Human Impact on the Formation of the Buried Forests of Thujopsis dolabrata var. Hondai in the Northeastern Part of Shimokita Peninsula, Northeastern Japan

摘要

Buried forests of Thujopsis dolabrata var. Hondai are found in the northeastern part of Shimokita Peninsula. Based on ~14C dates and age of B-Tm ash (ca 1,000 yrs BP), the buried humus (paleosols), which is intercalated in sand dunes, was formed at five different times: about 5,3000 yrs BP, 2,700 yrs BP, 1,000-900 yrs BP, 600-500yrs BP, and 200yrs BP. If the buried humus developed on the stabilized sand dunes in the study area, the sand dunes would have formed after 5,000 yrs BP, after 2,500yrs BP, after 1,000yrs BP, after 600yrs BP, and After 200yrs BP.