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中文摘要：
对淮河流域170个常规气象站1961～2007年逐日平均气温资料进行513滑动平均处理，确定各站逐年稳定通过0℃、10℃、15oC和20℃界限温度的初始和终止日期，并根据确定的初始和终止日期统计获得各界限温度对应积温和持续日数。在此基础上，研究了淮河流域近47年各界限温度的积温、持续日数、初日和终日的变化趋势。结果表明：淮河流域近47年≥0℃、≥10℃和≥15℃积温和持续日数均呈显著增加趋势，≥0℃和≥10℃初日呈显著提前趋势，各界限温度终日均无明显变化。
英文摘要：
A 5-day moving average method was adopted to get the year-by-year beginning dates and ending dates when the temperatures steadily passed 0 ℃, 10 ℃ , 15 ℃ and 20 ℃ between 1961 and 2007 at 170 meteorological stations in Huaihe River Basin. With the dates information the yearly accumulated temperatures and durations of the 4 boundary temperatures were achieved. On the basis of these data, the dynamics of accumulated temperatures, durations, beginning dates and ending dates of the four boundary temperatures in the last 47 years in Huaihe River Basin were analyzed. The re- suits showed that both the accumulated temperatures and durations during which the temperatures greater than or equal to 0 ℃ , 10 ℃ and 15℃ increased significantly, and the beginning dates at which the temperature steadily passing 0 ℃ and 10 ℃ were earlier than before significantly. However, the ending dates for all 4 boundary temperatures did not show any significant change.
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