Diferenciação espectral de solos utilizando dados obtidos em laboratório e por sensor orbital

Soils formed in high mountainous regions in southern Brazil are characterized by great accumulation of organic matter (OM) in the surface horizons and variation in the degree of development. We hypothesized that soil properties and genesis are influenced by the interaction of parent materials and climate factors, which differ depending on the location along the altitudinal gradient. The goal of this study was to characterize and classify the soil, evaluate soil distribution, and determine the interactive effects of soil-forming factors in the subtropical mountain regions in Santa Catarina state. Soil samples were collected in areas known for wine production, for a total of 38 modal profiles. Based on morphological, physical, and chemical properties, soils were evaluated for pedogenesis and classified according to the Brazilian System of Soil Classification, with equivalent classes in the World Reference Basis (WRB). The results indicated that pedogenesis was strongly influenced by the parent material, weather, and relief. In the areas where basic effusive rocks (basalt) were observed, there was formation of extensive areas of clayey soils with reddish color and higher iron oxide contents. There was a predominance of Nitossolos Vermelhos and Háplicos (Nitisols), Latossolos Vermelhos (Ferralsols), and Cambissolos Háplicos (Cambisols), highlighting the pedogenetic processes of eluviation, illuviation of clay, and latosolization in conditions of year-long, large-volume, well-distributed rainfall and stability of land forms. In areas with acid effusive rocks (rhyodacites), medial or clayey soils were observed with lower iron oxide content, invariably acidic, and with low base content. For these soils, relief promoted substantial removal of material, resulting in intense rejuvenation, with a predominance of Cambissolos Háplicos (Cambisols) and lesser occurrence of Nitossolos Brunos (Nitisols) and Neossolos Litólicos (Leptosols). Soils formed from sedimentary rocks also tended to be more acidic, but with higher sand content, and the soils identified were Cambissolos Háplicos and Húmicos (Cambisols). Cluster analysis separated the soil profiles into three groups: the first and largest was formed by profiles originating from sedimentary rocks and rhyodacites; the second, smaller group was formed by four profiles in the Água Doce region (acidic rocks); and the third was formed by profiles derived from basalt. Discriminant analysis was effective in grouping soil classes. Thus, the study highlighted the importance of geology in the formation of soils in this landscape associated with climate and relief.

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“…For Nanni et al (2004) and Fiorio et al (2010), this rate was 80 %, and Kravchenko et al (2002) had a 90 % rate.…”

Section: Rev Bras Cienc Solo 2016;40:e0150503mentioning

confidence: 95%

Genesis and Classification of Soils from Subtropical Mountain Regions of Southern Brazil

Dortzbach

Pereira

Anjos

et al. 2016

Rev. Bras. Ciênc. Solo

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“…Dentro do nível terrestre, por exemplo, 33% das publicações estiveram voltadas para estudos como a discriminação de deficiência de nitrogênio em feijoeiros (BAESSO et al, 2007), em trigo (SENA JÚNIOR et al, 2008), em algodoeiro (MOTOMYA et al, 2009) etc; enquanto que outros 33% procuraram discriminar as variações espaciais e temporais das propriedades físicas e químicas do solo. Outros trabalhos de importância na área que afirmam esses resultado foram desenvolvidos por Demattê et al (2005) e Fiorio et al (2010).…”

Section: Tabela 4 Resultado Do Cadastro Temático Indicando O Número unclassified

Use of Remote Sensing in Precision Agriculture: A Bibliometric Analysis

Ferreira

Luiz

2014

Nucleus

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RESUMO:Este estudo teve por objetivo analisar a produção científica sobre a utilização do sensoriamento remoto na agricultura de precisão, desenvolvida por autores vinculados a instituições brasileiras, com base numa ampla compilação de artigos científicos. Adotou-se como metodologia de pesquisa a análise bibliométrica e, a partir dela, relacionaram-se os resultados obtidos às dimensões espacial, temporal, institucional e temática da pesquisa brasileira nesta área. Os resultados evidenciam que, apesar de recente, o sensoriamento remoto vem contribuindo para o manejo da agricultura a sítio específico, estando à produção científica concentrada, principalmente, nas instituições das regiões Sudeste e Sul do Brasil. A maior freqüência de uso dessa geotecnologia tem ocorrido no nível terrestre, o que permite o aprimoramento e lançamento de novos sistemas sensores comerciais. Verificou-se que as diferenças nas abordagens variam em função das técnicas empregadas. Enquanto que no sensoriamento remoto terrestre o enfoque está na caracterização do comportamento espectral de solos e de plantas, no sensoriamento remoto orbital a contribuição está nas estimativas de variações espaciais e/ou temporais de áreas cultivadas e de produtividades, condições importantes para a previsão de safras agrícolas. Palavras-chave: Sensor. Manejo localizado. Análise documentária USE OF REMOTE SENSING IN PRECISION AGRICULTURE:A BIBLIOMETRIC ANALYSIS SUMMARY: This study aimed to examine the scientific literature on the use of remote sensing in precision agriculture that was developed by authors from institutions in Brazil, based on an extensive compilation of published scientific articles on the topic. It was adopted as a research methodology the bibliometric analysis, and from it, the results were related to the spatial, temporal, institutional and thematic dimensions of Brazilian research in this area. The survey results show that, although recent, remote sensing has been contributing to the management of the sitespecific farming, with the scientific production concentrated mainly in the institutions of the Southeast and South regions of Brazil. The highest frequency of geotechnology use occurs at the ground level of remote sensing, allowing the improvement and introduction of new sensor systems business. Moreover, it was found that the differences in approaches or research questions vary depending on the techniques used. While in the terrestrial remote sensing the approach is to characterize the spectral behavior of soils and plants, in orbital remote sensing, the contribution is focused on the estimation of cultivated areas and productivity, important conditions for the crops yields predicting.

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“…Therefore, studies on TOC dynamics are needed, considering different types and managements of soil; thus, techniques and methodologies have been developed for this purpose, such as soil digital mapping (MARTIN et al, 2011;WIESMEIER et al, 2014), TOC determination through spectroradiometry (FIORIO et al, 2010;GENÚ;DEMATTÊ, 2012), and adaptation of methods (MU et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Temporal Stability of Total Organic Carbon of Soils Under Different Uses in the Caatinga Biome

et al. 2019

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The objective of this work was to evaluate the temporal stability of total organic carbon (TOC) of soils under different uses in areas with Caatinga vegetation. The experiment was conducted in an experimental farm that encompasses a watershed in the Curu River Valley, in Pentecoste, state of Ceara, Brazil. Soil samples were collected in two areas with Caatinga vegetation under different uses-one with a 35-year preserved area (CP35) and one with a 30-year pasture area (CR30)-and the sampling points were distributed using a 30×30 m uniform grid. Soil samples of the 0-0.2 m layer were collected between February 2016 and April 2017 to determine TOC; and nonparametric Spearman's correlation, mean relative difference (MRD), and temporal stability index (TSI) tests were applied to evaluate TOC stability. The Spearman's test showed a higher correlation between collection dates for CR30 than for CP35. The DRM showed more points with relative differences approaching zero for CP35, and more points with lower standard deviation for CR30. The TSI indicated a greater number of points to be used for CR30 because they have better temporal stability. Therefore, the TOC of the CR30 has better temporal stability than that of the CP35, presenting TSI of approximately 1.5-fold that of the CP35. The thinning of the vegetation in CR30 homogenized the soil TOC, whereas the fallow area, which were preserved, had greater heterogeneity.

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Diferenciação espectral de solos utilizando dados obtidos em laboratório e por sensor orbital

Cited by 18 publications

References 17 publications

Genesis and Classification of Soils from Subtropical Mountain Regions of Southern Brazil

Genesis and Classification of Soils from Subtropical Mountain Regions of Southern Brazil

Use of Remote Sensing in Precision Agriculture: A Bibliometric Analysis

Temporal Stability of Total Organic Carbon of Soils Under Different Uses in the Caatinga Biome

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