生长速度快的无性系数量成熟期晚于生长较慢的无性系。
The fast-growing clones take longer time to reach quantitive maturity.
随着密度的增加，林分达到数量成熟期的年限变短，若以数量成熟期为采伐年限，则单位面积年均材积产量仍以高密度林分为最大。
Higher density stands reach quatitive maturity earlier than lower density stands, the annual stem volume produced by unit land area of higher density stand is larger than that of lower density stands.
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