Wenceslau Geraldes Teixeira - Academia.edu (original) (raw)

Papers by Wenceslau Geraldes Teixeira

As relacoes entre a macrofauna por grupo funcional sobre as propriedades e processos do solo, sao... more As relacoes entre a macrofauna por grupo funcional sobre as propriedades e processos do solo, sao essenciais, para o manejo da fertilidade biologica do solo sob os agroecossistemas tropicais. Neste estudo foram avaliadas: a relacao entre a biomassa dos principais grupos funcionais da macrofauna e o volume dos macroporos do solo ao redor do caule da area de influencia das arvores componentes de dois Sistemas Agroflorestais e Capoeiras adjacentes. Os metodos empregados foram: (i) macrofauna monolito TSBF; (ii) macroporos amostras com estrutura indeformada de solo. Os resultados: (i) A biomassa dos decompositores foi positivamente correlacionada com o volume dos macroporos do solo de 0-15 cm; (iii) A biomassa total da macrofauna foi o segundo melhor grupo correlacionado com o volume dos macroporos do solo, principalmente com a primeira camada (0-5 cm); (iv) A biomassa dos engenheiros-do-solo nao foi apresentou correlacao significativa com o volume dos macroporos das tres profundidades;...

ABSTRACTAdvancing extensive cattle production shifts the forest landscape and is considered one o... more ABSTRACTAdvancing extensive cattle production shifts the forest landscape and is considered one of the main drivers against biodiversity conservation in the Brazilian Amazonia. Considering soil as an ecosystem it becomes vital to identify the effects of land-use changes on soil microbial communities, structure, as well as its ecological functions and services. Herein, we explored relationships between land-use, soil types and forest floor (i.e., association between litter, root layer and bulk soil) on the prokaryotic metacommunity structuring in the Western Amazonia. Sites under high anthropogenic pressure were evaluated along a gradient of ± 800 km. Prokaryotic metacommunity are synergistically affected by soil types and land-use systems. Especially, the gradient of soil fertility and land-use shapes the structuring of the metacommunity and determines its composition. Forest-to-pasture conversion increases alpha, beta, and gamma diversities when considering only the prokaryotes fro...

Revista Virtual de Química, 2020

Revista Brasileira de Ciência do Solo, 2020

Amazonian Dark Earths: Wim Sombroek's Vision

PloS one, 2017

Anthrosols known as Amazonian Dark Earth (ADE) have borne witness to the intensification of seden... more Anthrosols known as Amazonian Dark Earth (ADE) have borne witness to the intensification of sedentary patterns and the demographic increase in Central Amazon. As a result, a recurring pattern has been observed of mounds with ADE arising from domestic activities and the disposal of waste. The objective of this research was to demonstrate the relationship of these anthropic activities with pedogenetic formation processes of ADE in the municipality of Iranduba, Brazil. Disturbed and undisturbed soil samples were taken from two areas of ADE (pretic horizon) and from a non-anthropic pedon. Physical, chemical, micromorphological and SEM-EDS analyses were performed. The coarse material of the pretic horizons consisted predominantly of quartz, iron nodules, ceramics and charcoal fragments, and the fine material is organo-mineral. There was a direct relationship between the color of pretic horizons and the number of charcoal fragments. The thickness of the ADE results from the redistribution...

Revista do Museu de Arqueologia e Etnologia, 2012

Escavações arqueológicas desenvolvidas no sambaqui fluvial Moraes, no município de Miracatu, SP, ... more Escavações arqueológicas desenvolvidas no sambaqui fluvial Moraes, no município de Miracatu, SP, revelaram distintas camadas arqueológicas que resultaram na configuração monticular deste sítio. Com o objetivo de discutir o processo formativo deste sítio, foram realizadas análises físico-químicas do solo de dentro e de fora do mesmo para a compreensão das propriedades que podem ter contribuído para a caracterização das particularidades encontradas nas camadas arqueológicas deste sambaqui fluvial. Foi constatada uma elevada alteração em alguns parâmetros físicos e químicos dos diferentes horizontes do solo desenvolvido no sambaqui. Em especial os elevados teores de fósforo corroboram um enriquecimento deste ambiente em resíduos antrópicos ricos neste elemento (e.g. ossos). Os horizontes escuros também mostram elevados teores de carbono em relação ao perfil testemunho. Entretanto, ainda não está claro se a estabilização do carbono nos sambaquis se deve à estabilização do cálcio ou efei...

Revista Árvore, 2016

The soil carbon under Amazonian forests has an important roles in global changing, making informa... more The soil carbon under Amazonian forests has an important roles in global changing, making information on the soil content and depths of these stocks are considerable interest in efforts to quantify soil carbon emissions to the atmosphere.This study quantified the content and soil organic carbon stock under primary forest up to 2 m depth, at different topographic positions, at Cuieiras Biological Reserve, Manaus/ ZF2, km 34, in the Central Amazon, evaluating the soil attributes that may influence the permanence of soil carbon. Soil samples were collected along a transect of 850 m on topographic gradient Oxisol (plateau), Ultisol (slope) and Spodosol (valley). The stocks of soil carbon were obtained by multiplying the carbon content, soil bulk density and trickiness of soil layers. The watershed was delimited by using STRM and IKONOS images and the carbon contend obtained in the transects was extrapolated as a way to evaluate the potential for carbon stocks in an area of 2678.68 ha. T...

Revista Brasileira de Ciência do Solo, 2015

Organic matter plays an important role in many soil properties, and for that reason it is necessa... more Organic matter plays an important role in many soil properties, and for that reason it is necessary to identify management systems which maintain or increase its concentrations. The aim of the present study was to determine the quality and quantity of organic C in different compartments of the soil fraction in different Amazonian ecosystems. The soil organic matter (FSOM) was fractionated and soil C stocks were estimated in primary forest (PF), pasture (P), secondary succession (SS) and an agroforestry system (AFS). Samples were collected at the depths 0-5, 5-10, 10-20, 20-40, 40-60, 60-80, 80-100, 100-160, and 160-200 cm. Densimetric and particle size analysis methods were used for FSOM, obtaining the following fractions: FLF (free light fraction), IALF (intra-aggregate light fraction), F-sand (sand fraction), F-clay (clay fraction) and F-silt (silt fraction). The 0-5 cm layer contains 60 % of soil C, which is associated with the FLF. The F-clay was responsible for 70 % of C retain...

Revista de Ciências Agrarias - Amazon Journal of Agricultural and Environmental Sciences, 2012

Amazonian Dark Earths: Wim Sombroek's Vision

Revista Brasileira de Ciência do Solo, 2013

As várzeas do rio Solimões são áreas inundáveis com predomínio de Gleissolos, onde se estabeleceu... more As várzeas do rio Solimões são áreas inundáveis com predomínio de Gleissolos, onde se estabeleceu grande parte da população rural do Estado do Amazonas. Os objetivos deste trabalho foram caracterizar e classificar cinco perfis de Gleissolos, distribuídos em três áreas da bacia do Médio Amazonas, localizados nas várzeas dos municípios de Manacapuru e Iranduba. Após a descrição morfológica dos solos, coletaram-se amostras dos seus horizontes para caracterização física, química e mineralógica. Similarmente, todos os perfis apresentaram expressiva gleização na matriz do solo, com cores cinzenta a cinzenta-esverdeada, nos horizontes mais superficiais, e cinzenta-clara a cinzenta-escura, nos subsuperficiais, denotando a redução do ferro. Os teores mais elevados da fração areia em horizontes de subsuperfície indicaram presença de diferentes camadas de deposição fluvial, enquanto os elevados teores de silte evidenciaram a natureza sedimentar recente e o baixo grau de desenvolvimento pedogen...

Revista Brasileira de Ciência do Solo, 2013

Large areas of Plinthosols with ferruginous materials such as plinthite and/or petroplinthite are... more Large areas of Plinthosols with ferruginous materials such as plinthite and/or petroplinthite are fairly common in the Brazilian Amazon basin. This work was carried out to investigate the chemical behavior, mineralogical composition and weathering stage of four representative soil profiles with plinthite and petroplinthite, in Iranduba, AM (Central Amazon). Three well-drained soil profiles at high elevations were studied (P1, Plinthic Vetic Ferralsol; P2 and P3, Vetic Endopetric Plinthosol) and a contrasting poorly drained soil (P4 Haplic Plinthosol), located at low elevation. After profile descriptions, soil samples were collected from each horizon, air-dried, sieved (2 mm), and analyzed for particle-size distribution, pH, exchangeable cations (Al3+, Ca2+, Mg2+, K+, and Na+), as well as available P and total organic carbon (TOC) content. The minerals present in the clay and sand fractions, as well as in the ferruginous materials were identified by X-ray Diffraction (XRD). The weath...

Amazonian Dark Earths: Explorations in Space and Time, 2004

As relacoes entre a macrofauna por grupo funcional sobre as propriedades e processos do solo, sao... more As relacoes entre a macrofauna por grupo funcional sobre as propriedades e processos do solo, sao essenciais, para o manejo da fertilidade biologica do solo sob os agroecossistemas tropicais. Neste estudo foram avaliadas: a relacao entre a biomassa dos principais grupos funcionais da macrofauna e o volume dos macroporos do solo ao redor do caule da area de influencia das arvores componentes de dois Sistemas Agroflorestais e Capoeiras adjacentes. Os metodos empregados foram: (i) macrofauna monolito TSBF; (ii) macroporos amostras com estrutura indeformada de solo. Os resultados: (i) A biomassa dos decompositores foi positivamente correlacionada com o volume dos macroporos do solo de 0-15 cm; (iii) A biomassa total da macrofauna foi o segundo melhor grupo correlacionado com o volume dos macroporos do solo, principalmente com a primeira camada (0-5 cm); (iv) A biomassa dos engenheiros-do-solo nao foi apresentou correlacao significativa com o volume dos macroporos das tres profundidades;...

ABSTRACTAdvancing extensive cattle production shifts the forest landscape and is considered one o... more ABSTRACTAdvancing extensive cattle production shifts the forest landscape and is considered one of the main drivers against biodiversity conservation in the Brazilian Amazonia. Considering soil as an ecosystem it becomes vital to identify the effects of land-use changes on soil microbial communities, structure, as well as its ecological functions and services. Herein, we explored relationships between land-use, soil types and forest floor (i.e., association between litter, root layer and bulk soil) on the prokaryotic metacommunity structuring in the Western Amazonia. Sites under high anthropogenic pressure were evaluated along a gradient of ± 800 km. Prokaryotic metacommunity are synergistically affected by soil types and land-use systems. Especially, the gradient of soil fertility and land-use shapes the structuring of the metacommunity and determines its composition. Forest-to-pasture conversion increases alpha, beta, and gamma diversities when considering only the prokaryotes fro...

Revista Virtual de Química, 2020

Revista Brasileira de Ciência do Solo, 2020

Amazonian Dark Earths: Wim Sombroek's Vision

PloS one, 2017

Anthrosols known as Amazonian Dark Earth (ADE) have borne witness to the intensification of seden... more Anthrosols known as Amazonian Dark Earth (ADE) have borne witness to the intensification of sedentary patterns and the demographic increase in Central Amazon. As a result, a recurring pattern has been observed of mounds with ADE arising from domestic activities and the disposal of waste. The objective of this research was to demonstrate the relationship of these anthropic activities with pedogenetic formation processes of ADE in the municipality of Iranduba, Brazil. Disturbed and undisturbed soil samples were taken from two areas of ADE (pretic horizon) and from a non-anthropic pedon. Physical, chemical, micromorphological and SEM-EDS analyses were performed. The coarse material of the pretic horizons consisted predominantly of quartz, iron nodules, ceramics and charcoal fragments, and the fine material is organo-mineral. There was a direct relationship between the color of pretic horizons and the number of charcoal fragments. The thickness of the ADE results from the redistribution...

Revista do Museu de Arqueologia e Etnologia, 2012

Escavações arqueológicas desenvolvidas no sambaqui fluvial Moraes, no município de Miracatu, SP, ... more Escavações arqueológicas desenvolvidas no sambaqui fluvial Moraes, no município de Miracatu, SP, revelaram distintas camadas arqueológicas que resultaram na configuração monticular deste sítio. Com o objetivo de discutir o processo formativo deste sítio, foram realizadas análises físico-químicas do solo de dentro e de fora do mesmo para a compreensão das propriedades que podem ter contribuído para a caracterização das particularidades encontradas nas camadas arqueológicas deste sambaqui fluvial. Foi constatada uma elevada alteração em alguns parâmetros físicos e químicos dos diferentes horizontes do solo desenvolvido no sambaqui. Em especial os elevados teores de fósforo corroboram um enriquecimento deste ambiente em resíduos antrópicos ricos neste elemento (e.g. ossos). Os horizontes escuros também mostram elevados teores de carbono em relação ao perfil testemunho. Entretanto, ainda não está claro se a estabilização do carbono nos sambaquis se deve à estabilização do cálcio ou efei...

Revista Árvore, 2016

The soil carbon under Amazonian forests has an important roles in global changing, making informa... more The soil carbon under Amazonian forests has an important roles in global changing, making information on the soil content and depths of these stocks are considerable interest in efforts to quantify soil carbon emissions to the atmosphere.This study quantified the content and soil organic carbon stock under primary forest up to 2 m depth, at different topographic positions, at Cuieiras Biological Reserve, Manaus/ ZF2, km 34, in the Central Amazon, evaluating the soil attributes that may influence the permanence of soil carbon. Soil samples were collected along a transect of 850 m on topographic gradient Oxisol (plateau), Ultisol (slope) and Spodosol (valley). The stocks of soil carbon were obtained by multiplying the carbon content, soil bulk density and trickiness of soil layers. The watershed was delimited by using STRM and IKONOS images and the carbon contend obtained in the transects was extrapolated as a way to evaluate the potential for carbon stocks in an area of 2678.68 ha. T...

Revista Brasileira de Ciência do Solo, 2015

Organic matter plays an important role in many soil properties, and for that reason it is necessa... more Organic matter plays an important role in many soil properties, and for that reason it is necessary to identify management systems which maintain or increase its concentrations. The aim of the present study was to determine the quality and quantity of organic C in different compartments of the soil fraction in different Amazonian ecosystems. The soil organic matter (FSOM) was fractionated and soil C stocks were estimated in primary forest (PF), pasture (P), secondary succession (SS) and an agroforestry system (AFS). Samples were collected at the depths 0-5, 5-10, 10-20, 20-40, 40-60, 60-80, 80-100, 100-160, and 160-200 cm. Densimetric and particle size analysis methods were used for FSOM, obtaining the following fractions: FLF (free light fraction), IALF (intra-aggregate light fraction), F-sand (sand fraction), F-clay (clay fraction) and F-silt (silt fraction). The 0-5 cm layer contains 60 % of soil C, which is associated with the FLF. The F-clay was responsible for 70 % of C retain...

Revista de Ciências Agrarias - Amazon Journal of Agricultural and Environmental Sciences, 2012

Amazonian Dark Earths: Wim Sombroek's Vision

Revista Brasileira de Ciência do Solo, 2013

As várzeas do rio Solimões são áreas inundáveis com predomínio de Gleissolos, onde se estabeleceu... more As várzeas do rio Solimões são áreas inundáveis com predomínio de Gleissolos, onde se estabeleceu grande parte da população rural do Estado do Amazonas. Os objetivos deste trabalho foram caracterizar e classificar cinco perfis de Gleissolos, distribuídos em três áreas da bacia do Médio Amazonas, localizados nas várzeas dos municípios de Manacapuru e Iranduba. Após a descrição morfológica dos solos, coletaram-se amostras dos seus horizontes para caracterização física, química e mineralógica. Similarmente, todos os perfis apresentaram expressiva gleização na matriz do solo, com cores cinzenta a cinzenta-esverdeada, nos horizontes mais superficiais, e cinzenta-clara a cinzenta-escura, nos subsuperficiais, denotando a redução do ferro. Os teores mais elevados da fração areia em horizontes de subsuperfície indicaram presença de diferentes camadas de deposição fluvial, enquanto os elevados teores de silte evidenciaram a natureza sedimentar recente e o baixo grau de desenvolvimento pedogen...

Revista Brasileira de Ciência do Solo, 2013

Large areas of Plinthosols with ferruginous materials such as plinthite and/or petroplinthite are... more Large areas of Plinthosols with ferruginous materials such as plinthite and/or petroplinthite are fairly common in the Brazilian Amazon basin. This work was carried out to investigate the chemical behavior, mineralogical composition and weathering stage of four representative soil profiles with plinthite and petroplinthite, in Iranduba, AM (Central Amazon). Three well-drained soil profiles at high elevations were studied (P1, Plinthic Vetic Ferralsol; P2 and P3, Vetic Endopetric Plinthosol) and a contrasting poorly drained soil (P4 Haplic Plinthosol), located at low elevation. After profile descriptions, soil samples were collected from each horizon, air-dried, sieved (2 mm), and analyzed for particle-size distribution, pH, exchangeable cations (Al3+, Ca2+, Mg2+, K+, and Na+), as well as available P and total organic carbon (TOC) content. The minerals present in the clay and sand fractions, as well as in the ferruginous materials were identified by X-ray Diffraction (XRD). The weath...

Amazonian Dark Earths: Explorations in Space and Time, 2004