کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7477656 | 1485203 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The effect of water velocity on nitrate removal in vegetated waterways
ترجمه فارسی عنوان
اثر سرعت آب بر روی حذف نیترات در آبیاری های گیاهی
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
چکیده انگلیسی
The extended networks of canals and ditches in agricultural landscapes provide high buffer capacity towards nitrogen (N) excess. Their N mitigation potential depends on several biotic and abiotic factors, among which water velocity is poorly explored and generally omitted from the parameterization of this remarkable ecosystem service. The present work reports new insights on the role of flow velocity in regulating N removal via denitrification in sediments colonized by Phragmites australis. Denitrification was investigated in outdoor mesocosms in the presence and absence of P. australis and over a small range of flow velocity (0-6â¯cmâ¯sâ1) typical of low-gradient water bodies. Simultaneous measurements of NO3â consumption and N2 production based on analyses of N2:Ar by Membrane Inlet Mass Spectrometry were undertaken. Vegetated sediments were found more efficient in converting NO3â to N2 via microbial-mediated denitrification (27-233â¯mmolâ¯Nâ¯mâ2 dâ1) than bare sediments (18-33â¯mmolâ¯Nâ¯mâ2 dâ1). Vegetation provides multiple interfaces, i.e. in the rhizosphere and on epiphytic biofilms, that support the development and activity of bacterial communities responsible for NO3â dissipation. NO3â removal and denitrification rates exhibited one order of magnitude raise when water velocity passed from 0 to 6â¯cmâ¯sâ1 in vegetated sediments. Indeed, in slow-flow vegetated waterways denitrification may be physically limited and the increase of water velocity enhances the rate of NO3â supply through the diffusive boundary layer, thereby promoting its consumption and loss from the system. Water velocity should be taken into account as a key factor for management and restoration actions aimed at maximizing the NO3â buffer capacity of low-flow drainage networks.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Management - Volume 215, 1 June 2018, Pages 230-238
Journal: Journal of Environmental Management - Volume 215, 1 June 2018, Pages 230-238
نویسندگان
Giuseppe Castaldelli, Vassilis Aschonitis, Fabio Vincenzi, Elisa Anna Fano, Elisa Soana,