Responses of deciduous broadleaf trees to defoliation in a CO2 enriched atmosphere.
Identifieur interne : 004535 ( Main/Exploration ); précédent : 004534; suivant : 004536Responses of deciduous broadleaf trees to defoliation in a CO2 enriched atmosphere.
Auteurs : John C. Volin [États-Unis] ; Eric L. Kruger ; Richard L. LindrothSource :
- Tree physiology [ 0829-318X ] ; 2002.
Descripteurs français
- KwdFr :
- Acer (croissance et développement), Acer (physiologie), Arbres (croissance et développement), Arbres (physiologie), Azote (analyse), Biomasse (MeSH), Dioxyde de carbone (physiologie), Feuilles de plante (composition chimique), Feuilles de plante (physiologie), Glucides (analyse), Photosynthèse (physiologie), Plant (croissance et développement), Populus (croissance et développement), Populus (physiologie).
- MESH :
- analyse : Azote, Glucides.
- composition chimique : Feuilles de plante.
- croissance et développement : Acer, Arbres, Plant, Populus.
- physiologie : Acer, Arbres, Dioxyde de carbone, Feuilles de plante, Photosynthèse, Populus.
- Biomasse.
English descriptors
- KwdEn :
- Acer (growth & development), Acer (physiology), Biomass (MeSH), Carbohydrates (analysis), Carbon Dioxide (physiology), Nitrogen (analysis), Photosynthesis (physiology), Plant Leaves (chemistry), Plant Leaves (physiology), Populus (growth & development), Populus (physiology), Seedlings (growth & development), Trees (growth & development), Trees (physiology).
- MESH :
- chemical , analysis : Carbohydrates, Nitrogen.
- chemistry : Plant Leaves.
- growth & development : Acer, Populus, Seedlings, Trees.
- physiology : Acer, Carbon Dioxide, Photosynthesis, Plant Leaves, Populus, Trees.
- Biomass.
Abstract
Relatively little is known about the implications of atmospheric CO2 enrichment for tree responses to biotic disturbances such as folivory. We examined the combined effects of elevated CO2 concentration ([CO2]) and defoliation on growth and physiology of sugar maple (Acer saccharum Marsh.) and trembling aspen (Populus tremuloides Michx.). Seedlings were planted in the ground in eight open-top chambers. Four chambers were ventilated with CO2-enriched air (ambient + 283 micromol mol-1) and four chambers were supplied with ambient air. After 6 weeks of growth, half of the leaf area was removed on a subset of seedlings of each species in each CO2 treatment. We monitored subsequent biomass gain and allocation, along with leaf gas exchange and chemistry. Defoliation did not significantly affect final seedling biomass in either species or CO2 treatment. Growth recovery following defoliation was associated with increased allocation to leaf mass in maple and a slight enhancement of mean photosynthesis in aspen. Elevated [CO2] did not significantly affect aspen growth, and the observed stimulation of maple growth was significant only in mid-season. Correspondingly, simulated responses of whole-tree photosynthesis to elevated [CO2] were constrained by a decrease in photosynthetic capacity in maple, and were partially offset by reductions in specific leaf area and biomass allocation to foliage in aspen. There was a significant interaction between [CO2] and defoliation on only a few of the measured traits. Thus, the data do not support the hypothesis that atmospheric CO2 enrichment will substantially alter tree responses to folivory. However, our findings do provide further indication that regeneration-stage growth rates of certain temperate tree species may respond only moderately to a near doubling of atmospheric [CO2].
DOI: 10.1093/treephys/22.7.435
PubMed: 11986047
Affiliations:
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Kruger</name></author><author><name sortKey="Lindroth, Richard L" sort="Lindroth, Richard L" uniqKey="Lindroth R" first="Richard L" last="Lindroth">Richard L. 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We examined the combined effects of elevated CO2 concentration ([CO2]) and defoliation on growth and physiology of sugar maple (Acer saccharum Marsh.) and trembling aspen (Populus tremuloides Michx.). Seedlings were planted in the ground in eight open-top chambers. Four chambers were ventilated with CO2-enriched air (ambient + 283 micromol mol-1) and four chambers were supplied with ambient air. After 6 weeks of growth, half of the leaf area was removed on a subset of seedlings of each species in each CO2 treatment. We monitored subsequent biomass gain and allocation, along with leaf gas exchange and chemistry. Defoliation did not significantly affect final seedling biomass in either species or CO2 treatment. Growth recovery following defoliation was associated with increased allocation to leaf mass in maple and a slight enhancement of mean photosynthesis in aspen. Elevated [CO2] did not significantly affect aspen growth, and the observed stimulation of maple growth was significant only in mid-season. Correspondingly, simulated responses of whole-tree photosynthesis to elevated [CO2] were constrained by a decrease in photosynthetic capacity in maple, and were partially offset by reductions in specific leaf area and biomass allocation to foliage in aspen. There was a significant interaction between [CO2] and defoliation on only a few of the measured traits. Thus, the data do not support the hypothesis that atmospheric CO2 enrichment will substantially alter tree responses to folivory. However, our findings do provide further indication that regeneration-stage growth rates of certain temperate tree species may respond only moderately to a near doubling of atmospheric [CO2].</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">11986047</PMID><DateCompleted><Year>2003</Year><Month>03</Month><Day>10</Day></DateCompleted><DateRevised><Year>2019</Year><Month>05</Month><Day>13</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0829-318X</ISSN><JournalIssue CitedMedium="Print"><Volume>22</Volume><Issue>7</Issue><PubDate><Year>2002</Year><Month>May</Month></PubDate></JournalIssue><Title>Tree physiology</Title><ISOAbbreviation>Tree Physiol</ISOAbbreviation></Journal><ArticleTitle>Responses of deciduous broadleaf trees to defoliation in a CO2 enriched atmosphere.</ArticleTitle><Pagination><MedlinePgn>435-48</MedlinePgn></Pagination><Abstract><AbstractText>Relatively little is known about the implications of atmospheric CO2 enrichment for tree responses to biotic disturbances such as folivory. We examined the combined effects of elevated CO2 concentration ([CO2]) and defoliation on growth and physiology of sugar maple (Acer saccharum Marsh.) and trembling aspen (Populus tremuloides Michx.). Seedlings were planted in the ground in eight open-top chambers. Four chambers were ventilated with CO2-enriched air (ambient + 283 micromol mol-1) and four chambers were supplied with ambient air. After 6 weeks of growth, half of the leaf area was removed on a subset of seedlings of each species in each CO2 treatment. We monitored subsequent biomass gain and allocation, along with leaf gas exchange and chemistry. Defoliation did not significantly affect final seedling biomass in either species or CO2 treatment. Growth recovery following defoliation was associated with increased allocation to leaf mass in maple and a slight enhancement of mean photosynthesis in aspen. Elevated [CO2] did not significantly affect aspen growth, and the observed stimulation of maple growth was significant only in mid-season. Correspondingly, simulated responses of whole-tree photosynthesis to elevated [CO2] were constrained by a decrease in photosynthetic capacity in maple, and were partially offset by reductions in specific leaf area and biomass allocation to foliage in aspen. There was a significant interaction between [CO2] and defoliation on only a few of the measured traits. Thus, the data do not support the hypothesis that atmospheric CO2 enrichment will substantially alter tree responses to folivory. 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Kruger</name><name sortKey="Lindroth, Richard L" sort="Lindroth, Richard L" uniqKey="Lindroth R" first="Richard L" last="Lindroth">Richard L. Lindroth</name></noCountry><country name="États-Unis"><region name="Floride"><name sortKey="Volin, John C" sort="Volin, John C" uniqKey="Volin J" first="John C" last="Volin">John C. Volin</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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