In order to promote the development of forestry and the conservation of forests in suburban areas, the forest use planning system was proposed. The optimal forest allocation plan and the needed forest policies in Kishiwada City in Osaka was investigated as a case study by using the system. In forest use planning, first the planning areas was divided into 278 meshes and the meshes suited for forestry use were selected by the mesh analysis of the land use factors. Secondly, the forest functions of the meshes for forestry use were estimated as numerical values by the principal component analysis of the forest mesh data. The degrees of the forest functions, timber production, water regulation, outdoor recreation and landslide control, were respectively represented by the principal component scores. And the optimal forest site map was determined by selecting the function which has the highest score in each mesh. In order to grasp the problems in carrying out the optimal plan, the questionnaire on forest use was conducted on the forest owners in the planning areas. As a result, the planning area was classified into 3 types on the basis of the forest owners' consciousness for forest use from the questionnaire. Then the needed forest policies for the promotion of forestry and the conservation of forests were respectively proposed.

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The most important decision that a forest ower must make is to determine whether a forest stand should be cut or reserved, or when it should be cut in accordance with the estimation of its financial maturity period. As for the financial maturity, there exists a traditional forest valuation studies which can give computationally precise calculation, but the room for their actual application to practical forest management problem is not wide because they use static models. In this paper we can apply the multistage linear programming method (MLPM) to these problems. This paper deals with a valuation model of silvicultural investment at first, and then discuss how to apply MLPM and some application results followed by a discussion. This MLPM can provide the effective information for deciding the financial maturity. period. According to this planning method, we can concretely predict the long term treatment of forest stands more than 30 years and this can furnish effective information on the forest management decision making.

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The forest owners' consciousness of forest and forestry in suburban areas was researched by the questionnaire and analyzed by the quantification theory. The effects of the attributes of the forest owners which influence the cognition of forest functions were estimated by the Coleman two-way additive model. The effects of the districts and the scales of owned forests were relatively high in the cognition of economic functions but the effect of the occupations was stronger than others in the cognition of public functions. The types of the cognition of the forest and forestry problems were clearly classified by the axis of the will to management and many forest owners were concerned about the problems of inheritance tax and forest road. The structure of the forest owners' consciousness was quantified by Hayashi's quantification method and 3 axes were led. They were respectively interpreted as the will to management, the direction of management and the cognition of forest functions. The characteristics of each district were analyzed on the basis of the axis scores. As a result, the high cognition of public functions and the active will to multiple use of forests were observed in the suburban districts.

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The forest is the cradle of human beings, the fundamental element indispensable for their existence. Therefore the forest management analysis, in the modern meaning, is a determining matter of the optimal production and the optimal rotation period to get the maximum economic interest, assuming that the condition of keeping the ecological welfare of the forest. However, up to now, people often only pursue the economic interests instead of the ecological welfare of the forest, in the past analysis of the forest management. Not only that, in China, but also even the economic interests have not been pursued well. This has greatly limited the development of Chinese forestry. In order to solve this issue, this paper demonstrates first the necessity of the convert of its guiding policy of the forest management towards the promotion of the economical usage of the forest production even if in a socialist country. And from this point of view, this paper defines a new method of the analysis, to be more concrete, the manifestation of both the optimal production and the optimal rotation period from a new standpoint. It is well known that the forestry requires much longer production period than any other industries, and the time factor has been the most difficult problem when we try to determine the optimal production and the optimal rotation period. This paper attempts to deal with this problem, by not regarding the time factor as a direct parameter but an intermediary parameter, maximizing the economic interests of forest and maintaining the ecological welfare. By taking Chinese forest production as a subject, this paper studies how to put “the theory of the optimal decision based on time factor intermidiary parameter” into practical application. This work was done by means of the simulation with computer and tried to profess its political significance.

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