عنوان مقاله [English]
نویسندگان [English]چکیده [English]
In this study the climate data (mean annual rainfall and temperature) were examined to investigate possible causes of rain-fed fig orchards drying of Estehban. Precipitation and temperature data for 32-years period 1980-2012 were obtained. Trend test and Mann-Kendall method were used to study changes in precipitation and temperature time series during the statistical period. Drought severity and duration were obtained as well. Results of this study represent no significant trend in the study area average annual precipitation and temperature parameters. However for precipitation of May and temperatures in the months of March, June and July, a significant trend was seen. The results represent no significant trend for precipitation and temperature average in series, annual and monthly in most cases in the study area. Precipitation Changes in stations (Abadeh tashk, Fasa, Aliabad Khafr and Gozon) show decreasing trend in temperature changes at March in stations (Jahan Abade Bakhtegan, Roniz Olia and Do Boneh). Increasing trend and also of drought in the first six months years of With persistence 5 to 7 year was associated Considering to the impact of precipitation distribution on fig Orchards drying. The results of this study show that 36% of trees are affected by the drought. Although in recent years the frequency of mild drought has been more and persistence of drought, with severe and moderate drought years 2007-2008 and 2008-2009 and also an increase in temperature some months leads to drying are rain-fed fig trees.