E. Lahde et al., STRUCTURE AND YIELD OF ALL-SIZED AND EVEN-SIZED SCOTS PINE-DOMINATED STANDS, Annales des Sciences Forestieres, 51(2), 1994, pp. 111-120
This study is based on material collected in southwestern Finland usin
g a systematic temporary circular plot line survey method. A total of
273 sample plots were included in the study. These plots represented S
cots pine (Pinus sylvestris L)-dominated stands established on dryish
mineral soil sites. In half of the sample plots the stand structure wa
s all-sized (ie stem distribution resembled an inverted letter J). Eve
n-sized stand structure (stem distribution resembled a normal distribu
tion) applied in the case of 31% of sample plots while 17% were irregu
larly uneven-sized in structure. The number of trees per hectare in th
e all-sized stands was more than twice that of even-sized stands. The
mean annual increment increased along with an increase in growing stoc
k volume. The volume in even-sized stands was higher than in all-sized
stands but their mean annual increment was equal. Nevertheless, in st
ands with equal average volume (125 +/- 25 m3/ha), the mean annual inc
rement in all-sized stands was one third higher than in even-sized sta
nds.