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1984年对1年生桤木幼苗,固定5个30×30厘米的样方,定期测定高、基径、叶片生长情况如下:1、幼苗出土到第1片真叶需20天左右,苗高2.7厘米,基径0.1厘米,叶片长0.56厘米,宽0.49厘米.第1—2片真叶需20天左右,苗高2.87厘米,基径0.3厘米,最大叶片长0.73厘米,宽0.65厘米.第2—3片真叶需15天左右,亩高3.64厘米,基径0.45厘米,最大叶片长1.34厘米,宽0.65厘米.3—4片真叶需14天左右,苗高3.99厘米,基径为0.7厘米,最大叶片长1.4厘米,宽0.84厘米.4—5片真叶时需8天左右,苗高4.68厘米,基径0.93厘米,最大叶片长1.76厘米,宽1.39厘米.5—6片真叶需6天左右,苗高5.8厘米,基径1厘米,最大叶片长2.45厘米,宽1.4厘米.6—7片真叶约需5天,亩高6.74厘米,基径1.53厘米,
In 1984, for 1-year-old Alnus cremastogyne seedlings, 5 × 30 cm × 30 cm quadrats were fixed. The height, basic diameter and leaf growth were determined as follows: 1, Cm, base diameter of 0.1 cm, leaf length 0.56 cm, width 0.49 cm The first 1-2 true leaves need about 20 days, 2.87 cm tall, base diameter of 0.3 cm, the largest leaf length 0.73 cm, width 0.65 cm. -3 true leaves need about 15 days, 3.64 centimeters high, 0.45 centimeters in diameter, the largest leaf length of 1.34 cm, width 0.65 cm .3-4 true leaves to be about 14 days, 3.89 cm high, base diameter 0.7 Cm, the largest leaf length 1.4 cm, width 0.84 cm .4-5 true leaves takes about 8 days, 4.68 cm high seedling base diameter of 0.93 cm, the largest leaf length 1.76 cm, 1.39 cm wide .5-6 true leaves 6 days or so, seedling height 5.8 cm, base diameter 1 cm, the largest leaf length 2.45 cm, width 1.4 cm 6-7 true leaves about 5 days, 6.74 cm high, 1.53 cm in base diameter,