Littérature scientifique sur le sujet « Séquestration du C »
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Articles de revues sur le sujet "Séquestration du C"
Metay, A., B. Mary, D. Arrouays, J. Labreuche, M. Martin, B. Nicolardot et J. C. Germon. « Effets des techniques culturales sans labour sur le stockage de carbone dans le sol en contexte climatique tempéré ». Canadian Journal of Soil Science 89, no 5 (1 novembre 2009) : 623–34. http://dx.doi.org/10.4141/cjss07108.
Texte intégralHessa, Célestin Cokou, Yaya Idrissou, Alassan Seidou Assani, Hilaire Sorébou Sanni Worogo, Brice Gérard Comlan Assogba et Ibrahim Alkoiret Traore. « Quantification des stocks de carbone dans des systèmes agro-sylvopastoraux et sylvopastoraux de deux zones agroécologiques du Bénin ». International Journal of Biological and Chemical Sciences 17, no 6 (18 janvier 2024) : 2225–36. http://dx.doi.org/10.4314/ijbcs.v17i6.8.
Texte intégralThèses sur le sujet "Séquestration du C"
Grandjean, Fabienne. « Mitochondries et résistance pléiotropique des lignées cellulaires K562 résistantes à la doxorubicine : Rôle éventuel des mitochondries dans la séquestration des drogues et modifications de l'expression des gènes codant les sous-unités de la cytochrome c oxydase ». Limoges, 2001. http://www.theses.fr/2001LIMO0009.
Texte intégralRossi, Lorenzo Matteo Walter. « Embankment as a carbon sink : a study on carbon sequestration pathways and mechanisms in topsoil and exposed subsoil ». Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTG083.
Texte intégralCarbon (C) sequestration is receiving increasing scientific and political attention in a framework of greenhouse gasses mitigation. However, geotechnical soils have been neglected for their C sequestration potential, with the global attention focusing on agricultural and natural soils. In the present thesis project we aim to assess the potential of geotechnical embankments as C sink, and, through the study of plant species and soils showing contrasting features, shed light on SOC sequestration mechanisms and the role of the different actor involved. We aim not only to quantify the C gained and lost in soil, but even its origin (fresh new C input or old preexistent C) and how it is partitioned in different C pools characterized by different C stability (quality of stored C). First, we evaluated the C storage in different pools under soil sowed with 12 different herbaceous species in a 10 months experiment. Assessing different root traits allowed understanding the influence of root economic spectrum on C storage. We showed how traits linked to high labile C are linked to a higher C increase in the stable SILT+CLAY pool (<20µm). Root traits related to a low input of recalcitrant, instead, favor accumulation in the unstable POM fraction. Thanks to a 183 days stable isotope labelling experiment (CO2 constantly enriched with 13C) we were able to study the C dynamics in different C pools under two species (L. perenne and M. sativa) sowed on two soil (topsoil, 0-30cm depth and subsoil brought to the surface, 110-140 cm depth) showing contrasting characteristics. We evidenced the great interest of bridging C origin and C pools when studying soil C fates, allowing unveiling processes those more traditional methods would hide. New C and old C showed synergetic covariation, with lower old C losses associated to higher new C inputs. This is in good accordance with the Preferential Substrate Utilization hypothesis (Cheng and Kuzyakov, 2005). The Preferential Substrate Utilization hypothesis was also validated with the study of priming effect and soil respiration, that showed higher plant derived C in respired CO2 when plant C input were high, while increasing old C mineralization when plant C input were low, i.e. in subsoil. We observed significant plant derived new C input in the SILT+CLAY fraction (<20µm, highly stable) supporting evidence of the in vivo entombing effect in the soil Microbial Carbon Pump hypothesis (Liang et al., 2017). The species effect mainly occurred on new C input, but it was overpowered by the soil effect, with lower C storage in low quality soil (low nitrogen and microbial biomass and activity). In general, microbiological conditions were the main driver for new C accumulation and old C loss, and helped to explain why no effect of soil C saturation – a central theory in recent studies on C sequestration - was find in the protected carbon. Such fundamental understanding of plant-soil interactions help us to better optimize soil and vegetation management for road embankment revegetation
Muon, Ratha. « Termite bioturbation in Cambodia - From characterization to application ». Electronic Thesis or Diss., Sorbonne université, 2022. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2022SORUS383.pdf.
Texte intégralSoil biodiversity plays a key role in regulating key ecological functions and in providing essential ecosystem goods and services to human societies. Among soil organisms, termites play a prominent role in tropical soils, as elements of the food web and as ecosystem engineers with effects on soil dynamics and biodiversity at different spatial and temporal scales. Although termite mounds are conspicuous features of the landscapes in the lower Mekong basin, their abundance, properties and utilization by farmers remain unknown. Thus, the aim of this study was to analyze the interactions between termite constructions and farmers in cultivated areas in this region. To this end, we assessed the abundance and properties of two termite constructions (lenticular mounds and mound nests) in paddy fields in Chrey Bak catchment in Cambodia. We showed that termite lenticular mound density reaches ~ 2 mounds ha-1, and that these constructions are likely to find their origin in the building activity of Macrotermes gilvus. We evidenced that termite lenticular mounds and nests can be seen as fertility and biogeochemical hotspots in the landscapes with higher carbon and nutrients contents, and improved soil physical properties (higher clay content, water holding capacity and saturated hydraulic conductivity). Finally, using interviews realized in 13 villages, we showed that termite mounds provide a large number of services to local people, being part of the cultivation practices and contributing to food diversity and health (e.g., utilization of mound soil as amendment, access to medical plants, and lower use of chemical fertilizers and pesticides). To conclude, this interdisciplinary research evidenced the urgent need for a better understanding of the environmental and social impacts of biodiversity, and especially termite activity, and on the driving factors controlling their preservation by farmers