مقارنة قدرة ثلاثة أنواع نباتية مزروعة في أتوستراد الثورة (مدينة اللاذقية) على امتصاص عنصر الرصاص ومراكمته (Pb)
Abstract
هدفت هذه الدراسة إلى مقارنة قدرة ثلاثة أنواع نباتية تضم: الدفلة (Nerium oleander Linn.), ونخيل الواشنطونيا (Washingtonia filifera H. Wendl.) والجاكرندا (Jacaranda mimosaefolia D. Don.) مزروعة في منصف وأرصفة أوتوستراد الثورة في مدينة اللاذقية, على امتصاص ومراكمة عنصر الرصاص الناتج بشكل رئيسي عن غازات عوادم السيارات. جُمعت العينات النباتية من الأوراق والقلف والخشب للأنواع المدروسة إضافة إلى عينات التربة, وتم تقدير تراكيز عنصر الرصاص فيها باستخدام جهاز التحليل الطيفي بالامتصاص الذري. أظهرت النتائج أن كميات الرصاص المتراكمة في الأجزاء المختلفة للأنواع النباتية المدروسة ترواحت بين (47.76- 6.36 ppm) بالوزن الجاف, إذ كان أعلى تركيز له في قلف وأوراق الدفلة 47.76 ppm و42.60 ppm على التوالي, يليه في قلف نخيل الواشنطونيا 18.49 ppm, بينما كان أدنى تركيز له في أوراق الجاكرندا 6.36 ppm. نستنتج مما سبق تفوق نبات الدفلة في امتصاص هذا العنصر ومراكمته (خاصة في القلف والأوراق) مقارنة بالأنواع الأخرى المدروسة (الجاكرندا ونخيل الواشنطونيا), إضافة إلى أهميتها كمراكم حيوي للرصاص.
The objective of this study was to compare the ability of three plant species (Nerium oleander Linn., Washingtonia filifera H. Wendl., Jacaranda mimosaefolia D. Don) planted in the sidewalks of Althwra highway in Lattakia city, regarding lead absorption and accumulation resulting mainly from transportation exhausts. Samples of leaves, bark, wood and soil were collected, then analyzed using an atomic absorption spectrophotometer. Results showed that the accumulated amounts of lead in different parts of the studied plants species ranged between (47.76- 6.36 ppm) in dry weight (DW), and the highest concentration of lead was in the bark and leaves of Nerium oleander 47.76 ppm, 42.60 ppm respectively, followed by bark of Washingtonia filifera 18.49 ppm. The lowest concentration was in leaves of Jacaranda mimosaefolia 6.36 ppm. The final result showed the superiority of Nerium oleander in absorption and accumulation of lead element (specially in bark and leaves) in comparison with Washingtonia filifera and Jacaranda mimosaefolia, in addition to it's importance as a bioaccumulator of lead.
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