Comparing the use of three dendrometers
for measuring diameters at breast height
Shangbin Liu
Tel: (706) 583-0566
Fax: (706) 542-8356
Email:
sxl6987@owl.forestry.uga.edu
Chris J. Cieszewski
Tel: (706) 542-8169
Fax: (706) 542-8356
Email:
biomat@forestry.uga.edu
Michal Zasada
Tel: (706) 542-7587
Fax: (706) 542-8356
and Faculty of Forestry,
Email:
mzasada@forestry.uga.edu
Abstract:
Three
dendrometers were used to measure diameters at breast
height (dbh). Two of the devices are the well-known
and widely used d-tape and caliper. The third device is the lesser-known and innovative
device called a sector-fork. We use the repeated measures ANOVA method to investigate
the discrepancies amongst these dbh measurement
instruments, since the dbh readings made from them
are highly correlated. The results show that different instruments, the interaction
between instruments and diameter classes, and the interaction between
instruments and plots significantly affect dbh
readings. In general, the d-tape had significantly larger readings than the
other two instruments at 1% significance level. The mean dbh
difference between the caliper and sector fork showed no significant difference
(p-value = 0.9499) when all trees were pooled. The sector fork made larger
readings than the caliper in all 3 plots in the thin diameterclass
but not in the medium and thick diameter classes
Author Keywords:
caliper, d-tape, sector fork, dbh
measurement, repeated measures ANOVA
104
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