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(A) Predicted leaf lifespan as a function of nitrogen uptake rate (a measure of nitrogen availability) and (B) noon irradiance (a measure of light availability). Noon irradiance is assumed to be 2000 μmol m−2 s−1 in (A) and nitrogen uptake rate is assumed to be maximal in (B) (the maximal nitrogen uptake rate is the upper limit where the leaf turnover is maintained at a steady state and increases with noon irradiance). Redrawn from Hikosaka (2003).
