Document Type: Original Article


1 Associate Prof, Department of Geography Yazd University, Yazd, Iran

2 M.Sc, Yazd University and Chaharmahal & Bakhtyari Metrological Office’s Expert, Shahrekord, Iran


Objective: An increasing number of studies have reported on shifts in timing and length of the growing season, based on phonological, satellite and climatologically studies. Changes in the timing and length of the growing season (GSL) may not only have far reaching consequences for plant and animal ecosystems, but persistent increases in GSL may lead to long-term increases in carbon storage and changes in vegetation cover which may affect the climate system. With the aim of these study is an investigation the trend of time changes of starts and end season growing length in west of Iran. Methods: This investigation has presented 49 years inputs of temperature from 8 synoptic stations in west of Iran. Homogenize the series using run-test experiment were determined and accomplished in the way of auto regression from rebuilding of missed data by way of man-Kendal test the randomness of data was examined and the series that had change or trend with %5 confidence interval were recognized then with graphically man-Kendal test and moving mean of 5 year, circumstances and the start time of trend or changes were determined and the values of changes were calculated. Results: The results show more changes in series associating with start and end of temperatures.


J.T., Ding, Y., Griggs, D.J., Noguer, M., van der Linden, P.J., Dai, X., Manskell, K., Johnson, C.A. (2001), Climate Change: The Scientific Basis. Contribution of Working Group I to the Third Assessment Report of the
International Panel on Climate Change. Cambridge University Press, Cambridge, United Kingdom, p. 881.
Chmielewski, F.-M., Rˆtzer, T., 2001. Response of tree phenology to climate change across Europe. Agric. For. Meteorol. 108, 101ñ112.
Robeson, S.M., 2002. Increasing growing-season length in Illinois during the 20th century. Climatic Change 52, 219ñ 238.
Chen, X.Q., Hu, B., Yu, R., 2005. Spatial and temporal variation of phenological growing season and climate change impacts in temperate eastern China. Global Change Biol. 11, 1118ñ1130.
Linderholm, H.W., Walther, A., Chen, D.L., 2008. Twentieth-century trends in the thermal growing season in the Greater Baltic Area. Climatic Change 87, 405ñ419.
Song, Y.L., Linderholm, H.W., Chen, D.L., Walther, A., 2010. Trends of the thermal growing season in China, 1951ñ 2007. Int. J. Climatol. 30, 33ñ43.
Jeong, S.J., Ho, C.H., Gim, H.J., Brown, M.E., 2011. Phenology shifts at start vs end of growing season in temperate vegetation over the Northern Hemisphere for the period 1982ñ2008. Global Change Biol. 17, 2385ñ
Tayanc, M., Karaca, M., Yenigun, O., 1997. Annual and seasonal air temperature trend patterns of climate change and urbanization effects in relation to air pollutants in Turkey. Journal of Geophysical Research
102 (D2), 1909ñ1919.
Zhang, X., Harvey, K.D., Hogg, W.D., Yuzyk, T.R., 2001. Trends in Canadian streamflow. Water Resources Research 37 (4), 987ñ998.
Kahya, E., Kalayc˝, S., 2004. Trend analysis of streamflow in Turkey. Journal of Hydrology 289, 128ñ144. 

Lins, H.F., Slack, J.R., 1999. Streamflow trends in the United States. Geophysical Research Letters 26 (2), 227ñ230.
Lins, H.F., Slack, J.R., 2005. Seasonal and regional characteristics of US streamflow trends in the United States from 1940 to 1999. Physical Geography 26 (6), 489ñ501.
Partal, T., Kahya, E., 2006. Trend analysis in Turkish precipitation data. Hydrological Processes 20, 2011ñ 2026.
Aziz, O.I.A., Burn, D.H., 2006. Trends and variability in the hydrological regime of the Mackenzie River basin. Journal of Hydrology 319, 282ñ294.
Burn, D.H., 2008. Climatic influences on streamflow timing in the headwaters of the Mackenzie River basin. Journal of Hydrology 352, 225ñ238.

Menzel, A., Fabian, P., 1999. Growing season extended in Europe. Nature 397, 659. me.html.
changes in large-scale atmospheric circulation. Theor. Appl. Climatol. 83, 77ñ88. Kendall, M.G., 1975. Rank Correlation Measures. Charles