Forest Resource Management & Policy

Normal growing stock represents the volume of stands in a forest that has achieved normal increment, normal age-class distribution, and normal density for the given rotation. Option analysis: (A) Normal Growing Stock is the standard forest management term. (B) Regular Growing Stock is not a standard forestry term. (C) Growing stock refers to all living trees without implying normality. (D) Volume stock is an informal term.

For a normal forest with a complete series of age gradations from $1$ to $R$ years where the final volume at rotation age $R$ is $V_R$, the normal growing stock before felling is $\text{NGS} = \frac{V_R \times R}{2}$. Here $R = 10\text{ years}$ and the volume of the mature gradation $V_R = 500\text{ m}^3$. Therefore, $\text{NGS} = \frac{500 \times 10}{2} = 2500\text{ m}^3$. Option analysis: (A) $2150\text{ m}^3$ is incorrect. (B) $2050\text{ m}^3$ is incorrect. (C) $2500\text{ m}^3$ is the correct formula calculation. (D) $3500\text{ m}^3$ is incorrect.