Deriving a reduction factor for woody part of culm for bamboo Phyllostachys pubescens

作者：Inoue Akio^*; Kitahara Fumiaki; Suga Hideo; Wajima Takahiro

来源：Landscape and Ecological Engineering, 2011, 7(1): 153-157.

DOI：10.1007/s11355-010-0121-4

• Apparent culm volume
• Carbon stock
• Monte Carlo simulation
• Stand transpiration
• Wood volume

We determined the reduction factor for the woody part of culm for one of the largest bamboo species, Phyllostachys pubescens Mazel ex Houz. The determined reduction factor enables us to convert the cross-sectional area of the whole culm into that of the culm wall. We collected 650 cross-cutting sample culms from a stand of P. pubescens in Mt. Toshima, Kumamoto Prefecture, western Japan. For the cut-end surface, the external culm diameter and culm wall thickness were measured, and then the cross-sectional area of the whole culm and the culm wall were computed. The cross-sectional area of the culm wall was strongly correlated with that of the whole culm. The regression analysis between these cross-sectional area indicated that the reduction factor for P. pubescens was 0.311, independent of the magnitude of the cross-sectional area. The independence implied that the determined reduction factor could be directly applied to convert the apparent culm volume into wood volume. Implications of the reduction factor for estimating transpiration and carbon stock of P. pubescens stands were discussed. The Monte Carlo simulation revealed that at least, but not more than, 60-70 cross-cutting culms collected from 20 culms are necessary for the reduction factor when estimating the stand level transpiration and carbon stock.

• 出版日期2011-1