Fig. 4. Calculated radiation use efficiency (RUE) versus observed RUE. Three approaches using the existing method of Hammer and Wright (1994) that scales from leaf photosynthesis to canopy RUE are compared. The first comparison (a, Approach 1) used the published functions in the Hammer and Wright (1994) that estimate carbon assimilation (C_A) from light intensity, and uses the response for C_Amax versus SLN taken from this study (Eq. [5]). The second comparison (b, Approach 2) used Eq. [9] for estimating C_A from light intensity with the relationships of C_Amax and C_Adark to SLN being derived from the same data (Eq. [7] and [8]). The third comparison (c, Approach 3) is the same as the second approach but uses Eq. [5] instead of Eq. [7].

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