RT Journal Article
SR Electronic
A1 Hunková, Veronika
A1 Janák, Karel
T1 The effect of different methods of bark thickness measuring and deduction on the value of round wood volume inside bark
JF Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis
YR 2014
VO 54
IS 5
SP 37
OP 48
DO 10.11118/actaun200654050037
UL https://acta.mendelu.cz/artkey/acu-200605-0004.php
AB Thickness of the bark has serious influence on the round wood volume inside bark, if the diameter is measured over bark. The measured value of the bark thickness depends on measuring method. To analyse the possible bark thickness differences of spruce, given by different measuring methods and Peintinger's bark thickness tables and to calculate the corresponding round wood volume differences, given by different bark thickness deduction compared with the Czech Standard is the principle goal of presented research.Three ways of bark thickness measuring were realized: by using bark gauge, increment hammer and slide caliper. Bark gauge gives the highest bark thickness values - 2,2 mm higher compared with our standard, corresponding volume decrease is 3,4%. Measuring by this method is very carefully to the bark and it gives the real values of the thickness of the undamaged bark layer. It is close to the results of electronic diameter measuring. Slide caliper give the values 0,9 mm higher compared with our standard, corresponding volume decrease is 1,5%. Slide caliper partly damages the surface layer of the bark. Increment hammer gives 0,1 mm higher values of the bark thickness compared with our standard thanks to the destruction of the surface bark layer. Corresponding volume decrease can be approx. 0,1%. Peintinger's bark thickness tables give 1,3 mm higher spruce bark thickness, it means to 1,9 % lower round wood volume. It means, Peintingers tables correspond better with the measured values than with the Czech Standard.We can recommend the using of Peintinger's table for deduction of spruce bark thickness in electronic measuring of the round wood over bark and to use the bark gauge for test measuring. Both two methods gave the closest results to real values while our tests and it is very simple to use this instrument.