Abstract:

The accurate measurement of log interior decays is the basis of reasonable bucking. With the non-destructive testing technology of stress wave, the interior decay of logs was measured for three kinds of conifer species such as Picea asperata, Abies fabric, Larix gmelinii and nine broadleaved trees, such as Betula platyphylla, Acer mono, Tilia tuan, Populus pseudosimonii, Fraxinus mandshurica, Juglans mandshurica, Ulmus pumila, Ostrya japonica, Quercus mongolica in northeast forest regions. Then we made a comparative analysis between the actual value and the observed value of the interior decayed areas of the logs. The test result indicated that the two-dimensional images of the interior decay from logs could be got with the non-destructive test technology of stress wave, but the measuring accuracy is low. Thus we suggest that !multi-spots" survey method and improved Arbotom stress wave measuring instrument should be used in order to increase the measuring accuracy.

Key words: logs, interior decay, stress wave, two-dimensional image