Potential C and N Mineralisation of Shoot and Root Residues from Ten Grain Legume Species As Related to their Biochemical Characteristics
2023
Guinet, Maé | Voisin, Anne-Sophie | Nicolardot, Bernard | Agroécologie [Dijon] ; Université de Bourgogne (UB)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Dijon ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) | ANR-13-AGRO-0004,LEGITIMES,Construction et évaluation de scénarios territoriaux d'insertion de légumineuses dans les systèmes de culture pour répondre aux changements globaux(2013) | European Project: 727247,H2020,H2020-SFS-2016-2,SolACE(2017)
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Show more [+] Less [-]English. Our objective was to compare potential C and N mineralisation of root and shoot residues for a wide range of grain legume species. Shootand root residues from ten grain legume crops were collected either from a field experiment or from an outside pot experiment. Residues wereincubated in soil for 112 days at 28°C under non-limiting N conditions. Biochemical characteristics of residues were determined and related to C and N residue mineralisation. Root and shoot residues decomposed rapidly after their incorporation into the soil. After 112 days of incubation, 41.8 to 71.5% of shoots-C and 33.5 to 57.9% of roots-C was mineralised. Most residues induced net N immobilisation at the beginning of incubation, while net N mineralisation occurred later during the incubation period. At the end of incubation -19.6 to 7.8% of shoots-N and -21.7 to 23.0% of roots-N was mineralised. The differences between shoots and roots residues decomposition and N mineralisation were explained by their biochemical characteristics, roots having higher N and lignin content and shoots higher soluble compounds contents, for all species. Differences between legume species in shoot and root N mineralisation were first explained by their C:N ratio and to a lesser extent by the lignin:N ratio and some biochemical fractions (i.e. cellulose, soluble compounds). Finally, these results can be used to parameterize decomposition models and help to predict C and N behaviour of the ten legume crop residues in soil
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