Increasing anthropogenic nitrogen inputs and riverine DIN exports from the Changjiang River basin under changing human pressures
文献类型：SCI/SSCI论文
| 作者 | Yan W. J. ; Mayorga E. ; Li X. Y. ; Seitzinger S. P. ; Bouwman A. F. |
| 发表日期 | 2010 |
| 关键词 | nitrate fluxes water denitrification tributaries ecosystems saturation catchment budgets impact |
| 英文摘要 | In this paper, we estimate the inputs of nitrogen (N) and exports of dissolved inorganic nitrogen (DIN) from the Changjiang River to the estuary for the period 1970-2003, by using the global NEWS-DIN model. Modeled DIN yields range from 260 kg N km(-2) yr(-1) in 1970 to 895 kg N km(-2) yr(-1) in 2003, with an increasing trend. The study demonstrated a varied contribution of different N inputs to river DIN yields during the period 1970-2003. Chemical fertilizer and manure together contributed about half of the river DIN yields, while atmospheric N deposition contributed an average of 21% of DIN yields in the period 1970-2003. Biological N fixation contributed 40% of DIN yields in 1970, but substantially decreased to 13% in 2003. Point sewage N input also showed a decreasing trend in contribution to DIN yields, with an average of 8% over the whole period. We also discuss possible future trajectories of DIN export based on the Global NEWS implementation of the Millennium Ecosystem Assessment scenarios. Our result indicates that anthropogenically enhanced N inputs dominate and will continue to dominate river DIN yields under changing human pressures in the basin. Therefore, nitrogen pollution is and will continue to be a great challenge to China. |
| 出处 | Global Biogeochemical Cycles |
| 卷 | 24 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0886-6236 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/22625]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Yan W. J.,Mayorga E.,Li X. Y.,et al. Increasing anthropogenic nitrogen inputs and riverine DIN exports from the Changjiang River basin under changing human pressures. 2010. |
入库方式： OAI收割
来源：地理科学与资源研究所
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