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• W2123014742 abstract "Many economically important tree species respond positively to an elevated CO2 environment. However, the variability and stability in growth responses among genotypes grown in a global change environment are generally not documented. The present study investigated the differences, at the seedling stage, among 15 maternal families of jack pine (Pinus banksiana Lamb.) in response to an elevated CO2ntemperature environment (CO2T) (700 μ LC O 2 · L n1 with temperatures 4∞C higher than in the ambient CO2T environment), with different nitrogen concentrations. While the elevated CO2T did not significantly alter the overall height growth of seedlings, it significantly increased their total biomass, with needle and root biomass being most responsive. Growth in the elevated CO2T resulted in a 24% reduction in the leaf weight ratio as more biomass was allocated to roots. Significant genotypic differences were observed for height, biomass, and water-use efficiency. Generally, most families kept their rank relative to other families, from the ambient to the elevated CO2T. Also, rank correlations between height of families grown in elevated CO2T and height of families at 10 years of age in the field were significant. This result, combined with the stability we observed in family response from the ambient to the elevated CO2T, suggested that jack pine families currently chosen for their fast-growing capacity will probably remain as such in a global change environment, at least during the seedling establishment stage. Resume : Plusieurs espces diarbre diimportance Oconomique rOagissent positivement ‡ un environnement enrichi en CO 2. Cependant, on a peut dOcrit comment rOagissent diffOrents gOnotypes diune mŒme espce lorsque ces derniers sont soumis ‡ un environnement modifiO par lieffet de serre (changement climatique global avec concentration en CO2 doublOe). Les auteurs ont OtudiO comment rOagissent 15 familles maternelles de pin gris (Pinus banksiana Lamb.), au stade semis, ‡ un enrichissement en CO2 (700 µL CO2•L n1 ) combinO ‡ des tempOratures de 4∞C plus OlevOes que les tempOratures actuelles (environnement CO2T OlevO) et ce, avec diffOrentes concentrations diazote dans le sol. Lienvironnement CO2T OlevO nia pas significativement affectO la hauteur totale des semis; toutefois, il a significativement augmentO leur biomasse totale, principalement en augmentant la masse du feuillage et des racines. Lienvironnement CO2T OlevO a Ogalement rOduit de 24% la proportion de la biomasse totale allouOe au feuillage, une proportion plus importante de cette biomasse ayant OtO allouOe aux racines. La hauteur, la biomasse totale et liefficacitO hydrique ont toutes montrO des diffOrences significatives entre familles. Pour la plupart des variables mesurOes, la majoritO des familles ont conservO, dans lienvironnement CO2T OlevO, le rang quielles avaient les unes par rapport aux autres dans lienvironnement actuel. De plus, des corrOlations de rang calculOes entre la hauteur de chaque famille soumise ‡ lienvironnement CO2T OlevO et leur hauteur respective aprs 10 ans de croissance en champ, Otaient significatives. Ce rOsultat, combinO ‡ la stabilitO des familles quant ‡ leur rang dans les environnements CO2T OlevO et actuel, suggre que les familles de pin gris sOlectionnOes pour leur capacitO ‡ croOtre rapidement dans lienvironnement actuel, conserveront cette capacitO dans un environnement ‡ la fois enrichi en CO2 et lOgrement plus chaud, du moins au stade dietablissement des semis." @default.
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• W2123014742 date "1997-04-01" @default.
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• W2123014742 title "Effects of CO2 enrichment, elevated temperature, and nitrogen availability on the growth and gas exchange of different families of jack pine seedlings" @default.
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• W2123014742 doi "https://doi.org/10.1139/x96-221" @default.
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