| 要旨トップ | 目次 | | 日本生態学会第59回全国大会 (2012年3月,大津) 講演要旨 ESJ59/EAFES5 Abstract |
一般講演(ポスター発表) P3-099A (Poster presentation)
Lithocarpus glabra (L.gl.) has high ability to evolve in stressful sites. Its root-tubes could perform interesting biological functions. We expect that there should be some trade-offs between shoots and tubes to control regeneration. We assessed responses of L. gl. and L. edulis against stem cutting during 28 months from seeds (Exp. 1). We proceeded also to an experiment consisting of 4 treatments (Exp. 2): control (A), tube cut (B), shoot cut (C), shoot and tube cut (D) with 2-years-old seedlings of L. gl.. Under repeated clipping (Exp. 1), the survival ratio was higher in L. gl.. Sprouting abilities increased with repeated cut but L. gl. exhibited higher variations in shoot production/stump. Slower growth was observed for L. gl. until 2 months after the 2nd cut. Then, a faster turnover of aboveground parts happened. By comparing B to D and A to C (Exp. 2), negative effects of the presence of shoot in survival and regeneration could be found. Although growth and sprouting capabilities differed, the presence of root-tubes in A and C enhanced survival rates. By comparing A to B and C to D, a positive effect of tubes was detected: strong for survival but weaker for sprouting abilities and growth. Tube volume was positively correlated with survival, growth and sprouting abilities. Their dimensional variations did not show any clear influence on regeneration processes.