Abstract: To understand the change patterns  and the relationships between climate and phenophase is of significance in instructing agricultural production and environmental monitoring. This paper analyzed the change trends of the phenophase of herbaceous plants in different areas of Inner Mongolia in spring 1982-2006, and of the air temperature at the prophase of the plants. The models for predicting the first flowering date of herbaceous plants in mid-west and east Inner Mongolia were established, and the future changes in the first flowering date in the scenario of climate warming were evaluated. Since the 1980s, the first flowering date was advanced, air temperature was increasing, and climate warming was more evident in spring than in winter. The change trends of the first flowering date and air temperature had obvious regional characters. In the mid-west area of Inner Mongolia, the advance in the first flowering date and the increase of air temperature were more evident than those in the east area. The first flowering date and the air temperature in spring varied evidently in the two areas, and the variation of the air temperature in winter was more evident in the mid-west area than in the east area. The first flowering date was negatively related to the prophase air temperature, and the main affecting factor was the air temperature in spring. If the air temperature raised 1.0 ℃ in the future, the first flowering date would advance 3.1 to 5.0 days.

Key words: Pteroceltis tatarinowii, Ca²⁺ concentration, Height growth, Biomass, Bark quality