Adresse
Infodoc : Réseau des bibliothèques et centres de documentation d'AgroParisTechFrance
contact
Array ( [TITRE] => <b>Type de document : </b> [TITRE_CLEAN] => Type de document [OPAC_SHOW] => 1 [TYPE] => list [AFF] => Thèse [ID] => 4 [NAME] => cp_typdoc [DATATYPE] => integer [VALUES] => Array ( [0] => 1 ) )
Titre : |
Role of plant rhizosphere across multiple species, grassland management and temperature on microbial communities and long term soil organic matter dynamics
|
Auteur(s) : | Tanvir Shahzad, Auteur |
Type de document : | Thèse |
Sujets : | Relations plante-sol -- Thèses et écrits académiques ; Rhizosphère -- Thèses et écrits académiques ; Sols -- Microbiologie -- Thèses et écrits académiques |
Résumé : |
It is increasingly being recognized that the soil microbes can mineralize recalcitrant soil organic matter (SOM) by using the fresh carbon (C) as a source of energy, a process called priming effect (PE). It has been shown mostly in lab incubations that PE can have important consequences for sequestration of organic C in soils. However, the importance of PE in C and N dynamics of ecosystems remains little known. The soil-plant interactions and rhizospheric processes can modulate the rates of PE and its consequences on C and N dynamics in an ecosystem. The objective of this thesis was to determine the role of PE in the C and N dynamics of permanent grasslands and the modulation of this role in response to management (plant clipping, fertilization) and global warming. Moreover, it was ai[...] It is increasingly being recognized that the soil microbes can mineralize recalcitrant soil organic matter (SOM) by using the fresh carbon (C) as a source of energy, a process called priming effect (PE). It has been shown mostly in lab incubations that PE can have important consequences for sequestration of organic C in soils. However, the importance of PE in C and N dynamics of ecosystems remains little known. The soil-plant interactions and rhizospheric processes can modulate the rates of PE and its consequences on C and N dynamics in an ecosystem. The objective of this thesis was to determine the role of PE in the C and N dynamics of permanent grasslands and the modulation of this role in response to management (plant clipping, fertilization) and global warming. Moreover, it was aimed to identify the microbial groups involved in PE and to unravel the way, e.g. absorption of N, root exudations and litter deposition, by which plant can induce PE. The thesis was based on a new approach allowing continuous dual labelling of multiple grassland plants with 13C- and 14C-CO2. The dual labelling permitted the separation of soil-derived CO2 from plant-derived CO2, the calculation of PE and the determination of mean age of soil-derived CO2-C. Moreover, phospholipids fatty-acids analysis (PLFA) permitted to correlate the variation of PE with changes in microbial community composition [...] |
Editeur(s) : | Paris [France] : AgroParisTech |
Date de publication : | 2012 |
Format : | 1 vol. (175 p.) / tabl., graph. / 30 cm |
Note(s) : |
Notes bibliogr.
|
Langue(s) : | Français |
Lien vers la notice : | https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=161853 |
Exemplaires (1)
Localisation | Emplacement | Pôle | Section | Cote | Support | Disponibilité |
---|---|---|---|---|---|---|
Palaiseau | Magasin - compactus | THE 2012 SHA | Papier | Consultable sur place Exclu du prêt |