Abstract
The influences of snow condition on the seasonal variation of vegetation are investigated in little snow year (1998), normal snow year (1999) and heavy snow year (2000) in the Taki Dam basin of the Agano River. At first, the relationships among NDVI, WI, evapotranspiration and snow covered area are evaluated. The area of snow cover is proportional to mean basin NDVI in snowmelt season. Evapotranspiration in April is 36mm/month in little snow year and 15mm/month in heavy snow year. Secondly, the distribution of vegetation growth ratio to temperature is calculated with a proposed new index. As the results, vegetation growth ratio is faster in the low elevation area (0-1300m), slower in the middle elevation area (1300-1700m) and faster in high elevation area (over 1700m), as temperature increase, respectively. This is related to snow condition and vegetation kinds.
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