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Table. 8 Mean values of void ratio in different distance zone from the edge of skid trail. Void ratio were measured following 20 and 40 passes on the plots where were established at three different slope classes.

From: Assessment of ground-based skidding impacts on the horizontally rate and extent of soil disturbance along the margin of the skid trail

 

Slope (%)

Passage

Distance zone (m)

0-10

10-20

>20

20

40

20

40

20

40

0.5

2.41cA

2.15cA

1.88bA

1.77bA

1.87aA

1.67aA

1.00

2.72cB

2.36cB

2.11bB

1.90bB

1.79aB

1.72aB

1.50

2.74cC

2.44cC

2.21bC

1.98bC

1.99aC

1.82aC

2.00

2.76cC

2.70cC

2.72bC

2.41bC

2.47aC

1.92aC

  1. Note; void ratio was measured 2.76 for the control area. Values are mean. Different letters within each treatment shows significant differences (P < 0.05)
  2. Capital case letters refer to the comparison made among four distance zones for each skidding cycle and slope class separately (column)
  3. Lower case letters refer to the comparison made between two slope categories at each skidding cycle for the various distance zones (row)
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Annals of Forest Science

ISSN: 1297-966X