中文摘要：

以1951-2013年信阳市城区日均气温为研究对象,运用5日滑动平均、Mann-Kendall检验、小波分析和R/S分析等方法,对四季开始及持续时间变化特征进行研究.结果表明：（1）过去63年,信阳市城区平均入春、入夏、入秋、入冬的时间分别为：3月26日、5月29日、9月19日和11月20日;（2）春季长度具有增加趋势,冬季长度具有缩短趋势,意味着1951-2013年信阳市城区年均温具有升高的趋势,与IPCC报告的结果相一致;（3）四季开始的时间及长度具有短的波动周期（10年内）;（4）未来信阳市城区四季开始及持续时间变化趋势将延续过去63年变化.

英文摘要：

In order to explore the characteristic of beginning and duration of four seasons,the daily average temperature of Xinyang city during 1951-2013 was investigated using 5days moving-average,Mann-Kendall test,wavelet analysis and R/S analysis and so on.The main results contain：（1）the beginning of spring,summer,autumn and winter in Xinyang city during the past 63 years is about March 26 th,May 29 th,September19th and November 20 th,respectively;（2）the length of spring has increasing trend and winter has decreasing trend.It implies that the annual average temperature of Xinyang city goes up during the last 63 years,which has similar conclusions with the report by IPCC;（3）the beginning and duration of four seasons has short cycles（less than ten years）;（4）the future trend of beginning and duration of four seasons in Xinyang city will continue on which of the last 63 years.