Content area
Full Text
FRANKLIN, D. C. & HOGARTH, N. J. 2008. Flowering and flooding: factors influencing shoot production in a semelparous bamboo. Culm recruitment by semelparous bamboos has been reported to be severely depressed in the year prior to flowering, providing forewarning of flowering and subsequent die-off. However, supporting data are scant. We monitored productivity in 30 clumps in a wild stand of the riparian bamboo Bambusa arnhemica for four years, following which the clumps flowered and died. Stand-level productivity in the year prior to flowering was a minimum of 78% lower than previous years. However, the rate of depression was unevenly distributed, being close to 100% among clumps lower on the river bank and no more than 50% higher on the bank. This may be due to the impact of early and prolonged flooding in that year. Clumps high on the bank may have benefited from favourable conditions associated with above-average wet season rainfall, raising the possibility that resource allocation to vegetative growth and sexual reproduction in semelparous bamboos is flexible.
Keywords: Bambusa arnhemica, clumps, gregarious monocarpy, northern Australia, recruitment, riparian vegetation
FRANKLIN, D. C. & HOGARTH, N. J. 2008. Pembungaan dan banjir: faktor yang mempengaruhi penghasilan pucuk dalam buluh semelpari. Penghasilan kulma oleh buluh semelpari dilaporkan menurun dengan banyak pada tahun scbelum pembungaan. Ini tanda amaran awal bagi pembungaan dan kematian. Namun, data sokongan adalah kurang. Kami memantau produktiviti 30 rumpun dalam dirian liar buluh riparian, Bambusa arnhemica selama empat tahun. Selepas ini, buluh berbunga dan kemudiannya mati. Produktiviti peringkat dirian pada tahun sebelum pembungaan yang minimum ialah 78%. Kadar penurunan tidak sekata-hampir-hampir 100% dalam rumpun pada kedudukan dekat tebing sungai dan kurang riaripada 50% pada kedudukan lebih tinggi. Ini mungkin disebabkan kesan banjir awal dan berpanjangan pada tahun tersebut. Rumpun yang berada jauh dari tebing sungai mungkin mendapat manfaat daripada keadaan baik yang dikaitkan dengan hujan yang banyak semasa musim lembap. Ini mencadangkan bahawa pengagihan sumber bagi pertumbuhan vegetatif dan pembiakan seks dalam buluh semelpari mungkin fleksibel.
INTRODUCTION
Semelparous bamboos are widely reported to produce few or no culm shoots in the year prior to flowering (Troup 1921, Prasad 1987, Vazquez-Lopez et al. 2004). However, supporting data are scant (see Banik 1995 for an exception). The issue may explain the allocation of resources to...