Effects of Cutting on the Growth and Flowering of Rannunculus Japonics Thunb

27 Mar Effects of Cutting on the Growth and Flowering of Rannunculus Japonics Thunb

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Abstract

耕作放棄地に美しい群落が観察されたウマノアシガタの刈取り管理方法を鉢植え個体を用いて検討した。ウマノアシガタは5月上旬から中旬にかけて開花し, 夏以降, 株の大きさは徐々に小さくなった。開花前の4月中旬に刈り取ると, 開花数, 結実花数は減少し, 開花盛期の5月中旬に刈り取ると, その後は開花しなかった。開花終了後の6月中旬以降に刈取ると花数や結実花数への影響は無かった。年3回の刈取りでも, 地下部の現存量は, 植え付け時の2.5倍になったため, 消滅に至るほどの影響は無いと判断された。したがって, ウマノアシガタの開花数を確保し, 実生による自然更新を期待するための刈取り適期は, 開花, 結実の終った6月中旬以降と判断できた。

English Abstract

With the common and colorful wildflowers being lost at an alarming rate, the value of wildflowers as landscaping material is being reconsidered. Rannunculus japonicus Thunb. is a typical Japanese wild flower and is sometimes observed along foot paths or abandoned cultivated land. The aim of this study was to determine the suitable time to cut the population of R. japonicus. Cutting tests were performed with potted plants and the plants were cut at different seasons and at 2 cm above ground
Flowering occurs during early and middle of May, and the size of the plants was gradually reduced after summer. Cutting in April before flowering reduced the number of flowers and the number of seeds to half that in the noncutting plants. Cutting the plants in full bloom in May prevented further flowering after cutting. Cutting after the middle of June did not influence the number of flowers or seeds. Even cutting three times a year did not cause fatal consumption of the subterranean part. On the contrary, the root weight increased to 2.5 times the weight at the time of initial planting.
Therefore, to produce to tural regeneration by seeds and sufficient flowers, cutting should be done after the middle of June. Where weeds are growing vigorously it may be necessary to cut again, in August and October.