Analyzing temporal and spatial variation in evergreen needleleaf forest phenology using remote sensing data

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This study analyzed temporal and spatial variation in evergreen needleleaf forest phenology in eastern Taisetsu Mountain, Hokkaido and in the suburbs of Kanuma, Tochigi, using the MODIS satellite data. From temporal variations in GRVI (Green red vegetation index) data and logistic model fits, phenological transition dates (onset of greenup, maturity, senescence and dormancy) were detected. Results show that mean value of greenup onset for 12 years (the year 2001-2012) in the suburbs of Kanuma was DOY 92, and that in eastern Taisetsu Mountain was DOY 130. Difference in growing periods between two study areas was 100 days approximately. Negative relationships were found between the greenup onset and spring temperature in two study areas.