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Part I. Studies the stomatal conductance and photosynthesis in a mature Scots pine forest in eastern England. Use of a null-balance porometer to measure the stomatal conductance of current-year shoots from different levels, aspects, trees and age-classes in the canopy of a plantation forest; Decline in shoot conductance during the day as the water vapour saturation deficit increased; Correlation between photosynthetic rates and the changing incident quantum flux density.