Abstract: Considering global climate change unusually in precipitation and temperature, the author simulated its influence on the Potential Evapotranspiration Rate (PER) in Sichuan Basin under five kinds of climate combinations in the future using information technology. The result indicated that the PER-value in Sichuan will become higher when air temperature in the whole world goes up. The distribution will start from 4 sensitive spots as the center and expand from southeast to northwest. But with the increasing precipitation, the PER-value will decrease and the distribution trend will shrink gradually in the direction to southeast.

Key words: Cu, Trifolium repens, Growth, Soil enzyme activity