Climate change Effects of Surface soil temperature profile in Ahwaz
Subject Areas : Irrigation and Drainage
کاظم حمادی
1
(هیدرولوژی و منابع آب سازمان آب و برق خوزستان.)
فاطمه ذاکرحسینی
2
(رسوب شناسی و سنگشناسی رسوبی سازمان آب و برق خوزستان)
Keywords: تغییر اقلیم, دمای محیط, دمای خاک, سری زمانی و روند,
Abstract :
In arid and semi-arid regions, soil surface warming is a considerable phenomenon causing a high thermal gradient which makes water flow intensely. The degree of soil temperature is effective on crop production, plant growth and soil microorganisms. In recent years, the ascending trend of temperature has been substantially noticed by researchers in the issues of pointwise climate change and at watershed level. The present study proved the occurrence of ascending trend in time series of temperature through both non-parametric and Mann Kendall parametric tests as well as linear regression in synoptic station in Ahwaz province, Iran. Next, meanwhile the degree of trend was determined, the relations of SoilMedium temperature were obtained for the depths of 5 and 30 cm. Applying the relations of air temperature ascending trend together with the relations of soil-medium temperature both developed a new relation which can express the ascending tend of soil temperature based on medium temperature. These relations indicated that, in depths of 5 and 30 cm, the soil temperature is higher respectively by 2 and 1 ˚C than medium temperature. Furthermore, the ascending trend of temperature gradient of soil surface profile in depths of 5 and 30 cm is respectively 0.038 and 0.030 ˚C per year. Although the increase of soil temperature is assumed to be limited, these low soil temperature changes are effective on plant growth and soil properties like moisture profile of soil structure alteration, thermal conductivity, heat capacity and heat diffusion coefficient.
IPCC. (2007). Summary for Policymarkers, in: Climate Change, Cambridge University Press, Cambridge, pp: 1-18.
Rasoli,A. (2004). Preliminary analysis of time series of air temperatures in Tabriz, Scientific and technical journals maker, 46 & 47, pp: 7-26.
Asakereh, H. and Kheradmand M, D. (2002). The average monthly temperature SARIMA model, Journal of Scientific and Technical maker, Issue 46/47- pp: 41-45.
Hammadi, K., Zakeri Hussain, F. And comprehensive, D. (2009). The phenomenon of climate change (temperature) and its impact on agricultural water use in Khuzestan Plain, Khuzestan Water and Electricity Water Research Council, 94 p.
Massah Bavani, A.S. and Morid, S. (2004). The effects of climate change on water resources and agricultural production Case study: Zayandehrood basin, Iranian journals Water Resources Research, 1, 1, pp: 40-47.
Ashofteh, P. and Masah Bavani, A.S. (2009). A case study of the impact of uncertainty of climate change on flood regime Aidoghmoush Basin, East Azerbaijan, Iranian journals Water Resources Research, 2, Summer 2009, pp: 27-39.
Smadi, M.M. and Zghoul, A. (2006). A Sudden Change In Rainfall Characteristics In Amman, Jordan During The Mid 1950s ", American Journal of Environmental Sciences 2,3, pp: 84-91.
Ma, Z., Kang, S. Z., Zhang, L., Tong, L. and Su, X. (2008). Analysis of impacts of climate variability and human activity on streamflow for a river basin in arid region of northwest China, Journal of Hydrology, 352, pp: 239-249.
Bay-Bvrdy, D. (1994). Soil Physics, Fifth Edition, Tehran University Press, 671 pages.
Arnon, A. (1989). The principles of agriculture in arid areas, 1, Translated by Koochaki, A. and Alizadeh, A. the publication of Astan Quds Razavi, 260 pages.
Chiew, F. and Siriwardena, L. (2005). Trend User Guide, Cooperative Research Centre for Catchment Hydrology, Australia, 23 p.
Kendall, M. G., Stuart, A. (1973). The Advanced Theory by Statistics. Griffin, London.