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Article
Seasonal Ecological Study for Community of Hydrilla Verticillata in Al-Masehb Marsh, Southern Iraq.

Author: Mohammed A. H. Al-Kenzawi
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2011 Volume: 14 Issue: 3 Pages: 90-98
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

This study was performed in Al-Masehb Marsh, Southern Iraq after its restoration processes during 2007, seasonally. Hydrilla verticillata was identified for the first time in this marsh, then its standing crop biomass and vegetation cover percentage were studied. In addition to some physical and chemical water properties. Whereas, its standing crop biomass was with its peak in summer, its value was 213.5 gm/m2, while the lowest value was 42.7 gm/m2 in winter. Also, the vegetation cover percentage was with its peak in summer, its value was 80 %, while the lowest value was 20 % in winter. T-test program was applied to study the significant differences in the growth between seasons at significance levels (P-value < 0.01) and (P-value < 0.05). Pearson’s product moment correlation coefficient (r) was done to study the relationships between the growth and the studied environmental variables. Statistically, significant differences were shown in the growth between some seasons (winter and summer, winter and autumn, spring and summer; thus spring and autumn). Positive relationships for water temperature and salinity with the growth were observed, while negative relationships were observed for water depth, calcium, magnesium, nitrite, nitrate, and phosphate with Hydrilla verticillata growth.

تمت هذه الدراسة في هور المسحب جنوب العراق بعد عمليات اعادة الأهوار، سنة 2007، بصورة موسمية. Hydrilla verticillata شخص في هذا الهور لأول مرة. درست الكتلة الحية للمحصول القائم والنسبة المئوية للغطا الخضري لمجتمع هذا النوع. فضلا عن بعض المواصفات الفيزيائية والكيميائية للمياه، وجد أن الكتلة الحية كانت بقمتها في فصل الصيف وقيمتها هي 213,5 غم/م2، بينما القيمة الأقل هي 42,7 غم/م2 كانت في الشتاء. كذلك النسبة المئوية للغطاء الخضري كانت بقمتها في الصيف وقيمتها 80 %، بينما القيمة الأقل هي 20 % وكانت في الشتاء. النظام الأحصائي t-test طبق لدراسة الأختلافات المعنوية فـي النمـو بيـن المواسـم عنـد مستويـات معنويـة(P-value < 0.01) و (P-value < 0.05). ومعامل الأرتباط (r) طبق لدراسة العلاقات بين النمو والمتغيرات البيئية المدروسة. أحصائيا، لوحظت اختلافات معنوية في النمو بين بعض المواسم (الشتاء والصيف، الشتاء والخريف، الربيع والصيف، وبين الربيع والخريف). ولوحظت علاقات ارتباط موجبة لدرجة حرارة الماء والملوحة مع النمو، بينما لوحظت علاقات سلبية (عكسية) لعمق الماء، الكالسيوم، المغنيسيوم، النتريت الفعال، النترات الفعـال، والفوسفـات الفعـال مـع نمـو الـ Hydrilla verticillata.الكلمات المفتاحية: Hydrilla verticillata. الكتلة الحية. الغطاء الخضري. الأهوار العراقية.


Article
دراسة بيئة النبات المائي الدخيل Hydrilla verticillata وانتشاره

Author: عبد الرضا اكبر علوان المياح وداد مزبان طاهر الاسدي
Journal: Journal of Basrah Researches (Sciences) مجلة ابحاث البصرة ( العلميات) ISSN: 18172695 Year: 2010 Volume: 36 Issue: 1B Pages: 8-51
Publisher: Basrah University جامعة البصرة

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Abstract

Hydrilla verticillata, (in Arabic Qotel in some area) is an exotic and invested aquatic plant for Iraq. It is recently decovered after inundation of Abo-Zaraq marsh, therefore its ecology and distribution are the amis of this study.The results of this study showed that H. verticillata has different reproductive stratigies and a very high potential of invation of different habitat, and can easly grow and withstand in it. For that reson H. verticillata quickly succeeded to expand its distribution through almost all marshes areas including Shatt Al-Arab water way reaching to Abo Al-Khasib.Cover percent, Biomases and the yield of a year production were determined.

يعد نبات الكطل Hydrilla verticillata (L.f.) Royle نباتاً دخيلاً وغازياً للبيئة المائية في العراق وقد اكتشف بعد عملية إعادة أغمار الاهوار، في هذا البحث دراس بيئياً وتم مراقبة انتشاره وتحددت مناطق توزيعه ونموه ومدى تأثيره البيولوجي والبيئي على النباتات والنظم البيئية في الاهوار الجنوبية. وقد أظهرت النتائج أن للنبات قدرات واستراتيجيات تكاثرية هائلة على غزو المناطق الجديدة والتكيف للنمو في ظروف بيئية مختلفة لذلك استطاع توسيع رقعة انتشاره منذ اكتشافه في نيسان 2004 في هور أبو زرك حتى الآن بشكل سريع جداً وغطي الاهوار كافة وامتد في شط العرب وصولاً إلى أبي الفلوس في أبي الخصيب. كما قيست نسبة الغطاء الخضري والكتلة الحية له وحدد مقدار إنتاجه السنوي.


Article
Environmental study of water quality and some heavy metals in water, sediment and aquatic macrophytas in lotic ecosystem, Iraq

Authors: Marwa Ali Habeeb --- Abdul-Karim Kh. Al-Bermani --- Jasim M.Salman
Journal: Mesopotamia Environmental Journal بيئة وادي الرافدين ISSN: 24102598 Year: 2015 Volume: 1 Issue: 2 Pages: 66-84
Publisher: Babylon University جامعة بابل

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Abstract

This study was respect to detect possible environmental effects on the eastern Euphrates drainage from the Abo-Garak to south of Kifil city in Babylon province. Five sites were selected along the study area and Omit it during October 2013 to August 2014. Physical and chemical properties are measured (air and water temperature , pH , electrical conductivity , salinity, TDS ,TSS , BOD5, dissolved oxygen , Alkalinity , Total Hardness , calcium , magnesium ) and nutrients (nitrite , nitrate , reactive phosphate) as well as . The average of the studied heavy metals Fe , Cd , Pb and Cu the dissolved phase of water were 113.89 , 6.35 , 1.5 and 0.8μg /l for Fe , Cd , Pb and Cu , respectively .Heavy metals concentrations in the particulate form were 291.83, 9.39, 3.07 and 12.15 μg/g dry weight for Fe , Cd , Pb and Cu respectively. In the sediments, the concentrations of these heavy metals in the exchangeable phase were 318.66, 12.91, 6.27 and 13.23μg/g for Fe , Cd , Pb and Cu , respectively. While in the residual phase were 461.53, 5.29, 8.62 and 27.07 μg/g for Fe , Cd , Pb and Cu , respectively . The results revealed that the concentrations of heavy metals in water for the particulate phase were higher than in the dissolved phase , while in sediment, their concentrations in the residual phase were higher than their concentrations in the exchangeable phase except for Cd which was in the exchangeable phase higher than in the residual phase. The concentration and distribution of heavy metals in macrophytes Ceratophyllum demersum were (923.63 , 462.34 , 740.45 and 90.59)μg/g dry weight for Fe , Cd , Pb and Cu , respectively . While , (728.57, 162.17 , 244.13 and 118.87) μg/g dry weight for Fe , Cd , Pb and Cu , respectively. for Fe , Cd , Pb and Cu in Hydrilla verticillata . The study area was very hard water and high BOD5. The nutrients showed clear seasonal variation in their concentration

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