A stem taper equation compatible to volume equation for Paraserianthes falcataria in Pare,East Java,Indonesia: its implications for the plantation management |
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Authors: | Susumu Kurinobu Daryono Prehatin Naiem Mohanmad Kenji Matsune |
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Affiliation: | (1) Kansai Breeding Office, Forestry and Forest Products Research Institute, Sho-ou, Katsuta, Okayama 709-4335, Japan;(2) Faculty of Forestry, Gadjah Mada University, Yogyakarta, Indonesia;(3) Tsukuba Res. Inst., Sumitomo Forestry Co. Ltd, Tsukuba, Japan |
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Abstract: | A stem taper equation compatible to the volume equation was derived from the data of 172 trees sampled in the three plantations of Paraserianthes falcataria in Pare, East Java. The stem taper equation in this study was based on a conventional logarithmic volume equation, with the addition of one free parameter that minimized the standard errors of estimate to the observed diameter of stems at 1.0-m intervals. The derived equation was able to predict the stem taper of P. falcataria reasonably well, while it was not flexible enough to describe delicate changes of the taper in the upper portion of stem. The equation was able to predict bole length and the volume up to the top diameter 20 cm, the diameter size merchantable for sawn timber in Indonesia, with reasonable accuracy. An appropriate rotation age for sawn-timber production was found to be 8–9 years old, at which the mean annual increment of sawn timber would be maximized. |
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Keywords: | Compatible stem taper equation Paraserianthes falcataria Plantation management Sawn timber production Stem volume equation |
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