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Matias, Maria da Conceição Bezerra da Silva; UFPI; Salviano, Adeodato Ari Cavalcante; UFPI; Leite, Luiz Fernando de Carvalho; EMBRAPA; Araújo, Ademir Sérgio Ferreira de; UFPI. |
O objetivo do trabalho foi verificar os efeitos de diferentes sistemas de manejo sobre a biomassa microbiana e os estoques totais de carbono orgânico e nitrogênio em um Latossolo Amarelo. Os sistemas de manejos avaliados foram: plantio direto (PD), preparo convencional (PC), além de uma área recém-desmatada (ARD) e uma com vegetação nativa (AVN). As amostras de solo foram coletadas nas profundidades de 0-5, 5-10 e 10-20 cm. Nessas amostras, foram determinados os teores e estoques totais de C e N, a respiração basal, o carbono da biomassa microbiana (Cmic) e os quocientes microbiano (Cmic/COT) e metabólico (qCO2). A área sob plantio direto apresentou maiores teores de C e N, além de estoques de C na superfície do solo. Para os estoques de N, não houve... |
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Palavras-chave: 5.01.00.00-9 Agronomia plantio direto; Biomassa microbiana; Respiração basal Microbiologia e Bioquímica do Solo no-tillage; Microbial biomass; Basal respiration. |
Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/687 |
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Bini,Daniel; Figueiredo,Aline Fernandes; Silva,Mylenne Cacciolari Pinheiro da; Vasconcellos,Rafael Leandro de Figueiredo; Cardoso,Elke Jurandy Bran Nogueira. |
Studies on microbial activity and biomass in forestry plantations often overlook the role of litter, typically focusing instead on soil nutrient contents to explain plant and microorganism development. However, since the litter is a significant source of recycled nutrients that affect nutrient dynamics in the soil, litter composition may be more strongly correlated with forest growth and development than soil nutrient contents. This study aimed to test this hypothesis by examining correlations between soil C, N, and P; litter C, N, P, lignin content, and polyphenol content; and microbial biomass and activity in pure and mixed second-rotation plantations of Eucalyptus grandis and Acacia mangium before and after senescent leaf drop. The numbers of cultivable... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microorganism; Litterfall; Bioindicators; Forestry; Legumes; Basal respiration. |
Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000100008 |
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Armenta,Renato; Vaca,Rocio; Lugo,Jorge; del Aguila,Pedro. |
The application of sewage sludge is a concern because it may affect the quality of organic matter and microbiological and biochemical soil properties. The effects of surface application of sewage sludge to an agricultural soil (at 18 and 36 t ha-1 dry basis) were assessed in one maize (Zea mays L.) growing season. The study evaluated microbial biomass, basal respiration and selected enzymatic activities (catalase, urease, acid and alkaline phosphatase, and β-glucosidase) 230 days after sewage sludge application and infrared spectroscopy was used to assess the quality of dissolved organic matter and humic acids. Sewage sludge applications increased the band intensity assigned to polysaccharides, carboxylic acids, amides and lignin groups in the soil. The... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Basal respiration; Biosolids; Enzymatic activities; Metabolic quotient; Microbial biomass. |
Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000500029 |
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