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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
Mihiranga, H. K. M.; Jiang, Yan; Sathsarani, M. G. S.; Li, Xuyong; Ritigala, Tharindu; Demissie, Hailu; Wang, Wei
2022-09-15
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
Volume839Issue:0Pages:156293
AbstractA 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.
Department城市与区域生态国家重点实验室 ; 城市与区域生态国家重点实验室
KeywordDISSOLVED ORGANIC NITROGEN RUNOFF GENERATION STORM EVENTS HYDROLOGICAL PROCESSES HYSTERESIS ANALYSIS NUTRIENT TRANSPORT HIGH-RESOLUTION CHEMICAL-DATA RIVER DYNAMICS
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/47278
Collection城市与区域生态国家重点实验室
Corresponding AuthorJiang, Yan
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Tea Res Inst, Agron Div, Talawakelle, Sri Lanka
4.Arba Minch Univ, Dept Chem, Arba Minch 1000, Ethiopia
Recommended Citation
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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