کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5750794 1619693 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Coastal stormwater wet pond sediment nitrogen dynamics
ترجمه فارسی عنوان
پودر نیتروژن رسوبی رسوبات مرطوب دریایی ساحلی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی


- Coastal stormwater ponds are common, but their nitrogen dynamics are understudied.
- Considerable net nitrogen fixation was observed in wet pond sediments during summer.
- Net N2 fluxes were negatively correlated with pond age after NO3−-enrichment.
- Stratification and its effects likely promoted net nitrogen fixation in sediments.
- Wet pond mixing and excavation could increase denitrification during summer.

Wet ponds are a common type of stormwater control measure (SCM) in coastal areas of the southeastern US, but their internal nitrogen dynamics have not been extensively studied. Using flow-through intact sediment core incubations, net sediment N2 fluxes before and after a nitrate addition from five wet ponds spanning a range of ages (3.25-10 years old) were quantified through membrane inlet mass spectrometry during early summer. Multiple locations within a single wet pond (6.16 years old) were also sampled during ambient conditions in late summer to determine the combined effects of depth, vegetation, and flow path position on net N2 fluxes at the sediment-water interface. All pond sediments had considerable rates of net nitrogen fixation during ambient conditions, and net N2 fluxes during nitrate-enriched conditions were significantly correlated with pond age. Following a nitrate addition to simulate storm conditions, younger pond sediments shifted towards net denitrification, but older ponds exhibited even higher rates of net nitrogen fixation. The pond forebay had significantly higher rates of net nitrogen fixation compared to the main basin, and rates throughout the pond were an order of magnitude higher than the early summer experiment. These results identify less than optimal nitrogen processing in this common SCM, however, data presented here suggest that water column mixing and pond sediment excavation could improve the capacity of wet ponds to enhance water quality by permanently removing nitrogen.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volume 609, 31 December 2017, Pages 672-681
نویسندگان
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