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• W2105280962 abstract "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 increasing both the amount of root length present, and by decreasing the life span of individual roots. Elevated CO 2 resulted in significantly increased fine root production and mortality in high N but not low N soil and did not affect fine root life span. The early leaf‐fall genotype pair had significantly greater fine root length production than the late leaf‐fall genotype pair across all CO 2 and N treatments. These differences in belowground C allocations are consistent with the hypothesis that belowground C and N cycling is strongly influenced by soil N availability and will increase under elevated atmospheric CO 2 . In addition, this study reinforces the need for better understanding of the variation in tree responses to elevated CO 2 , within and among species." @default.
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• W2105280962 date "1998-10-01" @default.
• W2105280962 modified "2023-10-16" @default.
• W2105280962 title "Growth and C allocation of <i>Populus tremuloides</i> genotypes in response to atmospheric CO₂ and soil N availability" @default.
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• W2105280962 doi "https://doi.org/10.1046/j.1469-8137.1998.00264.x" @default.
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