Variation characteristics of the starting date and length of seasons over Northeast China during 1961 to 2010
Variation characteristics of the starting date and length of seasons over Northeast China during 1961 to 2010
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发表时间：
2014
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通讯作者：
Wang Le
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作者：
Wang Le
利用东北地区90个气象站1961—2010年的实测资料，采用钱琛提出的四季划分方法，分析了东北地区季节开始日期和季节长度的变化特征，并探讨了季节开始日期和季节长度对农业的影响。结果表明：近50 a来，东北地区春、夏、秋、冬季的平均开始日期分别为4月10日、6月25日、8月11日、10月20日，平均持续时间分别为80 d、51 d、72 d、171 d，且空间差异明显；很明显，随着- 1的趋势，春季和夏季的开始日期变得更早。46 d / 10a和- 1。99 d /10 a，秋季和冬季变晚，值为2。05 d / 10a和0。春、秋、冬季的平均长度逐渐变短，约为- 0。54d / 10a,- 1。15d / 10a和- 2。50 d /10 a时，春季和秋季的置信水平趋于不能通过，但在0。在冬天。夏天以3倍的速度变长。38 d /10 a.早春、晚秋有利于延长作物生育期，对作物品种和种植方式有较大影响。
Using the recorded data from 90 meteorological stations over Northeast China during1961—2010 and the four-season division method proposed by Qianchen,the variation features of starting date and length of seasons were analyzed and its effects on agriculture were discussed. The results show that the average starting dates were April 10,June 25,August 11,October 20 and average length were80 d,51 d,72 d,171 d for spring,summer,autumn and winter respectively over Northeast China in the last 50 years with obvious spatial variations. It is clear that starting dates of spring and summer became earlier with the trends of- 1. 46 d /10 a and- 1. 99 d /10 a,while in autumn and winter,it became later with the values of 2. 05 d /10 a and 0. 90 d /10 a. The average length of spring,autumn and winter became shorter,amounting to- 0. 54 d /10 a,- 1. 15 d /10 a and- 2. 50 d /10 a respectively,the confidence levels in spring and autumn tended not to be able to pass,but it was at 0. 05 in winter. Summer became longer at the rate of 3. 38 d /10 a. The early coming of starting date of spring and its delay in autumn contribute to extending the growing period of crops and greatly affect the crop varieties and planting pattern.