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| Registros recuperados: 60 | |
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| SILVA, L. M. da; PEREIRA, M. G.; BERNINI, T. A.; ANJOS, L. H. C. dos; WADT, P. G. S.; TAVARES, O. C. H.; GARCIA, A. C.. |
| A caracterização espectroscópica da matéria orgânica do solo (MOS) pode contribuir no entendimento da dinâmica da matéria orgânica em áreas sob floresta. O presente trabalho teve como objetivo realizar a caracterização da matéria orgânica por espectroscopia em horizontes superficiais de solos, formados a partir de material de origem de natureza sedimentar da Formação Solimões no estado do Acre. Foram selecionadas três topossequências sob floresta em diferentes regionais do Acre: Sena Madureira (T1) e Manoel Urbano (T2), na Regional do Purus, e Feijó (T3) na Regional do Tarauacá-Envira. Em cada topossequência foram abertas trincheiras em três pontos distintos: terço superior (S), terço médio (M) e terço inferior da elevação (I). Foi quantificado o carbono... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Materia orgánica del suelo; Espectroscopia infrarroja (por) transformada de Fourier; Formação Solimões; Solos sedimentares; Suelos sedimentarios; Sena Maureira (AC); Manoel Urbano (AC); Regional do Purus (AC); Feijó (AC); Regional do Tarauacá-Envira (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Solo; Matéria Orgânica; Sedimentary soils; Soil organic matter; Fourier transform infrared spectroscopy. |
| Ano: 2021 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1136538 |
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| Valladares,Gustavo Souza; Pereira,Marcos Gervasio; Benites,Vinícius de Melo; Anjos,Lúcia Helena Cunha dos; Ebeling,Adierson Gilvani; Guareschi,Roni Fernandes. |
| ABSTRACT Despite limited geographic expression of Organosols in Brazil, their high carbon storage capacity and natural environmental vulnerability justifies further studies on C and N stocks in these soils and their relationship to the nature of organic matter. Evaluation of physical and chemical properties of organic soils and their ability to store C is important so as to develop sustainable management practices for their preservation. The objectives of the study were to measure the total organic carbon stock (OCst), total nitrogen stock (Nst), and humic fractions in Organosols from different environments and regions of Brazil, and to correlate the data with soil chemical (pH, P, K, Ca2+, Mg2+, Al3+, H+Al, CEC, V) and physical properties (soil bulk... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil organic matter; Humic substances; Histic horizon; Physical and chemical properties. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100425 |
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| Bernardi,Alberto Carlos de Campos; Machado,Pedro Luiz Oliveira de Almeida; Madari,Beata Emoke; Tavares,Sílvio Roberto de Lucena; Campos,David Vilas Boas de; Crisóstomo,Lindbergue de Araújo. |
| Soil organic matter accumulation provides benefits to soil productivity and reduces atmospheric carbon concentration. However, little is known about the accumulation of C and N by sandy soils under perennial irrigated crops in semiarid regions. The objective of this study was to evaluate the effect of irrigated fruit orchard cultivation on the stocks of soil organic carbon (SOC) and total nitrogen (N) of an Arenosol/Quartzpsament from Paraipaba-CE, Semiarid Brazil. Soil samples were taken from irrigated orchards of banana (Musa ssp.), cashew (Anacardium ocidentale), guava (Psidium guajava), bullock's heart (Annona reticulata), mango (Mangifera indica), and sapote (Manilkara zapota) in the wetted-bulb and non-irrigated area between the plant rows.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Caatinga forest; Soil organic matter; Soil stratification index. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200010 |
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| Segnini,Aline; Carvalho,João Luís Nunes; Bolonhezi,Denizart; Milori,Débora Marcondes Bastos Pereira; Silva,Wilson Tadeu Lopes da; Simões,Marcelo Luiz; Cantarella,Heitor; Maria,Isabella C. de; Martin-Neto,Ladislau. |
| The maintenance of sugarcane (Saccharum spp.) straw on a soil surface increases the soil carbon (C) stocks, but at lower rates than expected. This fact is probably associated with the soil management adopted during sugarcane replanting. This study aimed to assess the impact on soil C stocks and the humification index of soil organic matter (SOM) of adopting no-tillage (NT) and conventional tillage (CT) for sugarcane replanting. A greater C content and stock was observed in the NT area, but only in the 0-5 cm soil layer (p < 0.05). Greater soil C stock (0-60 cm) was found in soil under NT, when compared to CT and the baseline. While C stock of 116 Mg ha-1 was found in the baseline area, in areas under CT and NT systems the values ranged from 120 to 127... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Laser-Induced Fluorescence Spectroscopy; Sugarcane replanting; Crop residues; No-tillage; Soil organic matter. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500006 |
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| Bayer,Cimélio; Dick,Deborah Pinheiro; Ribeiro,Genicelli Mafra; Scheuermann,Klaus Konrad. |
| Land use and soil management may affect both labile and humified soil organic matter (SOM) fractions, but the magnitude of these changes is poorly known in subtropical environments. This study investigated effects of four land use and soil management systems (forest, native pasture, and conventional tillage and no-tillage in a wheat/soybean succession) on (i) total soil organic carbon (SOC) stocks (0 to 250mm depth) and on (ii) carbon (C) stocks in labile (coarse, light) and humified (mineral-associated, humic substances) SOM fractions (0 to 25mm depth), in a Hapludox soil from southern Brazil. In comparison to the adjacent forest site, conventionally tilled soil presented 36% (46.2Mg ha-1) less SOC in the 0 to 250mm depth and a widespread decrease in C... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil organic matter; Physical fractionation; Light fraction; Coarse fraction; No-tillage. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782002000300006 |
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| Magalhaes,Sulamirtes S. de A.; Ramos,Fabricio T.; Weber,Oscarlina L. dos S.. |
| ABSTRACT Soil carbon (C) stock determination can subsidize discussions on the continuity of an agricultural management. This study aimed to evaluate the stocks of total organic C (STOC) and labile C (SLC), and the indices of C lability (CLI), C compartment (CCI) and C management (CMI), and correlate them with chemical and physical attributes of a Red Yellow Latosol (Oxisol) managed for 38 years with different tillage systems in a Cerrado region of Mato Grosso, Brazil. Disturbed and undisturbed soil samples were collected in three layers (0-0.05, 0.05-0.10 and 0.10-0.20 m). The CMI (CLI x CCI) showed higher STOC possibly as the tillage depth decreased, because none of the tillage systems conserved STOC and SLC in the layers of 0-0.05 and 0.05-0.10 m,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil conservation; Crop rotation; Soil organic matter. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000100085 |
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| COSTA, F. de S.; OLIVEIRA, T. K. de; BARDALES, N. G.; COSTA, C. R. da. |
| Os sistemas agroflorestais (SAFs) são uma alternativa viável para uso conservacionista do solo na Amazônia Brasileira, gerando renda para o produtor rural, aumentando a biodiversidade e a captura de carbono da atmosfera no solo e na vegetação. Considerando a importância desses aspectos, a pesquisa com SAFs está em processo de ampliação com foco, também, em mensuração de serviços ambientais associados. Este documento é fruto da cooperação dos conhecimentos tecnológico e tradicional na retomada do tema de SAF para o desenvolvimento rural na Amazônia. Apresenta parte inicial do conhecimento gerado desde o desenho do SAF em 2010 até o ano de 2015, enfatizando o que acontece com o solo na transição para SAFs. Destaca a importância de experimentos de longa... |
| Tipo: Documentos (INFOTECA-E) |
Palavras-chave: Sistema Agroflorestal (SAF); Agricultura conservacionista; Consórcio agroflorestal; Ruber tree; Colocação São Luís; Seringal Porvir; Epitaciolândia (AC); Fazenda São João; Senador Guiomard (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Agroforestería; Materia orgánica del suelo; Nitrógeno orgánico del suelo; Reservorios de carbono.; Agrossilvicultura; Seringueira; Hevea brasiliensis; Solo; Matéria orgânica; Carbono; Nitrogênio; Caucho.; Agroforestry; Soil organic matter; Carbon sinks; Soil organic nitrogen.. |
| Ano: 2016 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1072228 |
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| Farhate,Camila Viana Vieira; Souza,Zigomar Menezes de; Oliveira,Stanley Robson de Medeiros; Carvalho,João Luís Nunes; Scala Júnior,Newton La; Santos,Ana Paula Guimarães. |
| ABSTRACT: The use of data mining is a promising alternative to predict soil respiration from correlated variables. Our objective was to build a model using variable selection and decision tree induction to predict different levels of soil respiration, taking into account physical, chemical and microbiological variables of soil as well as precipitation in renewal of sugarcane areas. The original dataset was composed of 19 variables (18 independent variables and one dependent (or response) variable). The variable-target refers to soil respiration as the target classification. Due to a large number of variables, a procedure for variable selection was conducted to remove those with low correlation with the variable-target. For that purpose, four approaches of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil CO2 emission; Data mining; Variable selection; Soil temperature; Soil organic matter. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000300216 |
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| Oliveira,Fernanda Cristina Caparelli; Silva,Ivo Ribeiro; Ferreira,Gabriel William Dias; Soares,Emanuelle Mercês Barros; Silva,Sérgio Ricardo; Silva,Eulene Francisco. |
| ABSTRACT: Eucalyptus forests in southern Bahia (BA) are planted in soils with a sandy surface layer and humid tropical climate, conditions that lead to soil carbon (C) decomposition. Recent studies have shown that nitrogen (N) may be important for soil C stabilization. The aim of this study was to evaluate the contribution of Eucalyptus harvest residues and nitrogen fertilization to C stabilization in Ultisols of southern BA. The experiment was conducted in Eucalyptus clonal plantations cultivated in two regions of Eunápolis, BA, Brazil, with different clay content: southern region (140 g kg-1 of clay) and western region (310 g kg-1 of clay). Five treatments were evaluated: one control (CTR), without Eucalyptus harvest residues and N fertilization, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Planted forests; Harvest residue management; Soil organic matter; Stable isotope. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100501 |
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| Dijair,Thaís Santos Branco; Silva,Fernanda Magno; Teixeira,Anita Fernanda dos Santos; Silva,Sérgio Henrique Godinho; Guilherme,Luiz Roberto Guimarães; Curi,Nilton. |
| ABSTRACT Portable X-ray fluorescence (pXRF) spectrometry has been useful worldwide for determining soil elemental content under both field and laboratory conditions. However, the field results are influenced by several factors, including soil moisture (M), soil texture (T) and soil organic matter (SOM). Thus, the objective of this work was to create linear mathematical models for conversion of Al2O3, CaO, Fe, K2O, SiO2, V, Ti and Zr contents obtained by pXRF directly in field to those obtained under laboratory conditions, i.e., in air-dried fine earth (ADFE), using M, T and SOM as auxiliary variables, since they influence pXRF results. pXRF analyses in field were performed on 12 soil profiles with different parent materials. From them, 59 samples were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: PXRF; Soil moisture; Soil texture; Soil organic matter; Prediction models. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100211 |
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| SILVA, L. M. da; RODRIGUES, M. de J. M.; TAVARES, O. C. H.; SANTOS, O. A. Q. dos; WADT, P. G. S.; PEREIRA, M. G.. |
| Os teores de carbono orgânico total (COT) no solo podem ser determinados por técnicas que se baseiam tanto na combustão por via úmida quanto por via seca. No entanto, a primeira apresenta-se como uma técnica demorada, porém, largamente utilizado nos laboratórios brasileiros para análise de solos. O objetivo da presente pesquisa é analisar os teores de carbono orgânico de solos do Acre submetidos à diferentes procedimentos analíticos. As amostras foram submetidas a diferentes condições de tratamento sendo aquecidas e não aquecidas, maceradas e não maceradas, bem como variar a concentração do titulante, sendo empregadas seis diferentes formas de determinação do carbono. Verificou-se que todos os métodos empregados apresentaram alta e significativa correlação... |
| Tipo: Folhetos |
Palavras-chave: Carbono orgânico; Métodos analíticos; Formação Solimões; Acre; Amazônia Ocidental; Western Amazon; Química do Solo; Matéria Orgânica; Soil organic carbon; Soil chemistry; Soil organic matter; Analytical methods. |
| Ano: 2021 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1136679 |
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| Marques,Jean Dalmo de Oliveira; Luizão,Flávio Jesus; Teixeira,Wenceslau Geraldes; Sarrazin,Max; Ferreira,Sávio José Filgueira; Beldini,Troy Patrick; Marques,Elizalane Moura de Araújo. |
| 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fractionation; Soil organic matter; Land use; Soil physical fractions. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100232 |
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| Montes-Pulido,Carmen Rosa; Ramos-Miras,José Joaquín; San José -Wery,Ana María. |
| Abstract The vertical distribution of soil organic carbon (SOC), considered to be a key component of the carbon cycle, is still poorly understood in tropical highest mountain ecosystems such as the Andean paramo. The estimation of the SOC in the presence and absence of anthropic intervention, will help to define policies to mitigate CO2 emissions into the atmosphere from this ecosystem. The aim of this research was to determine soil organic carbon sequestration at three soil depths under two types of soil use in the paramo of Sumapaz, Colombia. The soil variations of pH, phosphorus, aluminum, bulk density, carbon sequestration, cation exchange capacity, texture and to estimate the vertical distribution of soil organic carbon SOC, were evaluated,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Andisols; Root carbon; Soil organic matter; Vertical distribution. |
| Ano: 2017 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000100095 |
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| Registros recuperados: 60 | |
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