| Research on the climatic period and abrupt changing characteristics in three large cotton areas of Hebei Province |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2014.05.039 |
| Key Words: climatic period climate abrupt change wavelet analysis |
|
| Hits: 1510 |
| Download times: 1071 |
| Abstract: |
| Using the daily climatic data of 15 meteorological stations from 1961 to 2010 in cotton-growing areas of Hebei Province, has analyzed the climatic period wave and abrupt changing point in different cotton areas. The result showed that: The temperature, rainfall and sunshine jn whole cotton growing season equally existed the periodic changing characteristics of multi-time scale in different cotton-growing areas, and alternate phenomenon was obvious. The decade and interannual main periods of mean temperature during whole growth stage were: In Jinan and Jizhong cotton areas were 20 to 22 yaers, 9 to 10 years and 5 to 7 years. In Jidong cotton area was 22 to 24 years and 11 to 14 years. The mean temperature in whole growth period was obvious increase and in 1996 was occurred the abrupt change to turn into the relative higher period. The main period of precipitation in whole growing stage was: In Jinan cotton area was 14 to 15 years, and in Jizhong and Jidong cotton areas were 22 to 24 years and
8 to 10 years. The sunshine in whole growth stage existed the climatic period wave of 9 to 10 years also before and after 1986 occurred the abrupt change to turn into the relative less period. |