Abstract
The forest density management of the past, was understood and managed in terms of the yield of stem volume. When the forest is regarded as a carbon sink, we think it should be understood and managed on the basis of tree weight rather than stem volume. The implications are especially important when evaluating a forest that is not intended for timber production. In addition, the full density curves, which are common in various density control systems, are those defined by the tree weight originally. Therefore, the aim of this research is the creation of a yield-density diagram on the basis of tree weight. We surveyed a coastal black pine forest in Shonai. The slope of the full density curve was −0.507. In this study, the Y-N curves of different forest stand ages were calculated from the relationship between forest stand age and B-point. By incorporating the time axis on the yield-density diagram, it became possible to understand and evaluate the relative tree weight of forest stands. In addition, the yield-density diagram can also be applied to density management aimed at high carbon accumulation. The yield-density diagram has been modified as the next-generation approach to meet the needs of the times by using tree weight in this research.
