Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Dissolved Inorganic Nitrogen Input via Net Nitrogen Mineralization under Antibiotics and Warming from the Water Level Fluctuation Zone of a Three Gorges Tributary
Water ( IF 3.0 ) Pub Date : 2021-09-12 , DOI: 10.3390/w13182502 Junjie Lin , Chang Yan , Dan Liu , Yaling Du , Chunmei Xiong , Xiaoxia Yang , Qingyu Nie
Water ( IF 3.0 ) Pub Date : 2021-09-12 , DOI: 10.3390/w13182502 Junjie Lin , Chang Yan , Dan Liu , Yaling Du , Chunmei Xiong , Xiaoxia Yang , Qingyu Nie
The water level fluctuation (WLF) zone is one of the dominant sources of total dissolved inorganic nitrogen (TDN) export via net nitrogen (N) mineralization in the Three Gorges Reservoir (TGR). However, antibiotics pollution may impact the process of TND exports from WLF zone in the TGR, especially under drying-rewetting processes and climate warming, and thus increasing the risk of eutrophication in the tributaries of the TGR. The effects of the antibiotics Griseofulvin (GIN) and Fosfomycin (FIN) with 0, 0.2 and 0.4 g kg−1 net N mineralization rate (NMR) from WLF-zone soil in the Pengxi river, a typical tributary of the Yangtze River, under 25 and 35 °C were estimated in 30−day flooding and drying incubations. The results showed that GIN concentrations, temperatures and their interaction significantly affect net-nitrification rates (NNR) and NMR under drying and did not significantly affect NNR under flooding. FIN concentrations and temperatures solely influenced the NNR under flooding. The amounts of TDN exports via NMR without antibiotics from the WLF zone of Pengxi River are 6883.8 (flooding, 25 °C), 9987.3 (flooding, 35 °C), 9781.6 (drying, 25 °C), and 27866.5 (drying, 35 °C) t year−1, which is 21.0, 29.8, 30.4 and 84.8 times of the permissible Class A discharge in China according to (GB18918-2002). Thus, the NMR of WLF zone should be controlled whether there is antibiotics pollution or not, especially during the dry period for alleviating water eutrophication. This study will be helpful for the assessment of nitrogen budgets in the WLF zone to eutrophication in the Three Gorges Reservoir.
更新日期：2021-09-12
京公网安备 11010802027423号