Construction of Yield Tables for Sugi (Cryptomeria japonica) in Kumamoto District using LYCS

概要

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This study reports the construction of yield tables using LYCS (Local Yield table Constructing System), a computer program based on a diameter growth model. The method and LYCS was developed by SHIRAISHI and is based on yield tables which are extended using a growth model. Hence, yield tables developed by LYCS don't contradict the original yield tables. According SHIRAISHI, modifying LYCS to a species and an area requires precise analysis of growth models and lots of data. It became clear, however, that analysis of existing yield tables and data to develop a parameter of main growth model for mean diameter could be used in LYCS. On the basis of this, yield tables for sugi (Cryptomeria japonica) in Kumamoto district were constructed. Although it was necessary to modify some equations, the fundamental structure of LYCS was not changed. Three types of yield tables for different density control plans were constructed and should be appropriate for prediction. Changes in the dimeter distribution were predicted to be smaller than those observed. This study proves that the SHIRAISHI method and LYCS are flexible and useful for practical application.
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