Zoning of USA for Shanghai introduction with the method of fuzzy analogy preferred ratio.

According to the climate similarity theory,the average maximum(minimum)temperature,average temperature,average precipitation,daily sunlight hour of each month in 1961~1990 and different altitudes were chosen as the analyzing factors.By means of Euclidean distance and fuzzy analogy preferred ratio,climate differences between 207 meteorological stations in America and Shanghai were studied.Then the appropriate introduction area in America was zoned for landscape plant introduction,and it was classified into three areas: suitable area,sub-suitable area,unsuitable area.