کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1738077 1521604 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Vegetation composition and 226Ra uptake by native plant species at a uranium mill tailings impoundment in South China
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
Vegetation composition and 226Ra uptake by native plant species at a uranium mill tailings impoundment in South China
چکیده انگلیسی


• Vegetation composition of native plant species at an impoundment was analyzed.
• 226Ra uptake by native plant species at the impoundment was investigated.
• Poaceae and Asteraceae were the dominated families colonizing this impoundment.
• The plant species and composition were related to activities of 226Ra and pH.
• Three plant species were found to be hyperaccumulators for 226Ra.

A field investigation was conducted for the vegetation composition and 226Ra uptake by native plant species at a uranium mill tailings impoundment in South China. 80 species belonging to 67 genera in 32 families were recorded in the sampling sites. The Poaceae and Asteraceae were the dominant families colonizing the impoundment. The number of the plant species and vegetation community composition in the sampling sites seemed most closely related to the activities of 226Ra and the pH value of the uranium tailings. The plant species in the sampling sites with relatively low activities of 226Ra and relatively high pH value formed a relatively stable vegetation community. The plant species in the sampling sites with medium activities of 226Ra and medium pH value formed the transitional vegetation community. The plant species in the sampling sites with relatively high activities of 226Ra and relatively low pH value formed a simple unstable vegetation community that was similar to that on the unused grassland. The activities of 226Ra and transfer factors (TFs) varied greatly with the plant species. The high activities of 226Ra and TFs were found in the leaves of Pteris multifida (150.6 Bq/g of AW; 9.131), Pteridium aquilinum (122.2 Bq/g of AW; 7.409), and Dryopteris scottii (105.7 Bq/g of AW; 6.408). They satisfied the criteria for a hyperaccumulator for 226Ra. They may be the candidates for phytoremediation of 226Ra in the uranium mill tailings impoundment areas and the contaminated soils around.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Radioactivity - Volume 129, March 2014, Pages 100–106
نویسندگان
, , , , , , ,