Water quality variability and eutrophic state in wet and dry years in wetlands of the semiarid and arid regions |
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| Authors: | J Nouri S A Mirbagheri F Farrokhian N Jaafarzadeh A A Alesheikh |
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| Institution: | (1) Department of Environmental Management, Graduate School of the Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran;(2) Department of Civil Engineering, K.N. Toosi University of Technology, Tehran, Iran;(3) Department of Environmental Health, School of Health, Ahwaz Jondishapour Medical Sciences University, Ahwaz, Iran;(4) Department of Geometrics Engineering, K.N. Toosi University of Technology, Tehran, Iran; |
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| Abstract: | Wetland ecosystems are particularly vulnerable due to flow of nutrients from the surrounding watershed. The study was performed
in the Shadegan wetland, a Ramsar-listed wetland located in the south-west of Iran at the head of the Persian Gulf. The wetland
plays a significant hydrological and ecological role in the natural functioning of the northern Gulf. The proposed wetland
has different water quality characteristics in wet and dry years of study during 1994–2006. To determine the variables, sampling
was carried seasonally for each year at six stations. The results indicate that wetland in wet years had high concentrations
of nitrate and silicate, leading to oligo–meso eutrophic conditions. Wetland in dry years had high phosphate concentrations,
resulting in meso-eutrophic conditions. Forcing functions, such as climatic patterns, water residence time, reduce runoff
and increasing density of wastewaters from the surrounding urban, agricultural and industrial area are probably the main variables
that explain the observed patterns. |
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