Abstract
Suitable planting base is necessary for coastal tree growth. In this study, to accumulate the examples of investigation using a combined penetrometer-moisture probe (CPMP) for evaluating planting base of a coastal forest, soil moisture and soil softness observation using CPMP was conducted together with tree measurement in seven coastal Pinus thunbergii Parlat. stands in Oshamambe, Hokkaido Prefecture, Japan. While four forest stands were sound, three forest stands were declined. Declined forest stands tended to have higher soil water content at a certain depth than sound forest stands. However, differences in soil water content were not clear between sound and declined forest stands in some cases. Also, relationship between soil softness and coastal tree decline was not clear in this investigation. Thus, further research is necessary for establishing a method to evaluate planting base of coastal forests using CPMP, although we could confirm that CPMP has a potential to evaluate it.
https://ror.org/026j3ca82 
