Thinning Algorithm Parameters

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Applies when Thinning Algorithm = Hugin.

Deciduous/Conifers (x1)

Parameter for adjusting thinning grade of deciduous trees versus conifers.

x1 = 0: Same proportion.

x1 > 0: Thinning grade for deciduous trees is relatively larger than thinning grade for conifers.

x1 < 0: Thinning grade for conifers is larger than for deciduous.

Range: between -1 and 1.

Default: 0

Spruce/Pine (x2)

Parameter for adjusting thinning grade of spruce trees versus pine (including contorta).

x2 = 0: Same proportion.

x2 > 0: Thinning grade for spruce is larger than for pine.

x2 < 0: Thinning grade for pine is larger than for spruce.

Range: between -1 and 1.

Default: 0

From above/below (x3)

Parameter for thinning form.

x3 = 0: Uniform thinning.

x3 > 0: Thinning from above.

x3 < 0: Thinning from below.

Range: between -1 and 1.

Default: -0.2 (i.e. from below)

Second smallest/smallest (x4)

Parameter for distributing thinning grade over two smallest diameter classes, in each thinning species group (spruce, pine, deciduous).

x4 = 0: For each species group, Same proportion in diameter class 1 and 2.

x4 > 0: Higher thinning grade in diameter class 2 than in diameter class 1.

x4 < 0: Higher thinning grade in diameter class 1 than in diameter class 2.

Range: between -1 and 1.

Default: -0.1 (i.e. relatively more of smallest)

Largest/Second largest (x5)

Parameter for distributing thinning grade over two largest diameter classes.

x5 = 0: Uniform thinning.

x5 > 0: Thin more of largest trees.

x5 < 0: Thin more of second largest than of largest trees.

Range: between -1 and 1.

Default: -0.1 (i.e. relatively more of second largest)