Evidence of temperature-controlled dissolved inorganic nitrogen distribution in a shallow lake  

作　　者：Yan Wen Wenqiang Zhang Baoqing Shan Jie Qu 

机构地区：[1]Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Environmental Sciences》2022年第12期105-114,共10页环境科学学报（英文版）

基　　金：supported by the Youth Innovation Promotion Association CAS (Wenqiang Zhang, 2018058);the Key-Area Research and Development Program of Guangdong Province (No. 2019B110205002)。

摘　　要：Dissolved inorganic nitrogen(DIN) plays an important role in aquatic ecosystems as an available source of nitrogen(N). Despite recent advances in our understanding of the effects of climate change on DIN in coastal waters, shallow high-latitude lakes exposed to large seasonal temperature differences have received limited research attention. Therefore,in the present study, Baiyangdian Lake(BYDL) was selected as the study area, as a typical high latitude shallow lake in North China. Based on water and sediment samples collected in spring, summer and winter seasons, DIN accumulation in sedimentary pore water and DIN diffusion fluxes at the sediment-water interface were quantified under different temperature conditions. Correlation analysis was used to establish the effects of temperature on DIN concentration and diffusion in different media. Results show that the diffusion of DIN at the lake sediment-water interface exhibited a strongly positive relationship with temperature, suggesting that high temperature conditions lead to greater DIN release from sediments. Cold temperatures cause DIN accumulation in sedimentary pore water, providing sufficient substrate for N-related bacteria in the sediment under cold temperature conditions. Temperature controls the vertical distribution of DIN by affecting its migratory diffusion and transformation at the sediment-water interface. These findings are valuable for understanding the impact of climate change on the distribution of N in inland shallow lakes,especially in high latitude shallow lakes subjected to large seasonal temperature differences throughout the year.

关 键 词：Shallow lake TEMPERATURE Dissolved inorganic nitrogen Vertical distribution Diffusion flux 

分 类 号：X524[环境科学与工程—环境工程]