Photosynthetic responses to understory shade and elevated carbon dioxide concentration in four northern hardwood tree species.
Seedling responses to elevated atmospheric CO(2) concentration ([CO(2)]) and solar irradiance were measured over two growing seasons in shade-tolerant Acer saccharum Marsh. and Fagus grandifolia J.F. Ehrh. and shade-intolerant Prunus serotina, a J.F. Ehrh. and Betula papyrifera Marsh. Seedlings were...
| Main Authors: | , , |
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| Format: | Journal Article |
| Language: | English |
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OXFORD UNIV PRESS
2006
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| Online Access: | http://hdl.handle.net/20.500.11937/77908 |
| _version_ | 1848763919110242304 |
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| author | Sefcik, Lesley Zak, D.R. Ellsworth, D.S. |
| author_facet | Sefcik, Lesley Zak, D.R. Ellsworth, D.S. |
| author_sort | Sefcik, Lesley |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Seedling responses to elevated atmospheric CO(2) concentration ([CO(2)]) and solar irradiance were measured over two growing seasons in shade-tolerant Acer saccharum Marsh. and Fagus grandifolia J.F. Ehrh. and shade-intolerant Prunus serotina, a J.F. Ehrh. and Betula papyrifera Marsh. Seedlings were exposed to a factorial combination of [CO2] (ambient and elevated (658 micromol mol-1)) and understory shade (deep and moderate) in open-top chambers placed in a forest understory. The elevated [CO(2)] treatment increased mean light-saturated net photosynthetic rate by 63% in the shade-tolerant species and 67% in the shade-intolerant species. However, when measured at the elevated [CO(2)], long-term enhancement of photosynthesis was 10% lower than the instantaneous enhancement seen in ambient-[CO(2)]-grown plants (P < 0.021). Overall, growth light environment affected long-term photosynthetic enhancement by elevated [CO(2)]: as the growth irradiance increased, proportional enhancement due to elevated [CO(2)] decreased from 97% for plants grown in deep shade to 47% for plants grown in moderate shade. Results suggest that in N-limited northern temperate forests, trees grown in deep shade may display greater photosynthetic gains from a CO(2)-enriched atmosphere than trees growing in more moderate shade, because of greater downregulation in the latter environment. If photosynthetic gains by deep-shade-grown plants in response to elevated [CO(2)] translate into improved growth and survival of shade-intolerant species, it could alter the future composition and dynamics of successional forest communities. |
| first_indexed | 2025-11-14T11:11:06Z |
| format | Journal Article |
| id | curtin-20.500.11937-77908 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:11:06Z |
| publishDate | 2006 |
| publisher | OXFORD UNIV PRESS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-779082020-05-11T07:52:27Z Photosynthetic responses to understory shade and elevated carbon dioxide concentration in four northern hardwood tree species. Sefcik, Lesley Zak, D.R. Ellsworth, D.S. Science & Technology Life Sciences & Biomedicine Forestry Acer saccharum Betula papyrifera deep shade downregulation Fagus grandifolia nitrogen limitation photosynthetic enhancement Prunus serotina ATMOSPHERIC CO2 CONCENTRATION GROWN PINUS-RADIATA LONG-TERM ELEVATION LIGHT-AVAILABILITY POPULUS-TREMULOIDES DEEP SHADE SEEDLING RESPONSES PARTIAL-PRESSURE CANOPY POSITION N AVAILABILITY Seedling responses to elevated atmospheric CO(2) concentration ([CO(2)]) and solar irradiance were measured over two growing seasons in shade-tolerant Acer saccharum Marsh. and Fagus grandifolia J.F. Ehrh. and shade-intolerant Prunus serotina, a J.F. Ehrh. and Betula papyrifera Marsh. Seedlings were exposed to a factorial combination of [CO2] (ambient and elevated (658 micromol mol-1)) and understory shade (deep and moderate) in open-top chambers placed in a forest understory. The elevated [CO(2)] treatment increased mean light-saturated net photosynthetic rate by 63% in the shade-tolerant species and 67% in the shade-intolerant species. However, when measured at the elevated [CO(2)], long-term enhancement of photosynthesis was 10% lower than the instantaneous enhancement seen in ambient-[CO(2)]-grown plants (P < 0.021). Overall, growth light environment affected long-term photosynthetic enhancement by elevated [CO(2)]: as the growth irradiance increased, proportional enhancement due to elevated [CO(2)] decreased from 97% for plants grown in deep shade to 47% for plants grown in moderate shade. Results suggest that in N-limited northern temperate forests, trees grown in deep shade may display greater photosynthetic gains from a CO(2)-enriched atmosphere than trees growing in more moderate shade, because of greater downregulation in the latter environment. If photosynthetic gains by deep-shade-grown plants in response to elevated [CO(2)] translate into improved growth and survival of shade-intolerant species, it could alter the future composition and dynamics of successional forest communities. 2006 Journal Article http://hdl.handle.net/20.500.11937/77908 10.1093/treephys/26.12.1589 English OXFORD UNIV PRESS restricted |
| spellingShingle | Science & Technology Life Sciences & Biomedicine Forestry Acer saccharum Betula papyrifera deep shade downregulation Fagus grandifolia nitrogen limitation photosynthetic enhancement Prunus serotina ATMOSPHERIC CO2 CONCENTRATION GROWN PINUS-RADIATA LONG-TERM ELEVATION LIGHT-AVAILABILITY POPULUS-TREMULOIDES DEEP SHADE SEEDLING RESPONSES PARTIAL-PRESSURE CANOPY POSITION N AVAILABILITY Sefcik, Lesley Zak, D.R. Ellsworth, D.S. Photosynthetic responses to understory shade and elevated carbon dioxide concentration in four northern hardwood tree species. |
| title | Photosynthetic responses to understory shade and elevated carbon dioxide concentration in four northern hardwood tree species. |
| title_full | Photosynthetic responses to understory shade and elevated carbon dioxide concentration in four northern hardwood tree species. |
| title_fullStr | Photosynthetic responses to understory shade and elevated carbon dioxide concentration in four northern hardwood tree species. |
| title_full_unstemmed | Photosynthetic responses to understory shade and elevated carbon dioxide concentration in four northern hardwood tree species. |
| title_short | Photosynthetic responses to understory shade and elevated carbon dioxide concentration in four northern hardwood tree species. |
| title_sort | photosynthetic responses to understory shade and elevated carbon dioxide concentration in four northern hardwood tree species. |
| topic | Science & Technology Life Sciences & Biomedicine Forestry Acer saccharum Betula papyrifera deep shade downregulation Fagus grandifolia nitrogen limitation photosynthetic enhancement Prunus serotina ATMOSPHERIC CO2 CONCENTRATION GROWN PINUS-RADIATA LONG-TERM ELEVATION LIGHT-AVAILABILITY POPULUS-TREMULOIDES DEEP SHADE SEEDLING RESPONSES PARTIAL-PRESSURE CANOPY POSITION N AVAILABILITY |
| url | http://hdl.handle.net/20.500.11937/77908 |