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Estimating the length of rattan stems


, : Estimating the length of rattan stems. Forest Ecology & Management 64(1): 47-57

Increased recognition of the economic importance of rattans has led to a need to develop inventory methods for these species. Stem length is the most important measurement in rattan inventory, as rattan growth occurs as a increase in length rather than in diameter. Therefore, four methods for estimating the length of these climbing palms, whose stems are often long and curved, were tested by a team of four observers. Estimating length using a ruler as a hypsometer was significantly more accurate than estimation by eye, clinometer or internode counts (P lt 0.05). The ruler method also took less time than the clinometer or internode method. One drawback of the ruler method, however, was its greater variability between observers, probably because it was more difficult to learn. The accuracy of the ruler method was least affected by stem length and straightness, both of which are important correlates of estimation error; it was also improved substantially by calibration modelling. Thus, a two-phase procedure is recommended for rattan inventory, involving the destructive measurement of a subsample of stems in order to develop an equation for correcting the remaining estimates of length.

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Accession: 002373019

DOI: 10.1016/0378-1127(94)90126-0

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