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Growth and C allocation of Populus tremuloides genotypes in response to atmospheric CO2 and soil N availability by MARK E. KUBISKE; KURT S. PREGITZER; DONALD R. ZAK; CARL J. MIKAN is a Agricultural and Biological Sciences article available to read on EtoBox.

What is Growth and C allocation of Populus tremuloides genotypes in response to atmospheric CO2 and soil N availability about?

We grew cuttings of two early (mid Oct.) and two late (early Nov.) leaf‐fall __Populus tremuloides__ Michx. genotypes (referred to as genotype pairs) for __c__. 150 d in open‐top chambers to understand how twice‐ambient (elevated) CO~2~ and soil N availability would affect growth and C allocation. For the study, we selected genotypes differing in leaf area duration to find out if late‐season photosynthesis influenced C allocation to roots. Both elevated CO~2~ and high soil N availability significantly increased estimated whole‐tree photosynthesis, but they did so in different ways. Elevated CO~2~ stimulated leaf‐level photosynthesis rates, whereas high soil N availability resulted in greater total plant leaf area. The early leaf‐fall genotype pair had significantly higher photosynthesis rates per unit leaf area than the late leaf‐fall genotype pair and elevated CO~2~ enhanced this difference. The early leaf‐fall genotype pair had less leaf area than the late leaf‐fall genotype pair, and their rate of leaf area development decreased earlier in the season. Across both genotype pairs, high soil N availability significantly increased fine root length production and mortality by increas

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Author

MARK E. KUBISKE; KURT S. PREGITZER; DONALD R. ZAK; CARL J. MIKAN

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Cambridge University Press (CUP); Wiley (ISSN 0028-646X)

Published

1998

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)