| Changes in vegetation phenology closely related to meteorological and climatic factors.The temperature and precipitation are the main reason that cause the vegetation vary and affect the growth of vegetation directly, and the varation of vegetation phenology can also affect the local microclimate. The study of vegetation phenology change is of great significance in global change research.Northeast region in China belong to the high latitudes, are more sensitive to climate change.To study the timing of vegetation phenology changes have important implications for assessing the impact of global change on terrestrial ecosystems. In this paper, based on the pixel scale using the latest time sequence of the longest GIMMS NDVI3 g remote sensing data in past 31 years(1982 ~ 2012 years) to the northeast and the phenological characteristics of points and vegetation types were analyzed. Results show that:(1)GIMMS 3g data extraction of vegetation phenological parameters are consistent with previous research results and compares the phenology observation station with the ground, which has some reference value and reliability, can update 31 years in the study area of vegetation phenological monitoring;(2) In addition to the changbai mountain in eastern region, the EOS generally start early, SOS and EOS in study region generally shows the tendency of advance gradually from the south to the north.(3) Based on different vegetation types, the change of the vegetation growing season trend analysis over 31 years, in addition to the cultivation of vegetation growing season length showed weak trend to shorten the length of growing season and broad-leaved forest change trend is not obvious, the other vegetation type, length of growing season are extending trend;(4) temperature prompted SOS in advance, EOS delayed, thus longer growing season and precipitation of SOS has both promotion and inhibition, winter and spring precipitation will be delayed EOS, The effect precipitation to LOS is not obvious. |
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