Similarity in pollen count between White Birch in Hokkaido and Cryptomeria japonica in Oita

Abstract

I sought to find identify a potential similarity in pollen count between white birch in Hokkaido prefecture and Cryptomeria japonica in Oita prefecture located 1,380km south-west from Hokkaido. The pattern matching method revealed that, the of the graph of the pollen counts of Cryptomeria japonica from 2003 to 2012 is similar to that of the white birch from 2002 to 2011, indicating that there is a one year delay in the pollen count of the white birch compared to that of Cryptomeria japonica. The pollen count of Cryptomeria japonica can, therefore, be predicted one year in advance, based on the pollen count of the white birch.