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- W1993465752 abstract "We studied relationships among branch hydraulic conductivity, xylem embolism, stomatal conductance (gs), foliar nitrogen (N) concentration and specific leaf area (SLA) of seven tree species growing at four temperate woodland sites spanning a 464–1350 mm rainfall gradient. Specifically, we examined the question: are gs and foliar N concentration coordinated with branch hydraulic conductivity and, if so, what are the implications for carbon assimilation? Area-based, light-saturated photosynthetic rate (Aa) was uniquely and positively correlated with gs and foliar N concentration. Multiple regression analyses showed that, when variability in SLA was controlled for, the (positive) partial slope for each predictor remained significant. In contrast, there was a negative correlation between gs and foliar N concentration such that, for any given Aa, leaves with a high gs allocated less N to foliage than leaves with a low gs. Foliar N concentration was negatively correlated with branch hydraulic conductivity, whereas gs was positively correlated with branch hydraulic conductivity. These relationships were also significant when variability in leaf area to sapwood area ratio, gs and SLA were controlled for in a multiple regression, suggesting that the relationships were unique and independent of other confounding factors. Trees with low water transport capacity were able to support a high Aa by increasing investment in foliar N. Resource substitution occurred such that there was a trade-off between gs and foliar N in relation to branch hydraulic conductivity. High Aa could be sustained through either a high branch hydraulic conductivity and hence high gs and a low allocation to foliar N, or the effect of a low branch hydraulic conductivity and hence low gs could be offset by a high allocation to foliar N. The results are discussed in relation to mechanisms for minimizing the negative effects of limited water availability on carbon gain." @default.
- W1993465752 created "2016-06-24" @default.
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- W1993465752 date "2008-08-01" @default.
- W1993465752 modified "2023-10-16" @default.
- W1993465752 title "Coordinating leaf functional traits with branch hydraulic conductivity: resource substitution and implications for carbon gain" @default.
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- W1993465752 doi "https://doi.org/10.1093/treephys/28.8.1169" @default.
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