Atmospheric Reactive Nitrogen Deposition from 2010 to 2021 in Lake Taihu and the Effects on Phytoplankton

• DOI: 10.1021/acs.est.2c09434
• Publication Date: 2023-05-15T13:35:08Z
• Authors: Jianming Deng; Wei Nie; Xin Huang; Aijun Ding; Boqiang Qin; Congbin Fu
• Keywords: Deposition; Reactive nitrogen

The effects of nitrogen deposition reduction on nutrient loading in freshwaters have been widely studied, especially remote regions. However, understanding the ecological is still rather limited. Herein, we re-estimated deposition, both wet and dry Lake Taihu with monthly monitoring data from 2010 to 2021. Our results showed that atmospheric reactive (namely NH4+ NO3-) was 4.94-11.49 kton/yr, which equaled 13.9%-27.3% riverine loading. Dry NO3- contributed 53.1% bulk Taihu. Ammonium main component may due strong agriculture-related activities around Nitrogen explained 24.9% variation phytoplankton community succession 2021 highest among all environmental factors. Atmospheric offset external during early years delayed emergence nitrogen-fixing cyanobacterial dominance implied a decrease fertilizer use, could limit diatoms promote non-nitrogen-fixing dominance, followed by taxa. This result also applied other shallow eutrophic lakes middle lower reaches Yangtze River, where significant use recorded last decades.