雷竹株数按径阶分布服从正态分布。
The number distribution of diameter grade obeys normal distribution.
乔木层株数随胸径分布呈现截尾正态分布。
Diameter distribution of tree stratum reveals truncated normal distribution.
雨日和雨量较多能增加有效株数，提高纤维支数。
More precipitation amount and rain days helped to increase effective stalks and fiber fineness.
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