Abstract: By using 1982-2003 GIMMS-NDVI data and with the help of GIS spatial analysis, the NDVI time-series data of different vegetation types in Northeast China were extracted. In the meantime, the phenological phases of the vegetation types were simulated by Logistic function, with their variation trends in 1982-2003 analyzed. It was shown that the beginning dates of vegetation growth seasons in needleleaf forest, broadleaf forest, grassland, meadow, and swamp were advanced, and the lengths of the growth seasons were prolonged, being more obvious in swamps, followed by in needle-leaf forests. On the contrary, the beginning dates of vegetation growth seasons in needle-leaf and broadleaf mixed forest, shrub, grassland, and farmland were delayed, and the lengths of the growth seasons were shortened, being more obvious in farmland, followed by in grassland. The ending dates of the growth seasons appeared inconsistent, being delayed in needleleaf forest and swamp, slightly advanced in broadleaf forest, grassland, and meadow, and advanced in needle-leaf and broadleaf mixed forest, shrub, grassland, and farmland, especially in shrub.

Key words: Heat technique, Stem sap flow, Transpiration