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Physiological traits versus the proportion of leaf nitrogen in photosynthesis (NP/NL). (A) Photosynthetic nitrogen use efficiency (PNUE) against NP/NL (P < 0.001, r = 0.798). (B) Light-saturated photosynthetic rate (Pmax) against NP/NL (P = 0.002, r = 0.729). Mean values (n = 5) are given for populations of Ageratina adenophora originating from invasive (China, closed circles and India, closed triangles) and native (Mexico, open circles) ranges.
