摘要
为了给辽阳市农业生产和防灾减灾提供科学依据,利用辽阳市1956—2010年逐日最低气温资料,采用线性倾向估计法研究霜冻发生特征,并分析霜冻对辽阳农作物的影响。结果表明:(1)辽阳市平均初霜冻日为10月13日,平均终霜冻日为4月16日,平均无霜冻期为179天。(2)初霜冻日随年代表现为阶梯式推后,终霜冻日整体表现为提前,只在20世纪80年代出现推后。(3)辽阳市初、终霜冻日和无霜冻期的线性倾向率分别为1.7 d/10 a、-1.2 d/10 a、3.0 d/10 a,初、终霜冻日及无霜冻期的变化趋势在0.05及其以上水平显著。(4)辽阳市正常年份的霜冻对农作物基本无影响,但在个别年份,水稻成熟前或玉米苗期仍有可能遭遇初霜冻或终霜冻,应注意防范。
In order to provide some scientific basis for the agricultural production and disaster prevention and mitigation in Liaoyang City,based on the daily minimum temperature date at Liaoyang Meteorological Station from 1956 to 2010,the impact of frost on the cropper at Liaoyang was analyzed and the characters of frost were studied by using the linear trend method.The results showed that：（1） the average dates of first and the last frost events were October 13thand April 16th,and the average frost-free period was 179 d.（2） It was found that the dates of first frost event delay with decade,while the last frost event advance overall,and the last ones delay only in 1980s.（3） The linear trend rates of first and last frost events and the frost-free period were 1.7 d/10 a,-1.2 d/10 a and 3.0 d/10 a,and the change trends of them were all significant above 0.05.（4） There was scarcely effect of frost in the normal years on the cropper,but in some years,the first or last frost events might occur in the period before the rice mature or the period of maize seedling-coming,and people should prevent it.
出处
《中国农学通报》
CSCD
2013年第29期170-174,共5页
Chinese Agricultural Science Bulletin
关键词
日最低气温
初终霜冻
无霜期
变化趋势
辽阳市
daily minimum temperature
first and last frost event
frost-free period
change trend
Liaoyang City
