A GIS based simulation on the potential climate productivity a case study in Gansu Province

Gansu Province lies in-side of mainland,its landforms are complex and changeable, and climate types contain dry weather, half dry, half humidity,high altitude and so on,which made it a natural template of observing and researching the tendency and influence of climate. According to the each station´s year-average temperature and rainfall materials during 1965∼2000, the paper adopts the model of Miami and Thomthwaite to simulate the climate productive potentialities of Gansu Province. It shows:the average range is 1296.94∼57.85 g · m⁻² · a⁻¹estimated by Miami Model or 1155.68 ∼ 32.96 g · m⁻² · a⁻¹estimated by Thomthwaite Memorial Model during last 35 years, the gap between them isn´t too large; the regional differentiation characteristics of the land climate productive potentialities which is high in the east and low in the west, it is unanimous on the whole with the distribution of the local agricultural ecoclimate and hot-water situation; It is complicated that the characteristic of muti-time scale of climate productive potentialities, the cycle change per five years is prominent both in 3-large land potential areas. so it draws the regional differentiation characteristics of the land climate productive potentialities which is high in the east and low in the west, and spatial-temporal dynamic changing tendency during 35 years.