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• W2158397069 abstract "Summary We had two objectives: (i) to determine the generality of, and extend the applicability of, a previously reported empirical relationship between leaf‐level net photosynthetic rate ( A M , nmol g −1 s −1 ), specific leaf area (SLA, m 2 kg −1 ) and leaf nitrogen mass fraction ( N M , mmol g −1 ); and (ii) to compare these empirical results with a mechanistic model of photosynthesis in order to provide a mechanistic justification for the empirical pattern. Our results were based on both literature and original data. There were a total of 160 and 87 data points for the leaf‐level and whole‐plant data, respectively. Our multiple regression for single leaves was ln( A M ) = 0·66 + 0·71 ln(SLA) + 0·79 ln( N M ), r 2 = −0·80; only the intercept (0·11) differed for the whole‐plant data. These results are not significantly different from previously published relationships. We then converted the mechanistic model of Evans and Poorter, and a modified version which includes leaf lamina thickness ( T ) and leaf dry matter (tissue) concentration ( C M ), into directed acyclic graphs. We then derived reduced graphs that involved only T , C M , SLA, N M and A M . These were tested using structural equation modelling, with measured lamina thickness ( T ′) and leaf dry matter ratio (LDMR, g dry mass g −1 fresh mass) as indicators of T and C M . The original Evans–Poorter model was rejected, but the modified version fitted the structural relationships well. The same qualitative models also applied to the whole‐plant data, although the path coefficients sometimes differed. Using simulations, we show that the original Evans–Poorter model predicts a positive correlation between SLA and N M that maximizes A M . The data closely follow this predicted relationship. The correlation between the actual values of A M (standardized units) and the predicted values obtained from the modified Evans–Poorter model was 0·74 and increased to 0·82 once three outlier points were removed. These results provide a mechanistic explanation for the empirical trends relating leaf form and carbon fixation, and predict that SLA and leaf N must be quantitatively co‐ordinated to maximize C fixation." @default.
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• W2158397069 date "2005-08-01" @default.
• W2158397069 modified "2023-10-15" @default.
• W2158397069 title "Functional linkages between leaf traits and net photosynthetic rate: reconciling empirical and mechanistic models" @default.
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• W2158397069 doi "https://doi.org/10.1111/j.1365-2435.2005.01008.x" @default.
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