Arbuscular mycorrhizal mycelial respiration in a moist tropical forest.
Identifieur interne : 002792 ( Main/Exploration ); précédent : 002791; suivant : 002793Arbuscular mycorrhizal mycelial respiration in a moist tropical forest.
Auteurs : Andrew T. Nottingham [Royaume-Uni] ; Benjamin L. Turner ; Klaus Winter ; Marcel G A. Van Der Heijden ; Edmund V J. TannerSource :
- The New phytologist [ 1469-8137 ] ; 2010.
Descripteurs français
- KwdFr :
- Arbres (microbiologie), Azote (métabolisme), Aérobiose (MeSH), Carbone (métabolisme), Climat tropical (MeSH), Concentration en ions d'hydrogène (MeSH), Dioxyde de carbone (métabolisme), Eau (physiologie), Mycelium (physiologie), Mycorhizes (physiologie), Phosphore (métabolisme), Racines de plante (microbiologie), Sol (analyse), Température (MeSH).
- MESH :
- analyse : Sol.
- microbiologie : Arbres, Racines de plante.
- métabolisme : Azote, Carbone, Dioxyde de carbone, Phosphore.
- physiologie : Eau, Mycelium, Mycorhizes.
- Aérobiose, Climat tropical, Concentration en ions d'hydrogène, Température.
English descriptors
- KwdEn :
- Aerobiosis (MeSH), Carbon (metabolism), Carbon Dioxide (metabolism), Hydrogen-Ion Concentration (MeSH), Mycelium (physiology), Mycorrhizae (physiology), Nitrogen (metabolism), Phosphorus (metabolism), Plant Roots (microbiology), Soil (analysis), Temperature (MeSH), Trees (microbiology), Tropical Climate (MeSH), Water (physiology).
- MESH :
- chemical , analysis : Soil.
- chemical , metabolism : Carbon, Carbon Dioxide, Nitrogen, Phosphorus.
- microbiology : Plant Roots, Trees.
- physiology : Mycelium, Mycorrhizae, Water.
- Aerobiosis, Hydrogen-Ion Concentration, Temperature, Tropical Climate.
Abstract
*Arbuscular mycorrhizal fungi (AMF) are widespread in tropical forests and represent a major sink of photosynthate, yet their contribution to soil respiration in such ecosystems remains unknown. *Using in-growth mesocosms we measured AMF mycelial respiration in two separate experiments: (1) an experiment in a semi-evergreen moist tropical forest, and (2) an experiment with 6-m-tall Pseudobombax septenatum in 4.5-m(3) containers, for which we also determined the dependence of AMF mycelial respiration on the supply of carbon from the plant using girdling and root-cutting treatments. *In the forest, AMF mycelia respired carbon at a rate of 1.4 t ha(-1) yr(-1), which accounted for 14 +/- 6% of total soil respiration and 26 +/- 12% of root-derived respiration. For P. septenatum, 40 +/- 6% of root-derived respiration originated from AMF mycelia and carbon was respired < 4 h after its supply from roots. *We conclude that arbuscular mycorrhizal mycelial respiration can be substantial in lowland tropical forests. As it is highly dependent on the recent supply of carbon from roots, a function of aboveground fixation, AMF mycelial respiration is therefore an important pathway of carbon flux from tropical forest trees to the atmosphere.
DOI: 10.1111/j.1469-8137.2010.03226.x
PubMed: 20345636
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<term>Hydrogen-Ion Concentration (MeSH)</term>
<term>Mycelium (physiology)</term>
<term>Mycorrhizae (physiology)</term>
<term>Nitrogen (metabolism)</term>
<term>Phosphorus (metabolism)</term>
<term>Plant Roots (microbiology)</term>
<term>Soil (analysis)</term>
<term>Temperature (MeSH)</term>
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<keywords scheme="KwdFr" xml:lang="fr"><term>Arbres (microbiologie)</term>
<term>Azote (métabolisme)</term>
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<term>Climat tropical (MeSH)</term>
<term>Concentration en ions d'hydrogène (MeSH)</term>
<term>Dioxyde de carbone (métabolisme)</term>
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<term>Mycelium (physiologie)</term>
<term>Mycorhizes (physiologie)</term>
<term>Phosphore (métabolisme)</term>
<term>Racines de plante (microbiologie)</term>
<term>Sol (analyse)</term>
<term>Température (MeSH)</term>
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<term>Climat tropical</term>
<term>Concentration en ions d'hydrogène</term>
<term>Température</term>
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<front><div type="abstract" xml:lang="en">*Arbuscular mycorrhizal fungi (AMF) are widespread in tropical forests and represent a major sink of photosynthate, yet their contribution to soil respiration in such ecosystems remains unknown. *Using in-growth mesocosms we measured AMF mycelial respiration in two separate experiments: (1) an experiment in a semi-evergreen moist tropical forest, and (2) an experiment with 6-m-tall Pseudobombax septenatum in 4.5-m(3) containers, for which we also determined the dependence of AMF mycelial respiration on the supply of carbon from the plant using girdling and root-cutting treatments. *In the forest, AMF mycelia respired carbon at a rate of 1.4 t ha(-1) yr(-1), which accounted for 14 +/- 6% of total soil respiration and 26 +/- 12% of root-derived respiration. For P. septenatum, 40 +/- 6% of root-derived respiration originated from AMF mycelia and carbon was respired < 4 h after its supply from roots. *We conclude that arbuscular mycorrhizal mycelial respiration can be substantial in lowland tropical forests. As it is highly dependent on the recent supply of carbon from roots, a function of aboveground fixation, AMF mycelial respiration is therefore an important pathway of carbon flux from tropical forest trees to the atmosphere.</div>
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