Horizon / Plein textes La base de ressources documentaires de l'IRD

IRD

Publications des scientifiques de l'IRD

Trap Jean, Apka-Vinceslas M., Margerie P., Boudsocq S., Richard F., Decaëns T., Aubert M. (2017). Slow decomposition of leaf litter from mature Fagus sylvatica trees promotes offspring nitrogen acquisition by interacting with ectomycorrhizal fungi. Journal of Ecology, 105 (2), 528-539. ISSN 0022-0477

Accès réservé (Intranet IRD) Document en accès réservé (Intranet IRD)

Lien direct chez l'éditeur doi:10.1111/1365-2745.12665

Titre
Slow decomposition of leaf litter from mature Fagus sylvatica trees promotes offspring nitrogen acquisition by interacting with ectomycorrhizal fungi
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000394587000022
AuteursTrap Jean, Apka-Vinceslas M., Margerie P., Boudsocq S., Richard F., Decaëns T., Aubert M.
SourceJournal of Ecology, 2017, 105 (2), p. 528-539. ISSN 0022-0477
RésuméLeaf litter chemistry and ectomycorrhizal (ECM) fungi are key drivers of the below-ground nitrogen (N) cycling within forest ecosystems. Their combined effects on litter decomposition and N competition between microbial decomposers and plants are still uncertain. We conducted a glasshouse microcosm experiment with low or high ECM-colonized beech (Fagus sylvatica) saplings, growing with litter collected from old or young beech trees growing on the same loamy soil. After 6months of growth, we investigated litter decomposition rates, microbial respiration and the N pools within leaf litter, soil (different pools), microbial and plant shoot biomass. We found that the mass loss of the litter from young trees was always higher than the litter from the mature trees. The microbial biomass N per unit soil carbon was low when the litter, especially from mature trees, was added, suggesting that the litter provided recalcitrant compounds and limited soil microbial activity. In contrast to the Gadgil effect' hypothesis, the high ECM-colonized roots increased the litter decomposition rate and N immobilization in poorly decomposable litter in comparison with the litter incubated with the low ECM-colonized roots. Finally, the high ECM-colonized plants that received the poorly decomposable leaf litter exhibited the highest shoot N amount and biomass and were associated with the lowest microbial biomass N. Two-way anovas revealed that litter and ECM fungi occurrence together impacted final particulate organic N, microbial biomass N, the amount of shoot N and shoot biomass. Four N pools are key drivers of microbial biomass N and shoot N: particulate organic N, total N, soil ammonium concentration and litter N concentration. Synthesis. Our results support the hypothesis that poorly decomposable leaf litter produced by mature beech trees and ECM fungi together decrease microbial N immobilization but increase tree N acquisition. Increasing N retention within the recalcitrant N forms in soil was identified as a key mechanism by which beech alters soil N cycling with potential positive feedbacks on its acquisition by the plant. Our result emphasizes the importance of considering within-species litter-trait variability in litter decomposition.
Plan de classementBiologie du sol [074] ; Etudes, transformation, conservation du milieu naturel [082]
LocalisationFonds IRD [F B010070537]
Identifiant IRDfdi:010070537
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010070537

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL


Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Nouméa

Papeete

Niamey

Ouagadougou

Tunis

La Paz

Quito