| 论文编号: | |
| 论文题目: | Export of dissolved nitrogen in catchments underlain by permafrost in northeast China |
| 英文论文题目: | Export of dissolved nitrogen in catchments underlain by permafrost in northeast China |
| 第一作者: | 郭跃东 |
| 英文第一作者: | Yu D.Guo |
| 联系作者: | 宋长春 |
| 英文联系作者: | Chang C.Song |
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| 发表年度: | 2019 |
| 卷: | 660 |
| 期: | |
| 页码: | 1210-1218 |
| 摘要: | Eurasianpermafrostserves as an important nitrogen source for linked aquatic and oceanic ecosystems. To fill in the data gaps in the southern margin of the Eurasian permafrost, nitrogen dynamics in the two rivers that drain the permafrost in the Great Xing'an Mountains of northeast China were investigated during the 2012–2015 growing seasons. The mean concentration of total dissolved nitrogen (TDN) in the two catchments was 0.63？mg？L？1, which is generally higher than other permafrost catchments around theArctic Ocean. Thedissolved organic nitrogen(DON) constituted the majority of TDN, and the mean DON:TDN ratio was as high as 0.84. The seasonal flood patterns broadly influenced the concentrations and annual loads of DON, as well as thedissolved organic carbon(DOC):DON ratios in the two rivers.River dischargewas positively related to DON concentration during growing seasons, while the concentrations ofdissolved inorganic nitrogen(DIN), namelyammoniumandnitrate, demonstrated no relationship with discharge. The estimated annual TDN yield, 190？kg？km？2？yr？1on average, was much higher than in the large Arctic rivers that drain permafrost. This yield accounts for 42.7% of the totalatmosphericnitrogen deposition in the study area, which indicates a great potential for dissolved nitrogen export from the permafrost area in the Great Xing'an Mountains. |
| 英文摘要: | Eurasianpermafrostserves as an important nitrogen source for linked aquatic and oceanic ecosystems. To fill in the data gaps in the southern margin of the Eurasian permafrost, nitrogen dynamics in the two rivers that drain the permafrost in the Great Xing'an Mountains of northeast China were investigated during the 2012–2015 growing seasons. The mean concentration of total dissolved nitrogen (TDN) in the two catchments was 0.63？mg？L？1, which is generally higher than other permafrost catchments around theArctic Ocean. Thedissolved organic nitrogen(DON) constituted the majority of TDN, and the mean DON:TDN ratio was as high as 0.84. The seasonal flood patterns broadly influenced the concentrations and annual loads of DON, as well as thedissolved organic carbon(DOC):DON ratios in the two rivers.River dischargewas positively related to DON concentration during growing seasons, while the concentrations ofdissolved inorganic nitrogen(DIN), namelyammoniumandnitrate, demonstrated no relationship with discharge. The estimated annual TDN yield, 190？kg？km？2？yr？1on average, was much higher than in the large Arctic rivers that drain permafrost. This yield accounts for 42.7% of the totalatmosphericnitrogen deposition in the study area, which indicates a great potential for dissolved nitrogen export from the permafrost area in the Great Xing'an Mountains. |
| 刊物名称: | Science of the Total Environment |
| 英文刊物名称: | Science of the Total Environment |
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| 参与作者: | Y. D. Guo, C. C. Song, W. W. Tan, X. W. Wang and Y. Z. Lu |
| 英文参与作者: | Y. D. Guo, C. C. Song, W. W. Tan, X. W. Wang and Y. Z. Lu |
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Export of dissolved nitrogen in catchments underlain by permafrost in northeast China
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