The survey of growing season length trend and its zoning in Iran

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Research Paper 01/07/2014
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The survey of growing season length trend and its zoning in Iran

Gholamali Mozafari, Moslem Torki, Hamideh Dehghan
J. Bio. Env. Sci.5( 1), 179-188, July 2014.
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Growing cycle is a cycle that it’s during enough humidity, lack of thermal limits; make the production of agricultural crops possible. Evidences show that time of germination season is getting longer about 10-20 days in recent decade. So that early starting is noticeable. This increase of germination season is associated with global warming. The general goal of this article is the survey of changes and zoning of growing season length based on thermal bases 5° and 10c° in 31 Iran synoptic stations during 20 years common statistical cycle using at least daily temperature from 1961 to 2009 DC (1366 -1386 Solar month). In this study is used 49 years data of Iran synoptic stations (1961-2009) to study how is starting and ending of changes trend and germination season length thermal bases 5° and 10° c. the random data is tested by Man-Cendal test, and the series having changes or trend with reliability level 0.05 α are determined . Then by the Man-Cendal graphical test how and starting time of trend or changes is determined and changes value measured. The research result show more changes in the series related to the starting and the ending of germination season with thermal bases 10°c to series with 5c°. In spite of other stations, Oroomiyeh, Khoramabad, Saghez, Shahrekord is faced with decreasing of germination season. Zoning maps showed that growing season length in the studied area is decreased from south to west and west north, so that in the studied thermal bases, Bandarabas station has longest and Shahrekord station has shortest growing season length among other stations.


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