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DOI10.1007/s11356-018-3716-1
Dissolved oxygen stratification changes nitrogen speciation and transformation in a stratified lake
Su, Xiaoxuan1,2; He, Qiang1,2; Mao, Yufeng1,2; Chen, Yi1,2; Hu, Zhi1,2
发表日期2019
ISSN0944-1344
EISSN1614-7499
卷号26期号:3页码:2898-2907
英文摘要

Dissolved oxygen (DO) stratification is a natural phenomenon in lakes, which potentially influences nitrogen (N) biogeochemical cycle. However, the specific effects of DO stratification on N speciation and transformation behaviors in different water layers are still poorly understood. Here, we reported that DO stratification remarkably influenced N species and transformation pathways in different water columns by high frequency sampling during summers in Longjing Lake, China. Results showed that DO stratification in the lake created three water layers: epilimnion (1-3m), oxycline (4-11m), and hypolimnion (12-20m). In the epilimnion, N speciation was mainly controlled by phytoplankton assimilation and organic N dominated in this layer. Oxycline was the major place for N transformations and had the most notable N removal capacity (714kgN from June to August). In the hypolimnion, NH4+ was the major N species, and sediment release contributed nearly 85% hypolimnetic NH4+. Furthermore, approximately 8kg of dissolved N2O was also accumulated in the hypolimnion, contributing similar to 70% of N2O in the whole lake. Overall, our results indicated that DO stratification caused the shifts in N speciation and transformation behaviors among different water columns, which may have a great implication for lake managements for providing separated protection strategies from different water depths.


WOS研究方向Environmental Sciences & Ecology
来源期刊ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/91686
作者单位1.Chongqing Univ, Minist Educ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, Chongqing 400045, Peoples R China;
2.Chongqing Univ, Coll Urban Construct & Environm Engn, Chongqing 400045, Peoples R China
推荐引用方式
GB/T 7714
Su, Xiaoxuan,He, Qiang,Mao, Yufeng,et al. Dissolved oxygen stratification changes nitrogen speciation and transformation in a stratified lake[J],2019,26(3):2898-2907.
APA Su, Xiaoxuan,He, Qiang,Mao, Yufeng,Chen, Yi,&Hu, Zhi.(2019).Dissolved oxygen stratification changes nitrogen speciation and transformation in a stratified lake.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,26(3),2898-2907.
MLA Su, Xiaoxuan,et al."Dissolved oxygen stratification changes nitrogen speciation and transformation in a stratified lake".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 26.3(2019):2898-2907.
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