Abstract
SUMMARY (5) Stomatal conductance of 2 and 3-year-old foliage was 0.48 and 0.31 times gs of 1-year-old foliage, respectively. This rapid drop in gs with leaf age had a substantial effect on average gs of the canopy. Because of the lack of information we did not calculate sample size requirements for stratifying with respect to age. (6) Stratification of sampling into three layers and three age classes estimated average
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