Question:
Classical ordinary thinning consists of the removal of
Classical ordinary thinning consists of the removal of
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Ordinary Thinning = "Thinning from Below." Imagine cleaning a garden by pulling out the small, shaded weeds to let the big flowers bloom. You remove the "losers" of the canopy race.
Updated On: Aug 7, 2026
- Mature Superior trees
- Mature diseased trees
- Immature inferior trees
- Immature healthy trees
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Question:
Thinning is a silvicultural operation performed in an immature stand to reduce tree density and redistribute the site's growth potential to the remaining, better trees. "Ordinary Thinning" (Low Thinning) is the most traditional type.
Step 2: Detailed Explanation:
• Mechanism of Ordinary Thinning: It is also called "Thinning from below." It mimics natural selection. The forester removes trees that are being naturally crowded out by superior neighbors.
• What is removed? The focus is on the lower canopy layers. The sequence of removal typically follows tree dominance classes: - Class IV: Suppressed trees (first to go). - Class III: Dominated trees. - Class II: Defective Codominants.
• Classification: These trees are immature (stand is still growing) and inferior in terms of position and vigor. By removing these "weak" individuals, more water, light, and nutrients are available for the "Elite" or "Dominant" trees (Class I).
• Why not others? Removing "Superior" trees (A) would be high thinning or "creaming," which degrades the forest quality. While diseased trees (B) are removed, they aren't the defining characteristic of "ordinary" thinning, which focuses on crown competition.
Step 3: Final Answer:
Ordinary thinning is characterized by the removal of immature, inferior trees to favor superior ones.
Thinning is a silvicultural operation performed in an immature stand to reduce tree density and redistribute the site's growth potential to the remaining, better trees. "Ordinary Thinning" (Low Thinning) is the most traditional type.
Step 2: Detailed Explanation:
• Mechanism of Ordinary Thinning: It is also called "Thinning from below." It mimics natural selection. The forester removes trees that are being naturally crowded out by superior neighbors.
• What is removed? The focus is on the lower canopy layers. The sequence of removal typically follows tree dominance classes: - Class IV: Suppressed trees (first to go). - Class III: Dominated trees. - Class II: Defective Codominants.
• Classification: These trees are immature (stand is still growing) and inferior in terms of position and vigor. By removing these "weak" individuals, more water, light, and nutrients are available for the "Elite" or "Dominant" trees (Class I).
• Why not others? Removing "Superior" trees (A) would be high thinning or "creaming," which degrades the forest quality. While diseased trees (B) are removed, they aren't the defining characteristic of "ordinary" thinning, which focuses on crown competition.
Step 3: Final Answer:
Ordinary thinning is characterized by the removal of immature, inferior trees to favor superior ones.
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