乔木层（tree stratum）; 灌木层（fruticose stratum）; .
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Diameter distribution of tree stratum reveals truncated normal distribution.
乔木层株数随胸径分布呈现截尾正态分布。
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The minimum sample area of the herb stratum is mainly affected by s but those of the tree and shrub stratum are mainly affected by J.
草本层最小取样面积动态主要受s的影响，而乔、灌木层的最小取样面积变化则与J紧密相关。
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