Isoscape monitoring of effect of global warming and land use change on water and material cycling-Hokkaido Isotope Map

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Isoscape monitoring network was established, and Hokkaido Isotope map on water and nitrogen was made on river, ground water, and lake water. Precipitation was also observed at monitoring stations. Water isotope map showed spatial distribution of d-excess differs between summer and winter reflection the moisture source of winter precipitation generally in Hokkaido. However, constant and also high d values were observed in rivers south of Shikotsu lake, indicating a large ground water system probably connecting to Shikotsu lake. Nitrate concentration was high in the rivers in farmland. Nitrate d^<15>N showed also wide range but mostly 0 to 8‰. Variation may depend on the difference in source of N.