Abstract
GPP (Gross Primary Productivity) is an important index to reflect the productivity of vegetation. The MODIS 8-day GPP time-series products in the study area were rebuilt using Savitzky-Golay filter from 2001 to 2012. After phenological parameters' variation was analyzed based on dynamic threshold method, the time series of GPP were analyzed in this paper. Correlation analysis between annual accumulated GPP and influencing factors showed that annual accumulated temperature rather than precipitation has a remarkable positive correlation on GPP. The growing season length of study area was prolonged obviously over the dozen years but no obvious correlation was found between growing season length and annual accumulated GPP.
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