Assessment and mapping of early autumn, late spring and winter freezing in Khorasan Razavi province using GIS

آب و خاک

Article 8, Volume 23, Issue 1, March 2009   

Document Type: Research Article

DOI: 10.22067/jsw.v0i0.1536

Authors

A. Mianabadi^{* 1}; M. Mousavi baygi^{* 2}; S.H. Sanaei-Nejad³; A. Nezami⁴

¹Ecology Department, Graduate University of Advanced Technology

²Professor Agro meteorology, Department of Water Engineering, Faculty of Agriculture, Ferdowsi University of Mashhad

³Ferdowsi University of Mashhad

⁴Faculty of Agriculture, Ferdowsi University of Mashhad

Abstract

Abstract
Plants growth and development and physiological activities occur in a certain air temperature range. Spit of this fact that zero temperature named as a freezing temperature, in agriculture meteorology, freezing happen in lower temperature which is different for plants that lead to their tissues damage. Early autumn freezing cause damage to harvesting of cotton and sugar beet and affect on time of wheat and barley planting in Khrasan Razavi. There are also many damages on agricultural products due to late spring freezing each year. This problem leads to loss the flowers during the trees flowering. In order to investing this phenomenon in Khorasan Razavi, the autumn, spring and winter freezing were considered based on suitable temperature threshold and the occurrence probability obtained and mapped. Results show that early freezing in autumn begins from the north and then spread toward the southern regions. The late freezing in spring ends in the south sooner than other areas. Results also show that the winter freezing more occurs in the north.

Keywords: early autumn freezing, late spring freezing, winter freezing, Khorasan Razavi, mapping.