期刊
WATER SCIENCE AND TECHNOLOGY
卷 63, 期 11, 页码 2553-2559出版社
IWA PUBLISHING
DOI: 10.2166/wst.2011.537
关键词
nitrogen isotope; nitrogen pollution; seasonal variation; transformation; urban river
资金
- National Natural Science Foundation of China [50979007]
- China Foundation [2008ZX07209-007]
Urban rivers are essential in retaining nutrients, but little is known about nitrogen cycling in these rivers in semiarid areas. We measured chemical and isotopic compositions of ammonium (NH(4)(+)-N) and nitrate (NO(3)(-)-N) to investigate spatial-temporal variation of nitrogen cycling in the Fuhe River in the North China Plain. Nitrogen pollution in the river was mainly induced by extra NH(4)(+)-N inputs which come from the discharges of urban sewage and effluents of wastewater treatment plants in upstream. NH(4)(+)-N obtained from decomposing organic matter of sediments can diffuse into the overlying water. Intense nitrification then occurs at the terrestrial-aquatic interface. Due to less vegetation in spring and autumn, loss of NH(4)(+)-N is mainly caused by nitrification. In contrast, significant NH(4)(+)-N is absorbed by plants in summer. NO(3)(-)-N generated from nitrification can be denitrified during the study period. The highest NO(3)(-)-N loss (about 86.3%) was observed in summer. The contribution of NO(3)(-)-N loss due to denitrification is 44.6%. The remaining 55.4% is due to plant uptake. The results suggested that nitrogen cycling in the river is related to temperature and dry-wet cycles. And vegetation restoration along the river could benefit the incremental improvements to the aquatic ecosystem.
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