关键词: 气候变化, 极端降水, 极端温度

Abstract: There were important impacts of extreme climate events on agriculture. Based on the daily mean temperature,daily maximum temperature,daily minimum temperature and daily precipitation data at 17 stations in Hebei Province(include Beijing and Tianjin)from 1957 to 2006,using linear analysis combined with GIS spatial analysis methods,the spatial and temporal characteristics of changes in weather and climate extremes in Hebei Province over last 50 years were studied. The results showed that both the numbers of heavy rain days and the extreme intense precipitation events decreased,and dry spell events increased,however its increasing tendency was not distinct. There were obvious differences in trends of the extreme intense precipitation and the number of heavy rain days between the east and west parts of Hebei Province. The extreme hot days increased,while the extreme cold days decreased,and the tendency of winter warming was remarkable. Low temperature days significantly decreased,but high temperature days increased a little,it had a very good consistency in the spatial distribution of the extreme temperature events. There were warming and drying trends in Hebei,and the adapting agricultural technique should be taken.

Key words: Climate change, Climate change, Extreme intense precipitation, Extreme temperature