Attenuation of Nitrogen, Phosphorus and E. coli Inputs from Pasture Runoff to Surface Waters by a Farm Wetland: the Importance of Wetland Shape and Residence Time
| العنوان: | Attenuation of Nitrogen, Phosphorus and E. coli Inputs from Pasture Runoff to Surface Waters by a Farm Wetland: the Importance of Wetland Shape and Residence Time |
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| المؤلفون: | Margaret A. Bellingham, Gareth B. van Assema, Karin Müller, Ron Ovenden, Robert J. Wilcock |
| المصدر: | Water, Air, & Soil Pollution. 223:499-509 |
| بيانات النشر: | Springer Science and Business Media LLC, 2011. |
| سنة النشر: | 2011 |
| مصطلحات موضوعية: | Hydrology, geography, Environmental Engineering, geography.geographical_feature_category, Denitrification, Ecological Modeling, Drainage basin, Wetland, Pollution, Anoxic waters, Most probable number, Environmental chemistry, Environmental Chemistry, Environmental science, Nitrification, Surface runoff, Water Science and Technology, Riparian zone |
| الوصف: | Water quantity and quality were monitored for 3 years in a 360-m-long wetland with riparian fences and plants in a pastoral dairy farming catchment. Concentrations of total nitrogen (TN), total phosphorus (TP) and Escherichia coli were 210–75,200 g N m−3, 12–58,200 g P m−3 and 2–20,000 most probable number (MPN)/100 ml, respectively. Average retentions (±standard error) for the wetland over 3 years were 5 ± 1%, 93 ± 13% and 65 ± 9% for TN, TP and E. coli, respectively. Retentions for nitrate–N, ammonium–N, filterable reactive P and particulate C were respectively −29 ± 5%, 32 ± 10%, −53 ± 24% and 96 ± 19%. Aerobic conditions within the wetland supported nitrification but not denitrification and it is likely that there was a high conversion rate from dissolved inputs of N and P in groundwater, to particulate N and P and refractory dissolved forms in the wetland. The wetland was notable for its capacity to promote the formation of particulate forms and retain them or to provide conditions suitable for retention (e.g. binding of phosphate to cations). Nitrogen retention was generally low because about 60% was in dissolved forms (DON and NOX–N) that were not readily trapped or removed. Specific yields for N, P and E. coli were c. 10–11 kg N ha−1 year−1, 0.2 kg P ha−1 year−1 and ≤109 MPN ha−1 year−1, respectively, and generally much less than ranges for typical dairy pasture catchments in New Zealand. Further mitigation of catchment runoff losses might be achieved if the upland wetland was coupled with a downslope wetland in which anoxic conditions would promote denitrification. |
| تدمد: | 1573-2932 0049-6979 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::c19bbd0f05e249ef354a8fb794cb3656 https://doi.org/10.1007/s11270-011-0876-8 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........c19bbd0f05e249ef354a8fb794cb3656 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 15732932 00496979 |
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