NO3- sources and circulation in the shallow vadose zone in the edge of Dunhuang Mingsha sand dunes in an extremely arid area of Northwestern China
文献类型：期刊论文
| 作者 | Qi, Shi1,2,3; Ma, Jinzhu2; Feng, Qi1; Liu, Fei2; He, Jianhua2; Shu, Heping2; Jia, Bing1 |
| 刊名 | CATENA
 |
| 出版日期 | 2018-03-01 |
| 卷号 | 162页码:193-202 |
| 关键词 | Atmospheric deposition Unsaturated zone Nitrate Circulation Mingsha sand dunes |
| ISSN号 | 0341-8162 |
| DOI | 10.1016/j.catena.2017.11.012 |
| 通讯作者 | Ma, Jinzhu(jzma@lzu.edu.cn) |
| 英文摘要 | The unsaturated zone is a significant feature of the nitrogen cycle in arid areas connecting atmospheric precipitation and surface water to groundwater. To measure NO3-, Cl-, and NH4+ concentrations, precipitation samples (39.9592 degrees N, 94.3302 degrees E) were collected at the western edge of the Mingsha sand dunes. Soil profiles were taken along the northern edge of the dunes to determine NO3- and Cl- concentrations and delta O-80-NO3- and delta N-15-NO3- levels in soil water. The mNO(3)(-)/Cl-, mNH(4)(+)/Cl- and NH4+-N/NO3--N values in precipitation showed seasonal variations, reflecting the influence of distinct anthropogenic sources. The delta N-15-NO3- and delta(ONO3-)-O-18 of the LT profile ranged from 2.38 to 7.84 parts per thousand and 14.72 to 57.5 parts per thousand, respectively, and that of GC profile ranged from - 1.36 to 2.35 parts per thousand and 5.07 to 21.3 parts per thousand, respectively. These results suggest that the main sources of vadose zone nitrogen in the profiles are NO3- fertilizer and NH4+ in fertilizer and precipitation, all of which are influenced by agricultural sources. Obvious nitrification and the mixing of different sources were noted, but the profiles showed no evidence of denitrification. The findings of this study show that migration of NO3- and Cl- in the desert vadose zone is influenced by heavy rainfall events, vegetation, and evaporation. Heavy rainfall events promote leaching of NO3- and Cl- into the deep vadose zone, while evaporation at the surface prevents leaching and vegetation hinders the downward migration of NO3- and Cl-. Migration of NO3--N and Cl-1 in sand dunes is affected by the solute gradient concentration difference of the soil water, moving from areas of higher concentrations to lower concentration. The NO3--N and Cl- accumulations were 1.02 kg N ha(-1) and 3.45 kg ha(-1), respectively, throughout autumn. These were larger than could be attributed to the input flux of atmospheric precipitation, especially in the near-surface soil layer, likely illustrating the influence of atmospheric dry deposition. |
| 收录类别 | SCI |
| WOS关键词 | WESTERN UNITED-STATES ; NITROGEN DEPOSITION ; TERRESTRIAL ECOSYSTEMS ; NITRATE CONCENTRATIONS ; GROUNDWATER RECHARGE ; SPECIES RICHNESS ; OXIDE EMISSIONS ; DESERT SOIL ; REGION ; CYCLE |
| WOS研究方向 | Geology ; Agriculture ; Water Resources |
| WOS类目 | Geosciences, Multidisciplinary ; Soil Science ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000423004800019 |
| 出版者 | ELSEVIER SCIENCE BV |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2558070 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Ma, Jinzhu |
| 作者单位 | 1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecohydrol Inland River Basin, Lanzhou 730000, Gansu, Peoples R China 2.Lanzhou Univ, Coll Earth & Environm Sci, Minist Educ, Key Lab Western Chinas Environm Syst, 222 South Tianshui Rd, Lanzhou 730000, Gansu, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qi, Shi,Ma, Jinzhu,Feng, Qi,et al. NO3- sources and circulation in the shallow vadose zone in the edge of Dunhuang Mingsha sand dunes in an extremely arid area of Northwestern China[J]. CATENA,2018,162:193-202. |
| APA | Qi, Shi.,Ma, Jinzhu.,Feng, Qi.,Liu, Fei.,He, Jianhua.,...&Jia, Bing.(2018).NO3- sources and circulation in the shallow vadose zone in the edge of Dunhuang Mingsha sand dunes in an extremely arid area of Northwestern China.CATENA,162,193-202. |
| MLA | Qi, Shi,et al."NO3- sources and circulation in the shallow vadose zone in the edge of Dunhuang Mingsha sand dunes in an extremely arid area of Northwestern China".CATENA 162(2018):193-202. |
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来源：寒区旱区环境与工程研究所
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