Question:
In ______________________, height growth on age shows a typically sigmoid pattern with slow early and late stages and fast growth between.
In ______________________, height growth on age shows a typically sigmoid pattern with slow early and late stages and fast growth between.
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The 'Sigmoid Curve' is the "Growth ID Card" of even-aged stands. It helps foresters decide when to apply thinning and when to harvest (rotation).
Updated On: Aug 20, 2026
- Unevenaged plantation
- Even-aged plantations
- Natural Forests
- Normal forest
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
The question describes the biological growth curve known as the "Sigmoid" (S-shaped) curve and asks where it is most clearly observed in forestry.
Step 2: Detailed Explanation:
• Sigmoid Curve Phases: This curve has three distinct phases:
- Lag Phase: Slow growth during the early establishment/sapling years.
- Log Phase: Rapid, exponential height and volume growth during the middle years.
- Senescence Phase: Growth slows down as the tree reaches maturity/old age.
• Even-aged context: In an even-aged plantation, all trees were planted at the same time. Therefore, the entire stand moves through these growth phases simultaneously.
• Clarity: Because of this uniformity, the height-age relationship for the entire stand clearly forms a sigmoid shape. This is used to develop yield tables.
• Natural Forests: In uneven-aged or natural forests, trees are of all different ages and sizes. Individual curves exist, but the stand-level height growth is much more irregular and complex.
• Conclusion: Uniform plantations of species like Teak, Eucalyptus, or Pine are the classic examples of this growth pattern.
Step 3: Final Answer:
The sigmoid pattern is typically observed in even-aged plantations.
The question describes the biological growth curve known as the "Sigmoid" (S-shaped) curve and asks where it is most clearly observed in forestry.
Step 2: Detailed Explanation:
• Sigmoid Curve Phases: This curve has three distinct phases:
- Lag Phase: Slow growth during the early establishment/sapling years.
- Log Phase: Rapid, exponential height and volume growth during the middle years.
- Senescence Phase: Growth slows down as the tree reaches maturity/old age.
• Even-aged context: In an even-aged plantation, all trees were planted at the same time. Therefore, the entire stand moves through these growth phases simultaneously.
• Clarity: Because of this uniformity, the height-age relationship for the entire stand clearly forms a sigmoid shape. This is used to develop yield tables.
• Natural Forests: In uneven-aged or natural forests, trees are of all different ages and sizes. Individual curves exist, but the stand-level height growth is much more irregular and complex.
• Conclusion: Uniform plantations of species like Teak, Eucalyptus, or Pine are the classic examples of this growth pattern.
Step 3: Final Answer:
The sigmoid pattern is typically observed in even-aged plantations.
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