Table. 2.

Thinning intensity and number of stems before and after thinning in two stand types

Stand type
(major species)
Thinning experimental site Plot No. of stems before thinning (trees/ha) Thinning intensity (%) No. of stems after thinning (trees/ha) Thinning quotient
Stem number basis Basal area basis
Korean white pine plantation
(Pinus koraiensis)
Site 1 A 2,874 62 44 1,090 0.85
B 2,933 50 32 1,468 0.80
C 3,134 42 25 1,823 0.77
D 2,891 0 0 2,891 0
Site 2 A 1,595 61 48 618 0.88
B 1,879 43 23 1,063 0.73
C 1,683 18 8 1,471 0.66
D 1,787 0 0 1,787 0
Oak-dominated natural deciduous forest (Quercus mongolica and Q. variabilis) Site 1 A 3,722 76 63 876 0.91
B 3,699 67 57 1,224 0.92
C 4,321 64 42 1,571 0.81
D 4,272 0 0 4,272 0
Site 2 A 1,304 67 55 435 0.89
B 1,515 62 53 572 0.87
C 1,925 64 42 700 0.78
D 2,593 0 0 2,593 0

For the Korean white pine plantation, thinning was undertaken in 1996 at age 19 for site 1 and in 1999 at age 21 for site 2. For the oak-dominated natural deciduous forest, thinning was undertaken in 1996 for site 1 and 2. The thinning quotient is the quotient between the mean diameter of removed trees and the mean diameter of all trees before thinning. The number of trees was calculated using the whole plot size (e.g., 20 m × 20 m or 30 m × 30 m) by plot of each experimental site.

J Ecol Environ 2022;46:- https://doi.org/10.5141/jee.22.013
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