اسم المؤلف:
نور ناظم جابر الميالي
اسم المشرف:
فؤاد منحر علكم
المستخلص:
تناولت الدراسة تركيبة الهائمات النباتية وعلاقتها بالظروف البيئية وبعض العناصر النزرة في مياه نهر الديوانية, اذ جمعت عينات الدراسة (المياه والرواسب والهائمات النباتية) شهريا من ثلاث محطات على نهر الديوانية ابتداء من تشرين الاول 2012 ولغاية ايلول 2013، وشمل | This investigation was designated to study of structural of phytoplankton and its relationship with environmental conditions and some of heavy metal in AL - Diwaniya river, the samples were collected monthly for water, sediments and phytoplankton from October 2012 till September 2013, the study included the measurement of the temperature of air and water; Light penetration; salinity ;electrical conductivity ; T.S.S;T.D.S ;Turbidity; pH ;Oxygen Dissolved; Biological Oxygen Demand ;Chemical Oxygen demand ;Dioxide carbon ;AL - alkalinity; Hardness; Ca; Mg; and nutrients(nitrate; nitrite; phosphate) ; total organic carbon) and the study also included the measurement of some heavy metals (Cadmium, lead, copper, Zinc) in dissolved and particular parts of water and in sediment both exchangeable and residual parts and also studied the structure of phytoplankton quantity and quality.Results of the study showed that the temperature of air and water ranged between (15 - 43) ?C (13 - 33)?C respectively. It was found the light penetration ranged from (27.2 - 100), conductivity was (1264 - 1555)?S/cm, while the salinity was (0.80 - 0.99)%, pH was ranged between (7.37 - 7.82), while Turbidity was ranged between(43.6 - 59.02) NTU, total dissolve substances was (985 - 1411) mg/L while total suspend solid substances was (40 - 66) mg/l. The dissolved Oxygen was within the range of (6.3 - 8.26) mg/l, the biochemical and chemical Oxygen demand was (1.19 - 3.08) mg/l (12.4 - 38.01) mg/l respectively while dioxide carbon was ranged(80.5 - 134.2)mg/l.The study revealed that the river water was alkalinity and very hard, as the range of total alkalinity, total hardness, Calcium and magnesium was (131.5 - 227.4, 312.3 - 458.5, 86.4 - 142, 54.8 - 76.8) mg/ respectively, while the concentrations of the nutrients were showed fluctuated in concentrations, it was (102.6 - 558.4, 1.5 - 3.4, ND - 2.9) ?g/ for Nitrate, Nitrite and Phosphate respectively, total organic carbon was between (0.13 - 0.55) %Seven units were diagnosed during the period of study Bacillriophyceae; Chlorophyceae; Cyanophyceae; Euglenophycae; Dinophycae; Chrysophycae ;Cryptophyceae.Species number of phytoplankton that identified through study period were (134, 101, 96) in three sites respectively, and showed that dominance of Bacillriophyceae (diatoms) which was (71, 50, 46) species fallowed by Chlorophyceae (35, 25, 25) species then Cyanophycae (22, 18, 20) species, Euglenophycae (2, 5, 2) species and Dinophycae(2, 3, 1) species Chrysophycae (1, 0, 2) and finally Cryptophyceae (1, 0, 1)species in three sites respectively,. Generally the most common genera in study period are (Nitzschia, Surirella, Nivicula, Navicula, Syndra, Pediastrum, Scenedesmus, Aphanocapsa, Microcystis, Cocconeis, ,).The total number of phytoplankton was low and ranged between (422.21 - 1027.82) cell ?103/l. This study determined means of heavy metals (Cd, Zn, pb, Cu) in dissolved part was (ND - 5, 4.07 - 29.8 ND - 6.89, 2.08 - 8. 71) ?g/l respectively, while particulate part was) 2.09 - 30.16, 44.87 - 372.17, 3.13 - 90.93, 27.41 - 88.20) ?g/g respectively The study revealed also that the concentrations of heavy metals in sedimentswas (ND - 12.71, 11.76 - 39.93, 0.55 - 6.12, 9.31 - 39.73), ?g/g of exchangeable parts and was (1.09 - 17.94, 39.21 - 172.30, 21.21 - 67.96, 33.96 - 76.63) ?g/g of residual parts respectively. The Statistical results showed there are morale differences between locations and seasons in relation to physical and chemical features, organic compounds, heavy metals and phytoplankton. There are negative and positive, morale correlations between phytoplankton and physical, chemical features and heavy metals that measured during study period at probability at the level of (p<0.05).
