Growth response to elevated CO2 in seedlings of four co-occurring birch species
| Autor: | F.A. Bazzaz, L. Rochefort |
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| Rok vydání: | 1992 |
| Předmět: | |
| Zdroj: | Canadian Journal of Forest Research. 22:1583-1587 |
| ISSN: | 1208-6037 0045-5067 |
| DOI: | 10.1139/x92-210 |
| Popis: | Seedlings of four birch species were examined to evaluate the presence and extent of phylogenetic constraints on the response of species to global CO2 change. The species differ in their habitat preferences and their successional status. Seedlings were grown for 3 months at near ambient (380 μL•L−1) and double (690 μL•L−1) CO2 concentrations in glasshouses. We found the following: (i) yellow birch (Betulaalleghaniensis Britton) was the only species whose survival differed among CO2 treatments. Survival was slightly increased by elevated CO2. (ii) All growth parameters considered in all four species were significantly stimulated by enriched CO2 conditions, but the magnitude of response was different among species. The most shade-intolerant, fast-growing species (grey birch; Betulapopulifolia Marsh.) took greater advantage of the elevated CO2 resource than the more shade-tolerant, later successional species (e.g., yellow birch). (iii) Patterns of allocation, shoot architecture, and leaf nitrogen content were affected differently by CO2 concentrations for the different species, (iv) The presence and identity of a neighbor did not influence the magnitude or pattern of response to CO2 in birches of a given community. Our results suggest that congeneric species might be more similar in their response to global CO2 in comparison to unrelated species of the same ecosystem that had been studied by others, despite the fact that these closely related birch species differ in their habitat preferences and successional status. |
| Databáze: | OpenAIRE |
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