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Summary — The material studied consisted of 807 sample plots located in SW Finland. The data were inventoried (in 1951-1953) using a systematic temporary circular plot line survey. Each plot represented a particular stand. An all-sized stand structure (ie a stem distribution resembling an inverted letter J) amounted to 62% of sample plots whereas 25% were even-sized (resembling a normal distribution) and 13% were irregularly uneven-sized. The number of stems per ha in allsized stands was nearly twice that of even-sized stands. The mean annual increment increased linearly with an increase in volume. Consequently, there was no difference in increment between all-sized and even-sized stands because the volume of the growing stock in the latter group was greater than in the former. The mean annual increment in stands with equal average volumes was, however, greater in all-sized mixed stands than in even-sized conifer stands. The relative growth in all-sized mixed stands was approximately 25% higher than in corresponding even-sized stands. stem distribution / stand structure / yield / all-sized stand / even-sized stand / fertile site

Structure and yield of all-sized and even-sized conifer-dominated stands on fertile sites