Identification of rainy season nitrogen export controls in a semi-arid mountainous watershed, North China
文献类型：期刊论文
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| 作者 | Mihiranga, H. K. M.; Jiang, Yan ; Sathsarani, M. G. S.; Li, Xuyong; Ritigala, Tharindu; Demissie, Hailu; Wang, Wei
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| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
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| 出版日期 | 2022-09-15 |
| 卷号 | 839期号:0页码:156293 |
| ISSN号 | 0048-9697 |
| 关键词 | DISSOLVED ORGANIC NITROGEN RUNOFF GENERATION STORM EVENTS HYDROLOGICAL PROCESSES HYSTERESIS ANALYSIS NUTRIENT TRANSPORT HIGH-RESOLUTION CHEMICAL-DATA RIVER DYNAMICS |
| 英文摘要 | A comprehensive understanding of the nutrient export process and export controls is demanded effective pollution mitigation in fragile riverine ecosystems. In this study, behaviors of the full range of nitrogen (N) under stormflow (5-events) and baseflow (2-events; before and after the rainy season, multiple sites) were assessed to explore N export controlling mechanisms according to the identified main components causing the changes in N exports, N transport pathways, seasonal trends, and nutrient supply watershed regions through the 2020 rainy season in a semi-arid mountainous watershed, northern China. Results showed increments in riverine dissolved organic-N (DON) and particulate N (PN) loadings as the leading cause of N flux and composition changes through the rainy season, although nitrate-N (NO3-N) contributed 69.6% of total-N (TN). Storm runoff generated 3-fold and 4-fold average increments in DON and PN fluxes. DON and PN shared 1-66% (18.1%) and 1-44% (9.7%) of TN through storms, registered consistency in behavior, mainly originated from near-stream soil, and were primarily transported by shallower subsurface flow. Our results broaden the understanding of PN delivery in catchment wetting-up periods by highlighting the decoupling of primary origins/transport pathways of PN from sediments. Results suggested hydrological functioning parallel to the catchment wetting-up as the principal governor of storm N evolution; soil moisture levels build up in the early rainy season, soil water runoff dominance during peak discharge fluctuations, groundwater runoff dominance at the end of the rainy season. Cumulative rainfall and antecedent soil moisture exerted more significant control over storm N exports than individual rainfall features. The assessment of N behaviors through river network disclosed watershed regions responsible for excessive N delivery and influences of unsustainable agriculture, sewage treatment work, and damming on natural riverine N fluxes. These findings could be useful references for the formulation of water pollution control strategies in the future. |
| 源URL | [https://ir.rcees.ac.cn/handle/311016/47278]  |
| 专题 | 生态环境研究中心_城市与区域生态国家重点实验室 |
| 通讯作者 | Jiang, Yan |
| 作者单位 | 1.Arba Minch Univ, Dept Chem, Arba Minch 1000, Ethiopia 2.Tea Res Inst, Agron Div, Talawakelle, Sri Lanka 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China |
| 推荐引用方式 GB/T 7714 | Mihiranga, H. K. M.,Jiang, Yan,Sathsarani, M. G. S.,et al. Identification of rainy season nitrogen export controls in a semi-arid mountainous watershed, North China, Identification of rainy season nitrogen export controls in a semi-arid mountainous watershed, North China.pdf[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2022,839(0):156293. |
| APA | Mihiranga, H. K. M..,Jiang, Yan.,Sathsarani, M. G. S..,Li, Xuyong.,Ritigala, Tharindu.,...&Wang, Wei.(2022).Identification of rainy season nitrogen export controls in a semi-arid mountainous watershed, North China.SCIENCE OF THE TOTAL ENVIRONMENT,839(0),156293. |
| MLA | Mihiranga, H. K. M.,et al."Identification of rainy season nitrogen export controls in a semi-arid mountainous watershed, North China".SCIENCE OF THE TOTAL ENVIRONMENT 839.0(2022):156293. |
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来源：生态环境研究中心
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