| Sources and transport of nitrate constrained by the isotopic technique in a karst catchment: an example from Southwest China | |
Fu-Jun Yue; Si-Liang Li ; Cong-Qiang Liu
| |
| 2015 | |
| Source Publication | Hydrological Processes
 |
| Volume | 29Issue:8Pages:1883-1893 |
| Abstract | The concentration and isotopic composition of nitrate were analyzed to improve an understanding of nitrate sources and transformation processes in a typical karstic agricultural field in the Houzhai catchment, Guizhou Province, Southwest China. The results revealed that no distinct spatial pattern of content and isotopic composition of nitrate exists in this karst catchment. Nitrate in surface stream (SFS) had slightly lighter isotopic composition and lower concentration compared with nitrate in subterranean stream (STS) during the dry season. Concentrations of SFS nitrate increased to concentrations similar to those of STS during the wet season. The isotopic values indicated that nitrate were mainly impacted by manure sources during the dry season and influenced by a mix of chemical fertilizer and manure during the wet season. The denitrification rates were roughly estimated based on the isotopic compositions of nitrate after considering volatilization and ignoring assimilation. The calculated result showed that approximately one fifth of nitrate load was removed by denitrification in the catchment. Annual nitrate flux from the outlets accounted for 14.2% of applied total fertilizers used in the catchment, approximately 85% of total transported flux from the catchment in the wet season. Furthermore, chemical weathering processes were enhanced by using nitrogen fertilizer because liberated protons and enhanced HCO3- flux were produced through by nitrification. |
| Keyword | Dry Season Nitrogen Fertilizers Hydrology Streams Weat |
| Subject Area | 环境地球化学 |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/5941 |
| Collection | 环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文 环境地球化学国家重点实验室 |
| Recommended Citation GB/T 7714 | Fu-Jun Yue,Si-Liang Li,Cong-Qiang Liu. Sources and transport of nitrate constrained by the isotopic technique in a karst catchment: an example from Southwest China[J]. Hydrological Processes,2015,29(8):1883-1893. |
| APA | Fu-Jun Yue,Si-Liang Li,&Cong-Qiang Liu.(2015).Sources and transport of nitrate constrained by the isotopic technique in a karst catchment: an example from Southwest China.Hydrological Processes,29(8),1883-1893. |
| MLA | Fu-Jun Yue,et al."Sources and transport of nitrate constrained by the isotopic technique in a karst catchment: an example from Southwest China".Hydrological Processes 29.8(2015):1883-1893. |
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