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Sediment pollution and nitrogen release at the sediment‐water interface in Changjiang River and its tributary, the lower Han River Basin
Author(s) -
Yuan Jie,
Zhong Xinlin
Publication year - 2020
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/wej.12569
Subject(s) - tributary , sediment , environmental science , drainage basin , pollution , hydrology (agriculture) , nitrogen , water pollution , surface water , environmental chemistry , geology , ecology , environmental engineering , geomorphology , chemistry , geography , biology , cartography , geotechnical engineering , organic chemistry
Surface and core sediments were investigated in the lower Han River Basin, a tributary of Changjiang River in China to evaluate the nitrogen (N) pollution of sediments and N fluxes as well as their influencing factors at the sediment‐water interface. Two methods of sediment pollution assessment were applied and the results showed that the sediment at site H9 was the most contaminated and that at site H4 and H7 was almost unpolluted. pH was significantly and positively correlated with total nitrogen (TN) content and NH 4 + flux ( P < 0.05), indicating that N fluxes could be related to environmental factors. NO 3 - was generally from out of the sediment and into water, while NH 4 + diffused into sediment from water at some sites. Overall, the N fluxes were extremely high, revealing the considerable risk in internal N release. It is of great importance to strengthen the ecological restoration and control the internal N release.