Affiliations:
1Graduate School of Agriculture, Hokkaido University; Sapporo, 060-8589, Japan.2Research Faculty of Agriculture, Hokkaido University; Sapporo, 060-8589, Japan.3Fukuda Hydrologic Center; Sapporo, 001-0024, Japan. *Corresponding author: Hitoshi Araki Email: arakih@agr.hokudai.ac.jp