An Analysis of Concepts and Climate Change Effects on Temperature and Rice Cultivated Calendar in the Gilan (Case study: Rasht Station)

Subject Areas : Urban and Regional Planning Studies

mahmood  roshani ¹ (مدرس دانشگاه آزاد اسلامی واحد رشت)

Received: 2009-02-21 Accepted : 2009-09-16 Published : 2009-08-23

Keywords: Minimum temperature, increasing trend, season displacing, minimum temperature intensity, cultivated calendar,

Abstract :

In this research, first the concepts of the climate changes phenomenon are investigated regarding to their statistical features. Also for better understanding of the concepts of the climate changes phenomenon, it s been analyzed minimum and maximum absolute temperature and temperature mean of Rasht station. For achieving this aim, we collected a forty­­­­-eight year information(1956-2003) of the above mentioned station, next using some statistical analyses and determining equations with applying Spss and Excel software, it has been demonstrated that the rate of the minimum absolute temperature has been increased during four seasons and the temperature mean and absolute minimum in the early of the period(up to 1980) is less than 1980 to 2003.The seasonal graphs of the minimum absolute temperature show that the fluctuation of the minimum absolute temperature in seasons has been decreased from the first periods(1956-1980) to the second periods(1980-2003) also the intensity of the minimum absolute temperature has been reduced and the minimum absolute temperature include on increasing procedure. It s been predicted that the minimum absolute temperature of Rasht station will be increased in spring (5.47), summer(5.6), fall(5.02) and winter (2.75) than the early of the period. Climatically time displacing is being clear within seasons and the cultivated calendar is changing.