Belowground carbon cycling in a humid tropical forest decreases with fertilization.
Identifieur interne : 003759 ( Main/Curation ); précédent : 003758; suivant : 003760Belowground carbon cycling in a humid tropical forest decreases with fertilization.
Auteurs : Christian P. Giardina [États-Unis] ; Dan Binkley ; Michael G. Ryan ; James H. Fownes ; Randy S. SenockSource :
- Oecologia [ 0029-8549 ] ; 2004.
Descripteurs français
- KwdFr :
- MESH :
- composition chimique : Feuilles de plante.
- physiologie : Arbres, Carbone.
- Climat tropical, Hawaï, Humidité, Isotopes du carbone, Modèles biologiques, Phénomènes physiologiques des plantes, Sol.
English descriptors
- KwdEn :
- MESH :
- chemical , physiology : Carbon.
- chemical : Carbon Isotopes, Soil.
- chemistry : Plant Leaves.
- physiology : Trees.
- Hawaii, Humidity, Models, Biological, Plant Physiological Phenomena, Tropical Climate.
Abstract
Only a small fraction of the carbon (C) allocated belowground by trees is retained by soils in long-lived, decay-resistant forms, yet because of the large magnitude of terrestrial primary productivity, even small changes in C allocation or retention can alter terrestrial C storage. The humid tropics exert a disproportionately large influence over terrestrial C storage, but C allocation and belowground retention in these ecosystems remain poorly quantified. Using mass balance and 13C isotope methods, we examined the effects of afforestation and fertilization, two land-use changes of large-scale importance, on belowground C cycling at a humid tropical site in Hawaii. Here we report that in unfertilized plots, 80% of the C allocated belowground by trees to roots and mycorrhizae was returned to the atmosphere within 1 year; 9% of the belowground C flux was retained in coarse roots and 11% was retained as new soil C. The gains in new soil C were offset entirely by losses of old soil C. Further, while fertilization early in stand development increased C storage in the litter layer and in coarse roots, it reduced by 22% the flux of C moving through roots and mycorrhizae into mineral soils. Because soil C formation rates related strongly to rhizosphere C flux, fertilization may reduce an already limited capacity of these forests to sequester decay-resistant soil C.
DOI: 10.1007/s00442-004-1552-0
PubMed: 15071736
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pubmed:15071736Le document en format XML
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Carbon (physiology)</term>
<term>Carbon Isotopes (MeSH)</term>
<term>Hawaii (MeSH)</term>
<term>Humidity (MeSH)</term>
<term>Models, Biological (MeSH)</term>
<term>Plant Leaves (chemistry)</term>
<term>Plant Physiological Phenomena (MeSH)</term>
<term>Soil (MeSH)</term>
<term>Trees (physiology)</term>
<term>Tropical Climate (MeSH)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><term>Arbres (physiologie)</term>
<term>Carbone (physiologie)</term>
<term>Climat tropical (MeSH)</term>
<term>Feuilles de plante (composition chimique)</term>
<term>Hawaï (MeSH)</term>
<term>Humidité (MeSH)</term>
<term>Isotopes du carbone (MeSH)</term>
<term>Modèles biologiques (MeSH)</term>
<term>Phénomènes physiologiques des plantes (MeSH)</term>
<term>Sol (MeSH)</term>
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<keywords scheme="MESH" type="chemical" qualifier="physiology" xml:lang="en"><term>Carbon</term>
</keywords>
<keywords scheme="MESH" type="chemical" xml:lang="en"><term>Carbon Isotopes</term>
<term>Soil</term>
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<keywords scheme="MESH" qualifier="chemistry" xml:lang="en"><term>Plant Leaves</term>
</keywords>
<keywords scheme="MESH" qualifier="composition chimique" xml:lang="fr"><term>Feuilles de plante</term>
</keywords>
<keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Arbres</term>
<term>Carbone</term>
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<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Trees</term>
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<keywords scheme="MESH" xml:lang="en"><term>Hawaii</term>
<term>Humidity</term>
<term>Models, Biological</term>
<term>Plant Physiological Phenomena</term>
<term>Tropical Climate</term>
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<keywords scheme="MESH" xml:lang="fr"><term>Climat tropical</term>
<term>Hawaï</term>
<term>Humidité</term>
<term>Isotopes du carbone</term>
<term>Modèles biologiques</term>
<term>Phénomènes physiologiques des plantes</term>
<term>Sol</term>
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<front><div type="abstract" xml:lang="en">Only a small fraction of the carbon (C) allocated belowground by trees is retained by soils in long-lived, decay-resistant forms, yet because of the large magnitude of terrestrial primary productivity, even small changes in C allocation or retention can alter terrestrial C storage. The humid tropics exert a disproportionately large influence over terrestrial C storage, but C allocation and belowground retention in these ecosystems remain poorly quantified. Using mass balance and 13C isotope methods, we examined the effects of afforestation and fertilization, two land-use changes of large-scale importance, on belowground C cycling at a humid tropical site in Hawaii. Here we report that in unfertilized plots, 80% of the C allocated belowground by trees to roots and mycorrhizae was returned to the atmosphere within 1 year; 9% of the belowground C flux was retained in coarse roots and 11% was retained as new soil C. The gains in new soil C were offset entirely by losses of old soil C. Further, while fertilization early in stand development increased C storage in the litter layer and in coarse roots, it reduced by 22% the flux of C moving through roots and mycorrhizae into mineral soils. Because soil C formation rates related strongly to rhizosphere C flux, fertilization may reduce an already limited capacity of these forests to sequester decay-resistant soil C.</div>
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<Abstract><AbstractText>Only a small fraction of the carbon (C) allocated belowground by trees is retained by soils in long-lived, decay-resistant forms, yet because of the large magnitude of terrestrial primary productivity, even small changes in C allocation or retention can alter terrestrial C storage. The humid tropics exert a disproportionately large influence over terrestrial C storage, but C allocation and belowground retention in these ecosystems remain poorly quantified. Using mass balance and 13C isotope methods, we examined the effects of afforestation and fertilization, two land-use changes of large-scale importance, on belowground C cycling at a humid tropical site in Hawaii. Here we report that in unfertilized plots, 80% of the C allocated belowground by trees to roots and mycorrhizae was returned to the atmosphere within 1 year; 9% of the belowground C flux was retained in coarse roots and 11% was retained as new soil C. The gains in new soil C were offset entirely by losses of old soil C. Further, while fertilization early in stand development increased C storage in the litter layer and in coarse roots, it reduced by 22% the flux of C moving through roots and mycorrhizae into mineral soils. Because soil C formation rates related strongly to rhizosphere C flux, fertilization may reduce an already limited capacity of these forests to sequester decay-resistant soil C.</AbstractText>
<CopyrightInformation>Copyright 2004 Springer-Verlag</CopyrightInformation>
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