Recently, it has become important to reconsider low-cost silviculture for replantation. In this study, we compared the growth characteristics of the biodegradable container seedlings and the containerized seedlings that are increasing production during one year after planting. As a result, it is suggested that the possibility of water stress due to biodegradable container from the result that biodegradable container seedlings greatly decreased T/R ratio after planting. From the comparison result of RGR, it seems that growth difference between the biodegradable container seedlings and the containerized seedlings was likely to be affected by the difference in initial size. Tensile strength of the biodegradable container planted one year was about 20% lower than unused container. In order to clarify the relationship between the decomposition performance and the root growth,further investigation is required.

The objective of this study was to investigate characteristics of spectral reflectance of arakashi (Quercus glauca) stands using time series Landsat images for developing a method for detecting arakashi stands for sustainable charcoal production. The ratios of surface reflectance, SR of band 2, 3, and 4 to the sum of those SRs (B-rate, G-rate and R-rate) and NDVI were calculated using Landsat images for the period from March to August. This period included the flushing season of arakashi as they shed old leaves and form new leaves. Trend analysis of time series change in those indices were performed for pure arakashi stands and evergreen broad-leaved stands occupied by other species in Misato Town,and also among densely and sparsely arakashi-dominated evergreen broad-leaved stands in Aya Town, Japan. Comparative analysis did not reveal any explicit trend differences in the time series in the indices, while Ortho-photos of arakashi pure stands developed from the aerial images using an UAV highlighted the explicit decrease in B-rate and the explicit increase in G-rate after the flushing season.