AustralieFrV1, Main, Exploration, bibRecord, 00C290

Effects of elevated [CO2] on forest growth and carbon storage : a modelling analysis of the consequences of changes in litter quality/quantity and root exudation

Identifieur interne : 00C290 ( Main/Exploration ); précédent : 00C289; suivant : 00C291

Effects of elevated [CO2] on forest growth and carbon storage : a modelling analysis of the consequences of changes in litter quality/quantity and root exudation

Auteurs : Ross E. Mcmurtrie [Australie] ; Roderick C. Dewar [France] ; Belinda E. Medlyn [Royaume-Uni] ; Mark P. Jeffreys [Australie]

Source :

Plant and soil [ 0032-079X ] ; 2000.

RBID : Pascal:01-0002968

Descripteurs français

Pascal (Inist)
- Enrichissement milieu, Croissance, Forêt, Stockage, Modélisation, Qualité, Litière, Exsudat, Racine, Carbone dioxyde, Azote, Biodisponibilité, Cycle azote, Cycle carbone, Modèle mathématique.
Wicri :
- topic : Forêt, Stockage, Azote.

English descriptors

KwdEn :
- Bioavailability, Carbon cycle, Carbon dioxide, Exudate, Forests, Growth, Litter, Mathematical model, Medium enrichment, Modeling, Nitrogen, Nitrogen cycle, Quality, Root, Storage.

Abstract

Many researchers have proposed that the stimulus of plant growth under elevated [CO₂] observed in short-term experiments will be moderated in the longer term by a reduction in soil nitrogen (N) availability linked to decreased litter quality and/or increased litter production. However, these negative feedbacks may be offset to some extent by a stimulus in N fixation linked to increased root exudation. The aim of this modelling study is to examine how changes in litter quality/quantity and root exudation -- if they occur - will affect the CO₂ responses of net primary productivity and ecosystem carbon (C) storage on different timescales. We apply a model of C and N cycling in forest ecosystems (G'DAY) to stands of Norway spruce (Picea abies, L. Cast) growing at a N-limited experimental site at Flakaliden, Sweden, and draw the following conclusions: (1) in the absence of changes in litter quality and root exudation, the short-term CO₂ stimulus of litter quantity leads to only a minimal CO₂ stimulus of productivity or C storage in the medium term ( 20 years) and long term ( 200 years), because of constraints on soil N availability; (2) increasing plant nitrogen use efficiency (via a decrease in the N:C ratio of new litter) makes little impact on these results; (3) a significant CO₂ response in the medium term requires a substantial decrease in the N:C ratio of older litter, when it is approaching stabilisation as soil organic matter, although the long-term CO₂ response remains small; and (4) an increase in N fixation leads to a small effect on productivity in the short term, but a very large effect on both productivity and C storage in the long term. These results suggest that soil N constraints on the long-term CO₂-fertilisation effect can be overcome to a significant extent only by increases in N acquisition, although only modest increases may be required.

Affiliations:

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Le document en format XML

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<front><div type="abstract" xml:lang="en">Many researchers have proposed that the stimulus of plant growth under elevated [CO<sub>2</sub>
] observed in short-term experiments will be moderated in the longer term by a reduction in soil nitrogen (N) availability linked to decreased litter quality and/or increased litter production. However, these negative feedbacks may be offset to some extent by a stimulus in N fixation linked to increased root exudation. The aim of this modelling study is to examine how changes in litter quality/quantity and root exudation -- if they occur - will affect the CO<sub>2</sub>
 responses of net primary productivity and ecosystem carbon (C) storage on different timescales. We apply a model of C and N cycling in forest ecosystems (G'DAY) to stands of Norway spruce (Picea abies, L. Cast) growing at a N-limited experimental site at Flakaliden, Sweden, and draw the following conclusions: (1) in the absence of changes in litter quality and root exudation, the short-term CO<sub>2</sub>
 stimulus of litter quantity leads to only a minimal CO<sub>2</sub>
 stimulus of productivity or C storage in the medium term ( 20 years) and long term ( 200 years), because of constraints on soil N availability; (2) increasing plant nitrogen use efficiency (via a decrease in the N:C ratio of new litter) makes little impact on these results; (3) a significant CO<sub>2</sub>
 response in the medium term requires a substantial decrease in the N:C ratio of older litter, when it is approaching stabilisation as soil organic matter, although the long-term CO<sub>2</sub>
 response remains small; and (4) an increase in N fixation leads to a small effect on productivity in the short term, but a very large effect on both productivity and C storage in the long term. These results suggest that soil N constraints on the long-term CO<sub>2</sub>
-fertilisation effect can be overcome to a significant extent only by increases in N acquisition, although only modest increases may be required.</div>
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Effects of elevated [CO2] on forest growth and carbon storage : a modelling analysis of the consequences of changes in litter quality/quantity and root exudation

Effects of elevated [CO2] on forest growth and carbon storage : a modelling analysis of the consequences of changes in litter quality/quantity and root exudation

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri