システム収穫表の活用(I) : シミュレーションによる意思決定
A practical use of the system yield table (I) : Decision making method using a simulation model

Hirokazu YAMAMOTO
1992 Japanese Journal of Forest Planning  
of the system yield tabIe ( D Decision makhg method using a simulation model . Jpn , J . For . Plann .18:1 -18 ,1992 0ne characteristic of the system yield table is that it adapts nexibly to various stand structures and forest treatments . The purpose of this paper is to examine the practical use of system yield table making good use of this characteristic . In this paper , the volume of yield , utilization and net log income were predicted by a simulation model using a system yield table which
more » ... m yield table which incorporated data regarding various cutting age and thinning patterns in 275 artificial stands in the University Forest at Chichibu. The results of this prediction were as follows .1 ) The rotation in maximum final mean annual increment of yield volume is about 60 years .2 ) The rotation in maximum final mean annual increment of utilizing volume is a little longer than yield volume .3 ) The rotation in maximum final mean annual increment of net log income of Hinohi ' ツ毎 e∬ and Japanese ' arch is longer than yield volume by 15 years .4 ) High site quality and high stand density have a tendency to shorten the rotation . This tendency is more pronounced in net log income , with site qua1 玩y demonstrating a great deal of influence. 5 ) Depending on stand situation , the system yield table is able to make more precise decisions regarding cutting age . This is because of optimum rotations may be calculated for each stand .
doi:10.20659/jjfp.18.0_1 fatcat:qhmd4pofkzhrfg2hoiapjpintq