生态环境学报Issue(5)：801-805,5.
1961-2010年宁夏无霜期变化特征
Characteristics of frost-free days changes over Ningxia from 1961 to 2010
摘要
Abstract
Based on the daily minimum temperature data at 20 meteorological stations over Ningxia from 1961 to 2010, the frost-free days are calculated according to the climatic index on frost day. Using basic statistical methods and analyzing methods of climatic diagnosis,the climate characteristics and changes trend of frost-free days were studied. The results showed that the spatial distribution of frost-free days was obvious difference: the longest is 166 days(Wuzhong weather station),and the shortest is only 117 days(Longde weather station),the biggest difference of temporal distribution was 49 d;The temporal distribution of frost-free days was also obvious difference: The shortest is in 1972(17 days),the longest is in 2000 and 2001(167 days),and the shortest is only 117 days (Longde weather station). The biggest spatial distribution’s was 46 d. The sort order of the average annual frost-free days, frost-free days under 80% and 90% of the guaranteed-rate all were Yellow river irrigation area>Middle dry area>South mountain area. In recent 50 years, the frost-free days of Ningxia was lengthening with a tendency of 4.7 days per 10 years. Meanwhile the frost-free days of three regions all was obvious lengthening trend, and South mountain area’s lengthening rate was the highest among them, up to 5.8 days per 10 years. Mutation of the frost-free days appeared in 1982 over Ningxia. Among three regions, Yellow river irrigation area and Middle dry area’s mutation was the same, South mountain was 2 years in advance. Study of decadal changes of frost-free showed the longest frost-free days occur at 70s of the 20 century, and the shortest in early 21century,a difference of 20 days. The reasons for lengthening of frost-free days was that the first frost days was postponed,meanwhile the last frost day was earlier. On the whole, lengthening of frost-free days was more favorable for Ningxia's agricultural production.关键词
无霜期/变化特征/气候诊断Key words
frost-free days/characteristics of changes/climatic diagnosis分类
农业科技引用本文复制引用
张磊,张晓煜,李红英,袁海燕,王静..1961-2010年宁夏无霜期变化特征[J].生态环境学报,2013,(5):801-805,5.基金项目
科技部公益性行业（气象）科研专项（GYHY201206023）；2011年度宁夏回族自治区科研院所专项 （）
