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Impact of Oyster Farming on Diagenetic Processes and the Phosphorus Cycle in Two Estuaries (Britanny, France) ArchiMer
Andrieux, Francoise; Azandegbe, Afi; Caradec, Florian; Philippon, Xavier; Kerouel, Roger; Youenou, Agnes; Nicolas, Jean-louis.
This study aims to compare the impact of oyster cultures on diagenetic processes and the phosphorus cycle in the sediments of the Aber Benoît and the Rivière d’Auray, estuary of Brittany, France. Our results showed clear evidence of the seasonal impact of oyster cultures on sediment characteristics (grain size, organic matter parameters), and the phosphorus cycle, especially in the Aber Benoît. At this site, seasonal variations of sulfide and Fe concentrations in pore waters, as well as Fe-P concentrations in the solid-phase highlighted a shift from a system governed by iron reduction (Reference) to a system governed by sulphate reduction (Beneath Oyster). This could be partly explained by the increase in labile organic matter (ie, biodeposits) beneath...
Tipo: Text Palavras-chave: Sediment; Phosphorus; Sulfide; Dissolved Fe/P ratios; Labile organic matter; Oyster cultures.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00209/32003/30441.pdf
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Protocoles d'extraction chimique de la matière organique particulaire : application au domaine estuarien ArchiMer
Etcheber, H.; Heral, Maurice; Relaxans, J. C..
There are several bio geochemical methods of studying particulate organic matter (0,45-300 µm). The main techniques employed are described ; special attention has been paid to extractive processes (chemical attack of samples and study of extracted fraction). Although these techniques are simple, various difficulties can arise : results obtained by various authors cannot be compared when techniques used differ. Furthermore the environmental interpretation of extracted functions is not always very clear. Extractive methods, which most often use harsh chemical extractants, do not provide accurate measurements of the importance of labile organic fraction. We propose therefore a series of chemical attacks of increasing strength and a correlation of results...
Tipo: Text Palavras-chave: EstUARIES; Labile organic matter; Chemical extractive methods; Particulate organic matter; Extuaires; Matière organique labile; Méthode d'extraction chimique; Matière organique particulaire.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/publication-2957.pdf
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Relationships between labile soil organic carbon fractions under different soil management systems. Repositório Alice
SOUZA, G. P. de; FIGUEIREDO, C. C. de; SOUSA, D. M. G. de.
ABSTRACT: The study of labile carbon fractions (LCF) provides an understanding of the behavior of soil organic matter (SOM) under different soil management systems and cover crops. The aim of this study was to assess the effect of different soil management systems with respect to tillage, cover crop and phosphate fertilization on the amount of the LCF of SOM. Treatments consisted of conventional tillage (CT) and no-tillage (NT) with millet as the cover crop and a no-tillage system with velvet bean at two phosphorus dosages. Soil samples were collected and analyzed for organic carbon (OC), C oxidizable by KMnO4 (C-KMnO4), particulate OC (POC), microbial biomass carbon and light SOM in the 0.0-0.05, 0.05-0.10 and 0.10-0.20 m soil layers. The Carbon...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Labile organic matter; Soil organic matter; Phosphorus fertilization; Matéria orgânica instável; Materia orgânica; Solo; Fertilidade do solo; Fósforo.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1054545
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Relationships between labile soil organic carbon fractions under different soil management systems Scientia Agricola
Souza,Géssica Pereira de; Figueiredo,Cícero Célio de; Sousa,Djalma Martinhão Gomes de.
ABSTRACT The study of labile carbon fractions (LCF) provides an understanding of the behavior of soil organic matter (SOM) under different soil management systems and cover crops. The aim of this study was to assess the effect of different soil management systems with respect to tillage, cover crop and phosphate fertilization on the amount of the LCF of SOM. Treatments consisted of conventional tillage (CT) and no-tillage (NT) with millet as the cover crop and a no-tillage system with velvet bean at two phosphorus dosages. Soil samples were collected and analyzed for organic carbon (OC), C oxidizable by KMnO4 (C-KMnO4), particulate OC (POC), microbial biomass carbon and light SOM in the 0.0-0.05, 0.05-0.10 and 0.10-0.20 m soil layers. The Carbon Management...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Labile organic matter; Soil organic matter; Phosphorus fertilization.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600535
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