 e 0,42-0,71 m e topo baixo: 0,0-0,15 e 0,20-0,40 m. O critério de escolha das profundidades foi à coincidência com os horizontes diagnósticos superficiais e subsuperficiais determinados na descrição morfológica dos perfis. Foram realizadas análises físicas de textura, densidades do solo e das partículas, porosidade total e condutividade hidráulica, Nas análises químicas foram determinados pH, em água e em KCl, Ca, Mg, K, e Al trocáveis, P disponível, H+Al e C orgânico. Com o uso das técnicas estatísticas multivariadas foi possível distinguir diferentes ambientes geomórficos independentes dos segmentos de vertente identificados. As variações do relevo favoreceram a presença de solos distróficos no topo alto e solos eutróficos no sopé de transporte. Palavras-chave -Formas do relevo. Manicoré. Pedogênese.Abstract -Variations of soil properties are consequence of several factors such as: climate, parent material, vegetation and, particularly relief, which controls runoff and drainage, and has influence in the exposure of parent materials to the weathering action. The objective of this work was to study the influence of the slope segments on soil attributes of a topossenquence in the Manicoré region, AM. Twenty samples were collected in each of the several slope segments identified along a 3 km transect, from the top and toward the lower part of the topography. The slope segments and the sampling depths were: high top (0.0-0.19 and 0.37-0.60 m), medium slope (0.0-0.28 and 0.60-0.80 m); lower slope (0.0-0.15 and 0.42-0.71 m) and low top (0.0-0.15 and 0.20-0.40 m). The sampling depths were coincident with the surface and subsurface diagnostic horizons defined in the profile morphological description. Physical analysis involved particle size distribution, soil and particle density, total porosity and saturated hydraulic conductivity. In the chemical analysis pH in water and KCl, exchangeable cations, exchangeable Al, available P, H+Al, organic carbon were determined. The use of multivariate statistic techniques enabled the distinction of different soil geomorphic environments independent of the slope segments identifications. The relief variations contributed to the presence of dystrophic soils in th...

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Multi-scale characterization of soil variability within an agricultural landscape mosaic system in southern Cameroon

Cited by 107 publications

References 35 publications

Iron oxides and quality of organic matter in sugarcane harvesting systems

Iron oxides and quality of organic matter in sugarcane harvesting systems

Spatial variability of an Alfisol cultivated with sugarcane

Segmentos de vertente e atributos do solo de uma toposseqüência na região de Manicoré, AM

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