Impacts of climatic change on the suitability of temperature for rice at developmental stages and the potential productivity in the Hang-Jia-Hu Region

Base on the field tests and on-the-spot observation,the parameters for the temperature suitability assessment function and the potential productivity calculation were determined,and the impacts of climatic change on the suitability of temperature for rice at developmental stages and the potential productivity in the Hang-Jia-Hu Region were analyzed.Results indicated that the climatic change had ameliorated the temperature condition at the transplanting and tillering stage and the grain filling and maturing stage of the early rice,and the heading and flowering stage and the grain filling and maturing stage of the late rice.In view of the average value of the temperature suitability assessment of the above 4 stages,the average of the duration from 1981 to 1997 was higher than that of the duration of from 1951 to 1980,being 11.1%,5.2%,13.4% and 13.2% up,respectively.From the point of view of the potential productivity,the light potential productivity of the early rice,and the light and the light-temperature potential productivity of the late rice showed a decreasing tendency,except for the significant increase in the light-temperature potential productivity of the early rice.However,the ratio of the light-temperature potential productivity to the light potential productivity showed an increasing tendency both for the early and late rice,indicating that the amelioration of temperature condition and its compensation function were significant.