Studies on the Formation of Floorscape in Recreatio L Forest by Planting Wild Flowers the Effects O Flight Condition and Cutting on the Growth of Platycodon Grandiflornm

27 Mar Studies on the Formation of Floorscape in Recreatio L Forest by Planting Wild Flowers the Effects O Flight Condition and Cutting on the Growth of Platycodon Grandiflornm

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Abstract

粗放的管理を前提とするレクリェーション林における野生草花型林床景観の形成手法を確立するために, キキョウを材料としてコナラ林における生育と光条件との関係, さらに, 競合植物を抑えるための下刈りが生育と開花に及ぼす影響を調査した。生育は林内相対照度が約40%の明区で優れ, 年1度の刈取りは本種に致命的な影響を与えなかった。6, 7, 8月刈りでは2度の花期を持ち, 特に7月刈りでは開花量が無刈取りのものより増加した。

English Abstract

The purpose of this study is to establish the ma gement method of wild flowering plants in order to create the beautiful floorscape in recreatio l forests. In this study, Platycodon grandi florum was used as an experimental material, and the effects of light intensity and cutting on the growth and flowering were examined.
Platycodon were planted on the floors of Quercus serrata forest which were prepared in light and dark conditions (Table 1). On the other hand, the similar sized Platycodon were planted in the 1/2000 Wagner pots on the open field. These pot plants were cut off at ground level in May, June, July, August and September, respectively. Besides, another treatment of cutting at a height of 10cm was added only in June.
The results are as follows:
(1) The growth of the plants in the Quercus stand was larger in the light condition, while some stems fell or died in the dark condition (Fig. 1). Moreover, the next year, Piatycodon grew vigorously and many seedlings were observed in the light condition.
(2) The regrowth of June-cutting was the greatest among ground level cuttings. In every treatment except September-cutting, the number of new stems amounted to more than three times as many as the control (Fig. 2).
(3) The tural flowering term is from the middle of June to the middle of July. But the plants cut in June, July and August had the second flowering about two months later after cutting. Especially, the number of flower in July-cutting was approximately 1.4 times and the fl owering term was about 2.4 times compared with the control (Table 2).
(4) Platycodon were hardly affected by any cutting time. Particularly, the root weight in May, June, July and August-cutting was almost equal to the control. But in the case of Junecutting at the height of 10cm, the root was about half in weight with the ground level cutting (Fig. 3). This suggests that the ground level cutting is more suitable for the reproduction.