Fundamental Studies on the Maintenance of Undergrowth and Location Condition of the Established Woods in Parks

Abstract

As a result of urbanization in TUKUBA Academic Town, most of farm forests in which much Pinus densiflora exist, have been altered for various purposes.
The major objective of this report is to clear the methods of utilization and maintenance of existing forests in parks. Based on investigation and analysis of soil condition, actual condition of maitenance and tree condition in forests, farm forests could be classified into 5 types. These are naked type, grassplot type, herb type, underwood type, natural tyze.
In naked type, the degree of hardness of the soil is more than 25mm, whereas in underwood type and natural type, it is less than 15mm. The frequency of herb coverness is less than 50% in the undergrowth in which the relative intensity of illumination is less than 10%. However the frequency of herb coverness in the natural type is increased by covered under ground. Therefore, it is possible that the intensity of illumination in the forest have changed due to he existence of underplots, the condition of the edge of the forests, wideness of forests and height of trees as well as horizontal frequency of coverness.