Al-Qadisiyah Journal For Agriculture Sciences

The study was conducted on the Tigris River, in front of the Al-Kut Barrage. The study period continued (11 months), where six vertical sections were chosen upstream of Kut Barrage, the distance between one section to another was 100 m. The first section begins at 350 m from the front of Barrage. The result showed that variation in the discharge of Tigris River in  upstream of Kut Barrage during the months of the study period, and it is noticed that the values of the discharge of the studied sections ranged from 117.35 m3/sec  to 542.71 m3/sec, and the lowest average value of  discharge was 217.84 m3/sec on August 2018, and the high average value of discharge was 411.19 m3/sec on February 2019. The values of velocity of the current water of the studied sections ranged from 0.121 m/sec to 0.567 m/sec, and the lowest value of velocity was 0.225 m/sec on August 2018, and the high average value of velocity was 0.402 m/sec on April 2019. The flow area of Tigris River ranged from 295.6 m2 to 2080. 8 m² during the period of study. The depth of water levels of Tigris River ranged from 1.36m to 4.68 m, the area of accumulated sediments upstream of Al-Kut Barrage ranged from 1069.2m2 to 2854. 4 m2 during the period of study. The volume of the accumulated sediments upstream Al-Kut Barrage ranged from 139000m3 to 257740m³.

This study has been carried out in Alkut city the center of Wasit province which is located about 180 km south of the capital Baghdad on one from the most important dams constructed on the river Tigris called Alkut Dam . Four pedons have been selected in this study, two pedons (A,B) are located in the lower part of dam and the other two pedons (C ,D) are located in the upper part of dam , sediments samples analysis for particle size distribution and total & available heavy metals concentration (Ni ، Cd ، Zn ، Pb ،Fe ) in the water and sediments.
Results show that the total concentration of nickel ranges between(104.2 - 178.4) mg.kg-1 and the higher value has been found in the second depth (156-126)cm for pedon A and the lower value has been found in the second depth (50-30) for pedon D , while total cadmium concentration ranges between (6.1-2.2)mg.kg-1 and the higher value has been found in the second depth (35-20) for pedon A at the lower part of dam and the lower value has been found in the sixth depth (73-93cm)for the same pedon , the values for total Zinc concentration ranges between (108-69) mg.kg-1 and the higher value has been found in the fifth depth (73-55)cm for pedon A at the lower part of dam and the lower value has been found in the last depth (120-100cm) for pedon D in the upper part of dam, the results of total lead concentration ranges between (24.2-11.35) mg.kg-1 and the higher value has been found in the first depth (0-20cm)cm for pedon A at the lower part of dam and the lower value has been found in the third depth (60-50cm) for pedon D in the upper part of dam , while the total concentration for iron (Fe) which ranges between (4595-2988) mg.kg-1 the higher value has been found in the second depth (20-50cm) for pedon A at the lower part of dam and the lower value has been found in the seventh depth (111-93cm) for the same pedon . As compared with critical limits , results show that total concentration of heavy metals for Cd, Pb, Zn and Ni in Sediments samples all has exceed the critical limits values except in some depths.
The results for the available heavy metal concentrations show that the available nickel concentration ranges between(33.2-107.4)mg.kg-1 and the higher value has been found in the second depth (20-35)cm for pedon A at the lower part of dam and the lower value has been found in the second depth (30-50) for pedon D in the upper part of dam , while total cadmium concentration ranges between (0.21-0.48)mg.kg-1 and the higher value has been found in the first depth (0-20)cm for pedon B at the lower part of dam and the lower value has been found in the sixth depth (73-93cm)for the pedon A at the lower part of dam , the values for the available Zinc concentration ranges between (56-111) mg.kg-1 and the higher value has been found in the tenth depth (191-231)cm for pedon A at the lower part of dam and the lower value has been found in the last depth (120-100cm) for pedon D in the upper part of dam, the results of available lead (pb) concentration ranges between (6.7-20.2) mg.kg-1 and the higher value has been found in the first depth (0-20cm)cm for pedon A at the lower part of dam and the lower value has been found in the third depth (60-50cm) for pedon D in the upper part of dam , while the available concentration for iron (Fe) which ranges between (39-74)mg.kg-1 the higher value has been found in the second depth (20-50cm) for pedon A at the lower part of dam and the lower value has been found in the eighth depth(111-126) for the same pedon ,at the comparison of results for the available concentrations of the studied heavy metals it can be seen that all values have exceeded the critical limits values according to Nunes et al 2014. in the other hand the results show that there is significant correlation between the total and available concentration for same heavy metals pairs of the correlation (r2) between the available and total concentration was 0.90 , 0.74 , 0.99, 0.99 and 0.58 for Ni , Cd , Zn , Pb and Fe respectively , in the other hand, the results show that the water concentration for heavy metals are 1.7 , 0.03 ,15 , 0.07 and 27 mg.l-1 for Ni , Cd , Zn , Pb and Fe respectively , which indicate that all values have exceeded the critical limits according to Iraqi standards and FAW. WHO (2003).

Nineteen filamentous fungi have been isolated from sediments collected from different sites in the Suqalshuyokh marshes of Governorate of Thi- Qar by dilution method. The results show that Deutromycota fungi is more dominant genera with 94.5% and the second dominant genera is Ascomycota with 2.5% the third dominant genera is Zygomycota with 2.5% .Aspergillus niger and Fusarium solani are more frequancy with 100% in all samples, but Aspergillus fumigates , penicillium funiculosum are 83% and the percent of A. flavus reached to 33% , at the same time the percent of another fungi has reached to 16%.
The results showed that the different sites in this study have no high effect on fungi diversity in sediments of marshes due to the similitary of environment in study sites .