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| Registros recuperados: 43 | |
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| Koutika, L.S.; Chone, T.; Andreux, F.; Cerri, C.C.. |
| The topsoils of two sites, comprising natural forest and 4- and 20-year-old pastures, respectively, were selected in Rondônia to evaluate the changes of soil organic matter due to pasture establishment. These changes were evaluated by measuring the proportions of the C and N associated with clay and silt fractions, and by the C decomposition (CD) rate of the whole topsoils and their size fractions. The topsoils studied had large proportions of C and N associated with fine fractions, especially with clay fractions. The CD rate of the silt fractions was higher than that of the clay fractions under the two forest topsoils and under the 20-year-old pasture. The CD rate of the silt fractions under forest vegetation at each site was significantly higher than... |
| Tipo: Journal Article |
Palavras-chave: DECOMPOSITION; TOPSOL; SCIENCES DU SOL. |
| Ano: 2000 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0300033138095942&uri=/notices/prodinra1/2010/12/ |
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| Koutika, L.S.; Andreux, F.; Hassink, J.; Chone, T.; Cerri, C.C.. |
| In topsoils under forest and 7-, 12- and 17-year-old pastures, organic matter was characterized by analysing C and N distribution in particle-size fractions, the C decomposition rates of soil and particle-size fractions and by employing density-fractionation of macro-organic matter (>150 μm). The C and N associated with clay fractions increased with increasing age of pasture. The weight (%) of macro-organic matter and its heavy fractions (>1.37 g cm–3) also increased with increasing age of pasture. However, in a long-term incubation (100 days), these changes seemed to involve an increase in the C decomposition rate in the topsoil of the oldest pasture. Using the C decomposition rates of particle-size fractions, it appeared that silt and clay... |
| Tipo: Journal Article |
Palavras-chave: SCIENCES DU SOL; AMAZONIE; TOPSOL; FORET PLUVIALE; MATIERE ORGANIQUE DU SOL; DECOMPOSITION; FRACTION ARGILEUSE; TAILLE DES PARTICULES. |
| Ano: 1999 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0300033143095947&uri=/notices/prodinra1/2010/12/ |
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| Poi de Neiff, A.; Bruquetas de Zozaya, Y.. |
| La colonisation de #Polygonum acuminatum$ et de #Panicum elephantipes$ en décomposition a été étudié dans un bras secondaire du Rio Parana qui pénètre dans l'île de Choui. La perte en poids sec a été suivie sous deux mètres d'eau par la technique du sac en filet. L'abondance des invertébrés qui ont colonisé le substrat a été exprimée par sac et par g de poids sec. La décomposition calculée sur 50 jours a été respectivement de 0,017 j-1 pour #P. acuminatum$ et de 0,085 j-1 pour #P. elephantipes$. La densité des invertébrés a augmenté au fur et à mesure de la décomposition, avec une corrélation négative entre le poids sec restant de litière et le nombre d'invertébrés par g de litière. Une diminution de la densité a été observée après 24 jours d'incubation... |
| Tipo: Text |
Palavras-chave: INVERTEBRE AQUATIQUE; EAU DOUCE; DENSITE DE POPULATION; MACROPHYTE; DECOMPOSITION; RELATION ESPECE ENVIRONNEMENT. |
| Ano: 1991 |
URL: http://www.documentation.ird.fr/hor/fdi:35856 |
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| Pernin, C.; Ambrosi, J. P.; Cortet, J.; Joffre, R;; Le Petit, J.; Tabone, E.; Torre, F.; Krogh, P. H.. |
| A laboratory mesocosm experiment was performed to study the effects of copper-enriched sewage sludge application on a mesofauna community. For 12 weeks, characteristics and changes in this defined and artificial mesofauna community structure were monitored as well as the dynamics of leaf litter decomposition. The mesofauna community comprised six species of Collembola (Folsomia fimetaria, Isotomurus prasinus, Lepidocyrtus cyaneus, Mesaphorura macrochaeta, Parisotoma notabilis, Protaphorura armata), two species of acari Oribatida (Achipteria coleoptrata, Adoristes sp.), one species of acari Gamasida (Hypoaspis aculeifer) and one species of enchytraeid (Enchytraeus crypticus). Three treatments included the addition of 22 g dry weight (DW) sludge spiked with... |
| Tipo: Journal Article |
Palavras-chave: CUIVRE; FAUNE DU SOL; BOUE RESIDUAIRE; TOXICITE COPPER; DECOMPOSITION; MESOCOSM; MESOFAUNA; SEWAGE SLUDGE. |
| Ano: 2006 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20077eccf1be&uri=/notices/prodinra1/2010/12/ |
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| Koutika, L.S.; Choné, T.; Andreux, F.; Burtin, G.; Cerri, C.C.. |
| The influence of texture and local climate, especially precipitation, on C decomposition was evaluated in topsoils under forest and pastures at different sites located in the western, central, and eastern Brazilian Amazon Basin. Independent of the geographical location and vegetation cover, C decomposition was lower in topsoils of fine texture with a sand/clay ratio of less than 1, compared to topsoils of coarse a texture with a sand/clay ratio ranging from 2 to 8. In the former, the low sand/clay ratio appears to reduce C decomposition. In the latter, besides the effect of the high sand/clay ratio, the local climate, especially the annual precipitation, seems to play an important role in controlling C decomposition. |
| Tipo: Journal Article |
Palavras-chave: PLUVIOMETRIE; SCIENCES DU SOL; AMAZONIE; DECOMPOSITION; MATIERE ORGANIQUE DU SOL; TOPSOL; TEXTURE DU SOL; FRACTION ARGILEUSE. |
| Ano: 1999 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0300033151096109&uri=/notices/prodinra1/2010/12/ |
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| Registros recuperados: 43 | |
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