مقایسه مقاومت نهال های یکساله شیردار (Acer cappadocicum) و ون (Fraxinus excelsior) تحت خاک های آلوده به فلز سنگین سرب
محورهای موضوعی : ژنتیکهومن عباسی 1 , محمد رضا پورمجیدیان 2 , سید محمد حجتی 3 , اصغر فلاح 4
1 - گروه جنگلداری، دانشکده منابع‌طبیعی، دانشگاه علوم کشاورزی و منابع‌طبیعی ساری، مازندان، ایران.
2 - گروه جنگلداری، دانشکده منابع‌طبیعی، دانشگاه علوم کشاورزی و منابع‌طبیعی ساری، مازندان، ایران.
3 - گروه جنگلداری، دانشکده منابع‌طبیعی، دانشگاه علوم کشاورزی و منابع‌طبیعی ساری، مازندان، ایران.
4 - دانشیار، رشته جنگلداری، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، مازندان، ایران
کلید واژه: رشد, گیاه پالایی, نهال, درختان بومی, فتوسنتز, زی‌توده,
چکیده مقاله :
شناسایی گونه‌های درختی مناسب به‌منظور گیاه پالایی بسیار حائز اهمیت است ولی لازمه آن انجام مطالعات جامع و ارزیابی پتانسیل گونه‌ها است. در این تحقیق به بررسی مقاومت نهال‌های یکساله بومی جنگل‌های شمال ایران، شیردار (Acer cappadocicum) و ون (Fraxinus excelsior) پرداخته شد. در این راستا نهال‌های یکساله دو گیاه در طول یک فصل رویش تحت تاثیر خاک‌های آلوده به سرب با غلظت‌های 0، 100، 200، 300، 400 و 500 میلی‌گرم در کیلوگرم خاک قرار گرفت و شاخص‌های فتوسنتزی از قبیل نرخ فتوسنتز، هدایت‌روزنه‌ای، نرخ تعرق و دی‌اکسید کربن درون روزنه‌ای به انضمام عملکرد رشد و تخصیص زی‌توده نهالها مورد بررسی قرار گرفت. نتایج نشان داد که حضور فلز سنگین سرب در خاک با غلظت‌های بالا سبب کاهش عمکلرد فتوسنتزی دو گیاه می‌شود ولی در این بین اثرات بازدارنده آلودگی در نهال‌های ون کمتر بود. میزان رشد ارتفاع، قطر و همچنین زی‌توده نهال‌های دو گونه متاثر از اثرات سوء سرب کاهش یافت ولی تفاوت قابل تاملی برای دو گونه مشاهده نشد. یافته‌های این تحقیق نشان داد که دو گونه بومی شیردار و ون در شرایط تحقیق حاضر و در طول یک فصل رویش تفاوت قابل ملاحظه‌ای از لحاظ مقاومت به خاک‌های آلوده به سرب نداشتند، ولی بی‌شک می‌توان با اعمال تیمارهای آلودگی شدیدتر در دوره‌های طولانی‌تر تصمیات بهتری را اتخاذ نمود.
Identifying tree species candidate for phytoremediation is very important. However, its prerequisite is conducting comprehensive studies on tree species and evaluation of the plants’ potential. The current research surveyed resistance of two native species of Hyrcanian forest Acer cappadocicum and Fraxinus excelsior at seedling stage. In this regard, one-year old seedlings of both species were grown under different concentrations of lead including 0, 100, 200, 300,400, and 500 milligram lead per kilogram soil during a growth season. During a growth season photosynthetic indexes such as gas exchange, net photosynthesis rate, stomatal conductance, transpiration rate, and substomatal CO2 concentration as well as growth and biomass allocation were studied. The results showed that the presence of lead as a heavy metal led to decline of photosynthesis performance of both species but the inhibitory effects of Pb was less in seedlings of ash. Height and diameter growth as well as seedling biomass of both species were decreased by negative effects of lead but there was no considerable difference between two species. Our finding showed that under the experimental condition, there was no significant difference between resistances of two native species to lead contaminated soil but for making a better decision, further studies are necessary with stronger contamination and for a longer period.
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