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| Registros recuperados: 56 | |
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| Staelens,Jeroen; Godoy,Roberto; Oyarzún,Carlos; Thibo,Karen; Verheyen,Kris. |
| Nitrogen return by leaf litterfall was compared with atmospheric nitrogen deposition for two deciduous Nothofagus stands in southern Chile, located in areas with contrasting land use. The litterfall return of nitrogen in a Nothofagus alpina (Poepp. et Endl.) Oerst. stand at San Pablo de Tregua, in the Cordillera de los Andes, was similar to the litterfall return in a Nothofagus obliqua (Mirb.) Oerst. stand at Paillaco, in the Central Depression. In contrast, the net throughfall and stemflow deposition differed significantly between the two stands. At San Pablo de Tregua, the annual bulk deposition of NH4+ and NO3- was significantly higher than the throughfall and stemflow deposition reaching the forest floor. This demonstrates an uptake of inorganic... |
| Tipo: Journal article |
Palavras-chave: Ammonium; Atmospheric deposition; Canopy interactions; Nitrate; Nutrient cycling; Amonio; Ciclos de nutrientes; Depositación atmosférica; Interacciones del dosel; Nitrato. |
| Ano: 2005 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200002 |
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| Torres,José LR; Ciabotti,Elaine D; Gomes,Fernando RC; Leal Junior,André LB; Vieira,Dinamar MS; Costa,Luciene L. |
| ABSTRACT Cauliflower and cabbage require high amounts of nutrients in short periods of time; however, the intensive use of inorganic fertilizers can cause nutritional imbalances in these crops and reduce the quality of the final product. This study evaluated the chemical composition and yield of no-till cauliflower and cabbage grown on residues of various cover crops in Uberaba, Minas Gerais State, Brazil. The experimental design was randomized blocks with four cover crops (sunn hemp, brachiaria, pearl millet and fallow) and two main crops (cauliflower and cabbage). The treatments were evaluated on plots of 20 m2 with four replications. The following traits were analyzed after harvest: moisture (MO), ash (ASH), lipid (LIP), crude fiber (CF), protein (PTN),... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brassica oleracea var. botrytis; Brassica oleracea var. capitata; Crop residues; Nutrient cycling; Plant quality.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362017000200252 |
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| POMPEU, R. C. F. F.; SOUZA, H. A. de; FARIAS, J. L. de S.; BEZERRA, J. W. T.; FERNANDES, F. E. P.; PEREIRA, P. L.; ARAUJO, M. R. A. de; RIELLA, J.. |
| Objetivou-se avaliar a produção de biomassa, composição química e os atributos químicos do solo do consórcio milho-leguminosas forrageiras numa comunidade do município de Sobral, CE. Foram avaliados os consórcios milho-cunhã e milho-crotalária num delineamento de blocos completos casualizados, com quatro repetições. As parcelas experimentais foram constituídas de seis fileiras, com 5 m de comprimento, espaçadas entre si de um metro entre milho. O plantio do milho foi realizado no dia 01 de março de 2019, enquanto que o plantio das leguminosas foi realizado no dia 14 de março de 2019. Foram observadas diferenças de teores de matéria seca entre os consórcios cunhã-milho e crotalária-milho. Observou-se que a produção do consórcio crotalária-milho foi superior... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Feed crops; Nutrient cycling; Semiárido; Brasil; Região Nordeste; Leguminosa Forrageira; Cunha; Cobertura Morta; Volumosos; Alimento Para Animal; Forage production; Forage crops; Mulching; Biomass production; Intercropping; Brazil; Semiarid soils. |
| Ano: 2019 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1117068 |
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| PARRON, L. M.; BUSTAMANTE, M. M. da C.; PRADO, C. L. C.. |
| RESUMO: Em função do gradiente de umidade na topografia do terreno e de diferenças entre estações seca e chuvosa, o presente trabalho teve como objetivos quantificar a produção anual e a disponibilidade de nutrientes (N, P, K, Ca, Mg E S) na serapilheira e estimar a eficiência do uso de nutrientes em uma Mata de Galeria. O experimento foi estabelecido numa área de 100 x 100 m da Mata de Galeria do Córrego Pitoco, na Reserva Ecológica do IBGE, DF (15°56'41"S e 47°56'07"W). Como delineamento experimental, foram estabelecidas três linhas de amostragem paralelas ao córrego, distantes 45 m entre si, denominadas, respectivamente, comunidades úmida (na margem do córrego), intermediárias e seca (adjacentes a uma área de Cerrado Típico). A produção de serapilheira... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Biogeoquímica; Ciclagem de nutriente; Eficiência de nutriente; Savana; Productivity; Nutrient cycling; Litterfall; Nutrient efficiency.; Disponibilidade de Nutriente; Floresta Tropical; Produtividade.; Biogeochemistry; Tropical forests.; Savannas. |
| Ano: 2004 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569203 |
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| Souchu, Philippe; Vaquer A, André; Collos, Yves; Landrein, Sonia; Deslous-paoli, Jean-marc; Bibent, Bertrand. |
| Thau lagoon is a Mediterranean shellfish ecosystem with large biomasses of oysters growing in waters with high residence time due to low tidal ranges, The influence of filter feeders (oysters and their epibiota) on the spatial distribution of particulate and dissolved compounds in the water column of Thau lagoon was studied through its variation with time, In 1991/1992, daily variations were investigated in pens, corridors and outside shellfish farming zones for nutrients, chlorophyll a and primary production. Salinity, dissolved oxygen, nutrients, organic matter and chlorophyll a were also monitored in surface waters inside and outside shellfish farming zones each week from January 1993 to March 1994. The presence of shellfish farms led to a decrease by... |
| Tipo: Text |
Palavras-chave: Thau lagoon; Carrying capacity; Nutrient cycling; Phytoplankton; Suspension feeding bivalves. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/publication-808.pdf |
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| Crosta, X; Shemesh, A; Etourneau, J; Yam, R; Billy, I; Pichon, Jj. |
| Most high-southern latitude records of carbon and nitrogen isotopic ratios and elemental ratios are from the Antarctic and Polar Front zones, thus hindering a comprehensive view of nutrient cycling in the Southern Ocean. We present, for the first time, two records from the Subantarctic Zone and the southern Subtropical Zone of the Indian Ocean. These records provide a latitudinal transect covering the main oceanographic systems of the Southern Ocean. Carbon and nitrogen content of the diatom-bound organic matter increases during the last glacial in the Antarctic and Subantarctic zones but does not show a clear climate-related signal in the Subtropical Zone. Comparison of these records with sea-surface temperatures reconstructed at the core locations and... |
| Tipo: Text |
Palavras-chave: Diatoms; Nutrient cycling; Southern Ocean. |
| Ano: 2005 |
URL: https://archimer.ifremer.fr/doc/00230/34075/32543.pdf |
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| Van Langenhove, Leandro; Verryckt, Lore T.; Bréchet, Laëtitia; Courtois, Elodie A.; Stahl, Clement; Hofhansl, Florian; Bauters, Marijn; Sardans, Jordi; Boeckx, Pascal; Fransen, Erik; Peñuelas, Josep; Janssens, Ivan A.. |
| Atmospheric deposition is an important component of the nutrient cycles of terrestrial ecosystems, but field measurements are especially scarce in tropical regions. In this study we analysed 15 months of precipitation chemistry collected in an old growth tropical forest located in French Guiana. We measured nutrient inputs via bulk precipitation and throughfall and used the canopy budget model to estimate nutrient fluxes via canopy exchange and dry deposition. Based on this method we quantified net fluxes of macronutrients and compared their contribution to internal cycling rates via litterfall. Our results suggest that while atmospheric deposition of nitrogen was relatively high (13 kg ha−1 year−1), and mainly in organic forms, the N inputs via litterfall... |
| Tipo: Text |
Palavras-chave: Throughfall; Litterfall; Nutrient cycling; Nitrogen; Phosphorus; Potassium. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00629/74123/73572.pdf |
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| Aoki,C; Lopes,FS; de Oliveira,AMR; Souza,FL de; Marques,MR. |
| Large-bodied arthropods, such as cicadas, can be able to reallocate significant amounts of nutrients during adult emergence. Evidence suggests that Quesada gigas Olivier emergence constitutes an important nutrient flux from belowground to aboveground. The purpose of this study was to estimate the amount of nitrogen, proteins, and lipids resulting from the emergence of Q. gigas in an urban ecosystem in Central Brazil. Adult specimens captured from September to November 2006 were weighed and submitted to biochemical analysis. Population density was approximately 4,200 individuals per hectare. Mean individual dry mass was 1.03 g and contained 12.6% proteins, 8.4% lipids, and 5% nitrogen. Total biomass input from the species was 4.3 kg ha-1 y-1, with a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Annual cicada; Biomass; Energy; Nutrient cycling; Chain feed. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000400004 |
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| Martins, Emerson Gonçalves; Ferreira, Carlos Alberto; Neves, Edinelson Jsosé Maciel; Inoue, Mario Takao. |
| Foram avaliadas a deposição de serapilheira e de nutrientes em quatro procedências de grevilea (Grevillea robusta Cunn), de quatro anos de idade, plantadas na Região de Quedas do Iguaçu, em solo classificado como LATOSSOLO VERMELHO Distroférrico (Haplustox). Os resultados possibilitaram as seguintes conclusões: 1) A grevilea produz em média 10267 kg de serapilheira por hectare/ano, superando as produções observadas em povoamentos de Pinus e Eucalyptus. 2) A concentração dos macronutrientes na serapilheira não tem relação com o crescimento volumétrico, exceto de P, que se apresenta em maior concentração em povoamentos com a menor produção volumétrica de média. 3) As procedências mais produtivas em madeira tenderam a depositar, pela serapilheira, as maiores... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ciclagem de nutrientes; Elementos minerais; Volume de madeira Litter; Nutrient cycling; Nutrient deposition; Wood volume. |
| Ano: 2004 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1597 |
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| Assmann,Joice Mari; Anghinoni,Ibanor; Martins,Amanda Posselt; Costa,Sérgio Ely Valadão Gigante de Andrade; Kunrath,Taise Robinson; Bayer,Cimélio; Carvalho,Paulo Cesar de Faccio; Franzluebbers,Alan Joseph. |
| Abstract:The objective of this work was to evaluate the effect of grazing intensity on the decomposition of cover crop pasture, dung, and soybean residues, as well as the C and N release rates from these residues in a long-term integrated soybean-beef cattle system under no-tillage. The experiment was initiated in 2001, with soybean cultivated in summer and black oat + Italian ryegrass in winter. The treatments consisted of four sward heights (10, 20, 30, and 40 cm), plus an ungrazed area, as the control. In 2009-2011, residues from pasture, dung, and soybean stems and leaves were placed in nylon-mesh litter bags and allowed to decompose for up to 258 days. With increasing grazing intensity, residual dry matter of the pasture decreased and that of dung... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Avena strigose; Glycine max; Lolium multiflorum; Integrated crop-livestock; Nutrient cycling; Soil organic matter.. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015001000967 |
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| Winckler,Lilian Terezinha; Güths,Angélica Konradt; Gayer,Pâmela Rodrigues. |
| Abstract: The objective of this work was to evaluate the ecosystem functions of a natural wetland and of artificially flooded rice areas, managed under organic and conventional systems, by phytomass degradation and by the colonization of this material by benthic macroinvertebrates. The experiment was carried out in a natural wetland area, and in two flooded rice areas managed under organic and conventional systems. Twenty-five decomposition bags filled with 10 g of dry vegetation were installed in each site. At 14, 28, 42, 56, and 70 days after the beginning of the experiment, five bags from each site were collected. Macroinvertebrates were identified and classified by functional trophic group. The number of species of benthic macroinvertebrates increased:... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Aqualf; Biomass degradation; Ecosystem services; Nutrient cycling; Paddy soils. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000400261 |
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| Balota,Elcio Liborio; Machineski,Oswaldo; Truber,Priscila Viviane. |
| The objective of this work was to evaluate the change in soil C and N mineralization due to successive pig slurry application under conventional tillage (CT) and no tillage (NT) systems. The experiment was carried out in a clayey Latossolo Vermelho eutrófico (Rhodic Eutrudox) in Palotina, PR, Brazil. Increasing doses of pig slurry (0, 30, 60 and 120 m³ ha-1 per year) were applied in both tillage systems, with three replicates. Half of the pig slurry was applied before summer soil preparation, and the other half before the winter crop season. The areas were cultivated with soybean (Glycine max L.) and maize (Zea mays L.) in the summers of 1998 and 1999, respectively, and with wheat (Triticum sativum Lam.) in the winters of both years. Soil samples were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conventional tillage; No tillage; Nutrient cycling; Potential mineralization; Swine manure. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000500011 |
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| MORAES,REGINA MARIA DE; DELITTI,WELINGTON BRAZ CARVALHO; STRUFFALDI-DE VUONO,YARA. |
| Litterfall and transfer of nutrients was estimated in two tropical coastal forests of Brazil - the Atlantic and the Restinga Forests at Cardoso Island, São Paulo. Samples were collected monthly, from June 1990 to May 1991, using thirty 0.25 m2 traps. There were significant differences in litter production between the Atlantic Forest (6.3 t.ha-1.year-1) and the Restinga Forest (3.9 t.ha-1.year-1). Litterfall was continuous throughout the year with maximum in the beginning of the rainy season in both sites. The annual return of mineral elements through litter in the Atlantic Forest was (kg.ha-1): 101.8 N, 3.8 P, 20.3 K, 60.0 Ca, 18.0 Mg, and 14.6 S and in the Restinga Forest was: 27.5 N, 1.0 P, 6.5 K, 30.0 Ca, 10.9 Mg, and 6.6 S. The return, although small,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Litterfall; Litter nutrient content; Nutrient cycling; Tropical rain forest; Restinga forest. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000100002 |
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| DOMINGOS,MARISA; LOPES,MÁRCIA INÊS MARTIN SILVEIRA; STRUFFALDI-DE VUONO,YARA. |
| Several aspects of nutrient cycling were studied at two sites of Atlantic Forest, in São Paulo State, Southeast Brazil (23o46 S; 46o18 W), which exhibited different degrees of forest structure decline caused by the air pollution emitted by the industrial complex of Cubatão, being referred here as the most and least affected sites (MAS and LAS, respectively). These investigations were developed during 1984 - 1986, a period in which the most severe negative effects of air pollution could be observed. Concentrations and amounts of N, P, K, Ca, Mg and S in four ecosystem compartments (leaves, litter layer, soil and roots) and in rainfall, throughfall and litterfall are briefly presented. At each site, the content of mineral elements generally decreased from... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Air pollution effects; Nutrient cycling; Atlantic Forest; Cubatão. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000100009 |
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| Registros recuperados: 56 | |
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