Characteristic Analysis on the Annual Variation of Agro-meteorological Climate Resource in Spring Growing Season in Northeast Sichuan

Based on the meteorological data of 21 counties in the Northeast of Sichuan province from 1961 to 2008,factors concerning the Agro-meteorological climate resource in spring growing season was statistically analyzed.Some abrupt changes of every resources factor have been detected by using Mann-Kendall test method.The result shows that the first day of ≥10℃ appears earlier than nomal whereas the last day of ≥20℃ and ≥22℃ comes late.Within the limit temperatures,accumulated temperature rose,precipitation changed slowly and sunshine time decreased and the entire agro-meteorological climate resources did not show abrupt change except the sunshine time.The sunshine time of nearly 86% area experienced an abrupt change of decrease.All these changes will affect the layout and structure of agricultural production and crop planting.The findings in this study can be helpful for making a better use of the local agro-meteorological climate resource.