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尾叶桉U6无性系萌芽性能研究

Coppice Performance ofEucalyp tus urophylla clone U6

  • 摘要: 尾叶桉U6是南方分布最广的桉树无性系之一。研究表明, 3个月生的U6的萌芽点、萌芽条数和萌芽高度均服从W eibull分布, 峰度均大于3, 比正态分布的峰值高; 偏度大于0, 呈不对称分布, 数据均值右侧的离散性比左侧的强。萌芽点数按伐桩高度和伐桩直径分布均呈随机性, 表明萌芽点数与伐桩高度和伐桩直径无关, 仅与其生物学特性有关。萌芽条数受伐桩直径和高度的影响, 伐桩直径越大, 萌芽条数越多, 呈线性关系; 当伐桩高度低于16 cm 时, 萌芽条数随伐桩高度的增加而增加, 超过16 cm 高度后随之减少, 呈三次抛物型。萌芽条高度与伐桩高度有关, 当伐桩高度低于12 cm 时, 萌芽高度随伐桩高度的增加而增加, 到12 cm 以后随之减少; 萌芽条高度与伐桩直径呈负相关。

     

    Abstract: Eucalyp tus urophylla clone U6 w as one o f the most common eucalypt c lone planted in Southern China.The resu lts show ed that the number of sprout spo,t copp ice number and he ight at the age of 2months fellow ed theW eibull d istribut ion, the kurtosis w as over 3, higher than no rma l schoo,l the skewness over 0, as an an isomerousd istr ibution. The number o f sprout spotw as related w ith b io log ica l features but no t related w ith height and d iam etero f stumps as it changed w ith random ic ity. Copp ice number a ffected by he ight and diameter o f stumps. The b iggerthe d iam eter, the more the coppice number, it show ed a linearity relat ionship. The coppice number increased w iththe he ight of stumpsw hen the heightw as under 16 cm, itw ould decreasewhen the he igh twas over 16 cm, it fo lloweda thrice parabola. The copp ice heightw as affected by the height of stumps, it increased when stump he igh twas under12 cm, then decreased wh ile over 12 cm; The coppice height w as negat ively related by stump d iameter.

     

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