Nitrogen budget in the Changjiang River drainage area
文献类型：CNKI期刊论文
| 作者 | Jiang T(江涛); Yu ZM(俞志明) ; Song XX(宋秀贤); Cao XH(曹西华)
|
| 发表日期 | 2012-07-15 |
| 出处 | Chinese Journal of Oceanology and Limnology
 |
| 关键词 | nitrogen budget eutrophication Changjiang (Yangtze) River drainage area riverine nitrogen transport |
| 英文摘要 | We established a budget model of nitrogen (N) inputs and outputs between watersheds and waterbodies to determine the sources of riverine N in the Changjiang (Yangtze) River drainage area. Nitrogen inputs in the budget included N from synthetic fertilizer, biological fixation by leguminous and other crops, wet/dry atmospheric deposition, excreta from humans and animals, and crop residues. The total N input was estimated to be 17.6 Tg, of which 20% or 3.5 Tg N was transported into waterbodies. Of the total N transported into waterbodies, the largest proportion was N from animal waste (26%), followed by N from atmospheric wet/dry deposition (25%), synthetic fertilizer N (17%), N in sewage wastes (17%), N in human waste from rural areas (6%) and industrial wastewater N (9%). We studied the spatial patterns of N inputs and outputs by dividing the Changjiang River drainage area into four sub-basins, from upstream to downstream: the Tongtian River drainage area (TTD, the headwater drainage area, 138 000 km 2 , less disturbed by human activities); the Jinsha River drainage area (JSD, 347 000 km 2 , less disturbed by human activities, approx. 3 500 km upstream of the Changjiang estuary); the Pingshan-Yichang drainage area (PYD, 520 500 km 2 , large-scale human disturbance, about 2 000 km upstream of the Changjiang estuary); and the Yichang-Datong drainage area (YDD, 699 900 km 2 , large-scale human disturbance, approx. 620 km upstream of the Changjiang estuary). The average N input into waterbodies was 2.3, 7.3, 24.1, and 28.2 kg N/ha in the TTD, JSD, PYD, and YDD sub-basins, respectively, suggesting an increase of N-components of more than 10 times from upstream to downstream areas. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | Supported by the Knowledge Innovation Program of Chinese Academy of Sciences (No.KZCX2-YW-Q07-02) ; the National Basic Research Program of China (973Program)(No.2010CB428706) ; the Fund for Creative Research Groups of NSFC(No.41121064) ; the National Natural Science Foundation of China (No.41106090) |
| 卷 | v.30期:04页:150-163 |
| 语种 | 英文; |
| 分类号 | X522 |
| ISSN号 | 0254-4059 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/191188]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.ResearchCenterforHarmfulAlgaeandMarineBiology,JinanUniversity 2.KeyLaboratoryofMarineEcologyandEnvironmentalSciences,InstituteofOceanology,ChineseAcademyofSciences |
| 推荐引用方式 GB/T 7714 | Jiang T,Yu ZM,Song XX,et al. Nitrogen budget in the Changjiang River drainage area. 2012. |
入库方式： OAI收割
来源：海洋研究所
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