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Bosque (Valdivia)

versión On-line ISSN 0717-9200

Resumen

SALAS E, CHRISTIAN; REYES, MAURICIO  y  BASSABER E, CLAUDIA. Measurement of upper-stem diameters with Bitterlich mirror relascope and Finnish parabolic caliper: effects in volume estimations. Bosque (Valdivia) [online]. 2005, vol.26, n.2, pp.81-90. ISSN 0717-9200.  http://dx.doi.org/10.4067/S0717-92002005000200010.

The objective of this study was to compare the Bitterlich mirror relascope and the Finnish parabolic caliper in upper-stem diameter measurements, in stem volume estimation and to determine which gives the best results. The study was done in Rucamanque (old growth native forest, IX region, Chile) where thirty-seven trees were randomly chosen. Diameter measurements were taken at 2, 4 and 6 meters above the ground with relascope and Finnish caliper. The "true" or control values were directly taken on the stem with a traditional caliper, using a stairs. The relascope was unbiased for all upper-stem diameters evaluated, however, the Finnish caliper tended to overestimate (-2,2%) in the 2 meters height diameter measurements. The stem volume (below 6 meters) estimated with the relascope measurements showed to be unbiased (-0,5%). On the other hand, the stem volumes calculated with the Finnish caliper measurements (below 6 meters) were biased (-2,4%), although had a higher precision. The efficiency (bias/time of measurement) of the relascope, in order to obtain the necessary variables for stem volume estimations, was significantly higher than the efficiency obtained with the Finnish caliper.

Palabras clave : upper-stem diameters; stem volume; relascope; Finnish parabolic caliper.

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