How do nitrogen inputs to the Changjiang basin impact the Changjiang River nitrate: A temporal analysis for 1968-1997
文献类型：SCI/SSCI论文
| 作者 | Yan W. J. ; Zhang S. ; Sun P. ; Seitzinger S. P. |
| 发表日期 | 2003 |
| 关键词 | anthropogenic effects Changjiang River nitrate world rivers yangtze-river fixation china terrestrial ecosystems budgets carbon saturation transport |
| 英文摘要 | [1] We present estimates of nitrogen (N) inputs to the Changjiang River basin for the period 1968 - 1997. The total N input is approximately 7.8 x 10(9) kg in 1997, which is a threefold increase over 1968 levels. N fixation was often a dominant input before 1978, providing about 2.2 x 10(9) kg year(-1), while N fertilizer dominated N input after 1983, supplying an additional input of some 4.4 x 10(9) kg year(-1). More than 40% of total N inputs is converted into manure N, and half of total manure N is returned to agricultural soil. We estimate that the river nitrate concentration and flux have increased about tenfold from 1968 to 1997. Our study suggests that the percent of N inputs to the basin that are exported by the river as NO3-N has increased steadily over the 30-year period and that about 30% of total N input is transported through the river. The integrated N input, budget, and storage have been linked to the increasing temporal trends of Changjiang River nitrate. N fertilizer application and human population density, as well as manure N production in the basin, are good predictors of the river's nitrate concentration and flux. Therefore, how N balance is kept ( especially for effective application of N fertilizer) is a crucial problem to the sustainable development of the basin. |
| 出处 | Global Biogeochemical Cycles |
| 卷 | 17 |
| 期 | 4 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0886-6236 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/22622]  |
| 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.,Zhang S.,Sun P.,et al. How do nitrogen inputs to the Changjiang basin impact the Changjiang River nitrate: A temporal analysis for 1968-1997. 2003. |
入库方式： OAI收割
来源：地理科学与资源研究所
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