Land use impact on nitrogen discharge by stream: a case study in subtropical hilly region of China
文献类型：期刊论文
| 作者 | Yang, Jin-Ling; Zhang, Gan-Lin; Zhao, Yu-Guo |
| 刊名 | NUTRIENT CYCLING IN AGROECOSYSTEMS
 |
| 出版日期 | 2007 |
| 卷号 | 77期号:1页码:29-38 |
| 关键词 | watershed land use nitrogen stream water nutrient discharge |
| ISSN号 | 1385-1314 |
| DOI | 10.1007/s10705-006-9022-1 |
| 通讯作者 | Zhang, Gan-Lin(glzhang@issas.ac.cn) |
| 英文摘要 | As a crucial factor of water eutrophication, nitrogen (N) discharge by agricultural non-point sources (NPS) has become a worldwide concern, and so has its relationship to land use. This study was aimed at the quantitative relationships between N discharge by stream and land use. It was conducted in the Meicun watershed of Xuancheng County, Anhui Province, in the subtropical low hilly area of China. The study integrated dynamic monitoring of nutrient discharge by stream water and Geographic Information Systems (GIS) analysis of land use of the watershed. Results showed that NO3--N discharge ranged between 50 and 60% of the total nitrogen (T-N) and was 2.5 - 3.0 times as much as NH4+-N. There was a significant difference between forested and mixed sub-watersheds for NH4+-N, NO3--N and T-N concentrations. Significant correlations existed between NH4+-N, NO3--N and T-N concentrations in stream water and the area percentages of forest and paddy fields. The study found that the discharges of NH4+-N, NO3--N and T-N decreased exponentially with forest area increase, but a steep decline for NO3--N and T-N seemed to occur when the forest percentage surpassed 70% and then there was almost no change. Similarly, the discharges of NH4+-N, NO3--N and T-N increased exponentially with the paddy fields increase, but a steep augmentation occurred for NO3--N and T-N when the paddy percentage surpassed 20% and then it remained at a plateau. The study showed that in the subtropical hilly region, paddy fields could increase N discharge due to farming management practices. Thus, primary measures to reduce N in the receiving water body would include a change in farming management and building an ecological interception system for paddy fields. |
| 收录类别 | SCI |
| WOS关键词 | SURFACE-WATER QUALITY ; NORTH-CAROLINA ; PHOSPHORUS ; SYSTEMS ; CATCHMENT ; RUNOFF ; RIVER ; NUTRIENTS ; TRANSPORT ; POLLUTION |
| WOS研究方向 | Agriculture |
| WOS类目 | Soil Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000243623100003 |
| 出版者 | SPRINGER |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2558724 |
| 专题 | 南京土壤研究所 |
| 通讯作者 | Zhang, Gan-Lin |
| 作者单位 | Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Jin-Ling,Zhang, Gan-Lin,Zhao, Yu-Guo. Land use impact on nitrogen discharge by stream: a case study in subtropical hilly region of China[J]. NUTRIENT CYCLING IN AGROECOSYSTEMS,2007,77(1):29-38. |
| APA | Yang, Jin-Ling,Zhang, Gan-Lin,&Zhao, Yu-Guo.(2007).Land use impact on nitrogen discharge by stream: a case study in subtropical hilly region of China.NUTRIENT CYCLING IN AGROECOSYSTEMS,77(1),29-38. |
| MLA | Yang, Jin-Ling,et al."Land use impact on nitrogen discharge by stream: a case study in subtropical hilly region of China".NUTRIENT CYCLING IN AGROECOSYSTEMS 77.1(2007):29-38. |
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来源：南京土壤研究所
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